CN101290744B - Brightness compensation device and method for backlight module - Google Patents

Abstract

A brightness compensation device and method for a backlight module are disclosed. The invention uses the light sensing unit to sense the light source intensity of the backlight module, calculates the difference parameter according to the light source intensity and the preset brightness, and adjusts the gamma curve, the video data or the light source intensity of the backlight module according to the difference parameter, thereby reducing the influence of the backlight module on the display quality caused by the change condition of temperature or aging.

Description

Translated fromChinese

背光模块的亮度补偿装置与方法Brightness compensation device and method for backlight module

技术领域technical field

本发明涉及一种背光模块的亮度补偿装置，特别是涉及一种利用光感测技术来补偿背光模块的亮度。The invention relates to a brightness compensation device of a backlight module, in particular to a method for compensating the brightness of the backlight module by using light sensing technology.

背景技术Background technique

随着科技的进步，液晶显示器(Liquid Crystal Display，简称LCD)也日渐普及。然而液晶显示器会随着使用时间而老化，其中又以液晶显示器的背光模块尤其明显。有些背光模块主要是由发光二极管(Light-EmittingDiode，简称LED)来提供光源。发光二极管所发出的光强度会因为温度以及组件的老化而有所改变。为了使液晶显示器能够呈现稳定的亮度与色彩，因此随着背光模块的老化，必须针对背光模块的色彩与亮度进行补偿。With the advancement of technology, Liquid Crystal Display (LCD for short) is becoming more and more popular. However, the liquid crystal display will age with time, especially the backlight module of the liquid crystal display. Some backlight modules mainly use light-emitting diodes (Light-Emitting Diodes, referred to as LEDs) to provide light sources. The intensity of light emitted by LEDs will change due to temperature and aging of components. In order for the liquid crystal display to display stable brightness and color, it is necessary to compensate the color and brightness of the backlight module as the backlight module ages.

图1是已知的一种背光模块的亮度补偿装置的架构图，请参考图1。其中包括了电源转换器10、背光驱动单元20、发光二极管30、光感测单元40与控制单元50。其中电源转换器10用以提供背光驱动单元20所需的电压。背光驱动单元20用以提供发光二极管30所需的电压与电流。发光二极管30则依据电压与电流的变化产生相对应的光源强度。接着利用光感测单元40检测发光二极管30所发出光的强度并传送检测讯号给控制单元50。控制单元50则依据检测讯号调整背光驱动单元20以达到回馈调整发光二极管30。藉此实现背光模块的亮度补偿。FIG. 1 is a structural diagram of a known brightness compensation device for a backlight module, please refer to FIG. 1 . It includes apower converter 10 , abacklight driving unit 20 , alight emitting diode 30 , alight sensing unit 40 and acontrol unit 50 . Thepower converter 10 is used to provide the voltage required by thebacklight driving unit 20 . Thebacklight driving unit 20 is used to provide voltage and current required by theLED 30 . Thelight emitting diode 30 generates a corresponding light source intensity according to changes in voltage and current. Then, thelight sensing unit 40 is used to detect the intensity of the light emitted by theLED 30 and send a detection signal to thecontrol unit 50 . Thecontrol unit 50 adjusts thebacklight driving unit 20 according to the detection signal to achieve feedback adjustment of thelight emitting diodes 30 . In this way, the brightness compensation of the backlight module is realized.

此外，美国专利第6127783、6344641、6441558、6448550、6495964、6894442号也提出类似上述的作法，其不同之处在于驱动的时序、光感测单元40放置的位置、光传感器的种类等等。值得注意的是上述的作法皆由控制单元50依据光感测单元40所感测的亮度控制发光二极管30的亮度。不但需要额外花费成本增加控制单元50，调整发光二极管30的亮度的效果也相当有限。In addition, U.S. Patent Nos. 6,127,783, 6,344,641, 6,441,558, 6,448,550, 6,495,964, and 6,894,442 also propose a method similar to the above, the difference lies in the timing of driving, the location of thelight sensing unit 40, the type of light sensor, and so on. It should be noted that in the above methods, thecontrol unit 50 controls the brightness of theLED 30 according to the brightness sensed by thelight sensing unit 40 . Not only does it require extra cost to increase thecontrol unit 50, but the effect of adjusting the brightness of thelight emitting diode 30 is also quite limited.

有鉴于此，液晶显示器的相关制造商急于寻求适当的解决方式，以克服上述的问题。In view of this, relevant manufacturers of liquid crystal displays are eager to find a suitable solution to overcome the above-mentioned problems.

发明内容Contents of the invention

本发明提供一种背光模块的亮度补偿方法，藉由调整视讯数据补偿背光模块的发光二极管因老化或温度所造成的亮度或色彩的失真。The invention provides a brightness compensation method of a backlight module, which compensates the brightness or color distortion of the LED of the backlight module due to aging or temperature by adjusting video data.

本发明提供一种背光模块的亮度补偿装置，利用光感测单元感测背光模块的光源强度，进而求得背光模块的光源强度与预设亮度的差异参数，进而调整视讯数据以提升显示质量。The invention provides a brightness compensation device for a backlight module, which uses a light sensing unit to sense the light source intensity of the backlight module, and then obtains a difference parameter between the light source intensity of the backlight module and a preset brightness, and then adjusts video data to improve display quality.

本发明提出一种背光模块的亮度补偿方法，适用于显示装置呈现视讯数据，此亮度补偿方法包括下列步骤。感测背光模块的的光源强度。依据上述的光源强度与预设亮度计算差异参数。依据差异参数调整视讯数据。其中依据该光源强度与该预设亮度计算该差异参数的步骤还包括下列步骤：依据一红色光源强度与一红色预设亮度计算一红色差异参数；依据一绿色光源强度与一绿色预设亮度计算一绿色差异参数；以及依据一蓝色光源强度与一蓝色预设亮度计算一蓝色差异参数。其中计算该红色差异参数、该绿色差异参数、该蓝色差异参数的步骤还包括下列步骤：依据下列公式计算S₁、S₂与S₃，其中S₁、S₂与S₃分别为该红色差异参数、该绿色差异参数、该蓝色差异参数：The invention proposes a brightness compensation method for a backlight module, which is suitable for a display device to present video data. The brightness compensation method includes the following steps. Sensing the light source intensity of the backlight module. The difference parameter is calculated according to the above-mentioned light source intensity and preset brightness. Adjust the video data according to the difference parameter. The step of calculating the difference parameter based on the intensity of the light source and the preset brightness further includes the following steps: calculating a red difference parameter based on the intensity of a red light source and a preset brightness of red; calculating a parameter based on the intensity of a green light source and a preset brightness of green a green difference parameter; and a blue difference parameter calculated according to a blue light source intensity and a blue preset brightness. The step of calculating the red difference parameter, the green difference parameter, and the blue difference parameter further includes the following steps: calculating S₁ , S₂ and S₃ according to the following formula, wherein S₁ , S₂ and S₃ are the red Difference parameter, the green difference parameter, the blue difference parameter:

${\left[\begin{array}{ccc}<span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rr</span>rr</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rg</span>r\; g</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rb</span>rb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\\ <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gr</span>gr</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gg</span>gg</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gb</span>gb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\\ <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>br</span>br</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>bg</span>bg</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>bb</span>bb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\end{array}\right]}^{<span><span>-</span>-</span>\mathrm{<span><span>1</span>1</span>}}<span><span>\&times;</span>\&times;</span>$

$\left[\begin{array}{c}{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\\ {\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\\ {\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\end{array}\right]<span><span>=</span>=</span>\left[\begin{array}{ccc}{\mathrm{<span><span>S</span><figure-callout\; label="S"\; filenames="S071A0844320070427E000052.png"\; state="\{\{state\}\}">S</figure-callout></span>}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>& {\mathrm{<span><span>S</span>S</span>}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>,</span>,</span>& {\mathrm{<span><span>S</span>S</span>}}_{\mathrm{<span><span>3</span>3</span>}}\end{array}\right]<span><span>,</span>,</span>$

其中V_rr、V_gr、V_br分别为使用固定驱动电流不间断地驱动红色发光二极管时的红光传感器所感测到的所述红色光源强度、绿光传感器所感测到的所述绿色光源强度与蓝光传感器所感测到的所述蓝色光源强度；V_rg、V_gg、V_bg分别为使用固定驱动电流不间断地驱动绿色发光二极管时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_rb、V_gb、V_bb分别为使用固定驱动电流不间断地驱动蓝色发光二极管时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_m(R)、V_m(G)、V_m(B)分别为老化或温度变化时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_{r_dark}、V_{g_dark}、V_{b_dark}分别为当所述红色发光二极管、所述绿色发光二极管与所述蓝色发光二极管全部关掉时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；以及PWM(R)为预设的所述红色发光二极管的点亮时间除以所述红色发光二极管点亮的时间周期、PWM(G)为预设的所述绿色发光二极管的点亮时间除以所述绿色发光二极管点亮的时间周期、PWM(B)为预设的所述蓝色发光二极管的点亮时间除以所述蓝色发光二极管点亮的时间周期。Where V_rr , V_gr , V_br are respectively the intensity of the red light source sensed by the red light sensor, the intensity of the green light source sensed by the green light sensor and The intensity of the blue light source sensed by the blue light sensor; V_rg , V_gg , and V_bg are respectively the intensity of the red light source sensed by the red light sensor when the green light-emitting diode is continuously driven with a fixed driving current ,_the intensity of the green_light source sensed by the green light sensor and the_intensity of the blue light source sensed by the blue light sensor; The intensity of the red light source sensed by the red light sensor, the intensity of the green light source sensed by the green light sensor, and the intensity of the blue light source sensed by the blue light sensor; V_m (R), V_m (G), and V_m (B) are the intensity of the red light source sensed by the red light sensor and the intensity of the green light sensor sensed by the green light sensor during aging or temperature change, respectively. The intensity of the green light source and the intensity of the blue light source sensed by the blue light sensor; V_{r_dark} , V_{g_dark} , and V_{b_dark} are respectively the intensity of the red light source sensed by the red light sensor, the intensity of the green light source sensed by the green light sensor, and the intensity of the blue light source sensed by the blue light sensor when turned off; and PWM (R) is the preset lighting time of the red light emitting diode divided by the time period of the red light emitting diode lighting, PWM (G) is the preset lighting time of the green light emitting diode divided by the The time period during which the green light emitting diode is turned on, PWM (B) is the preset time period during which the blue light emitting diode is turned on divided by the time period during which the blue light emitting diode is turned on.

在本发明的一实施例中，上述的亮度补偿方法还包括依据所述红色差异参数调整一红色伽马曲线，依据所述绿色差异参数调整一绿色伽马曲线，以及依据所述蓝色差异参数调整一蓝色伽马曲线，所述红色、绿色和蓝色伽马曲线用以转换映像视讯数据的亮度。In an embodiment of the present invention, the above brightness compensation method further includes adjusting a red gamma curve according to the red difference parameter, adjusting a green gamma curve according to the green difference parameter, and adjusting a green gamma curve according to the blue difference parameter A blue gamma curve is adjusted, and the red, green and blue gamma curves are used to convert the brightness of the image video data.

本发明提出另一种背光模块的亮度补偿装置，适用于显示装置呈现视讯数据，此亮度补偿装置包括光感测单元、运算单元与校正单元。光感测单元用于感测背光模块的光源强度。运算单元耦接于光感测单元，此运算单元依据上述的光源强度与预设亮度计算差异参数。校正单元耦接于运算单元，此校正单元依据差异参数调整伽马曲线和/或视讯数据，此伽马曲线用以转换映像视讯数据的亮度。其中该光感测单元还包括：一红光传感器，用于感测以红光为主的光源强度，并输出一红色光源强度给该运算单元；一绿光传感器，用于感测以绿光为主的光源强度，并输出一绿色光源强度给该运算单元；以及一蓝光传感器，用于感测以蓝光为主的光源强度，并输出一蓝色光源强度给该运算单元。其中该运算单元依据该红色光源强度与一红色预设亮度计算一红色差异参数，该运算单元依据该绿色光源强度与一绿色预设亮度计算一绿色差异参数，该运算单元依据该蓝色光源强度与一蓝色预设亮度计算一蓝色差异参数。其中该运算单元依据下列公式计算S₁、S₂与S₃，其中S₁、S₂与S₃分别为该红色差异参数、该绿色差异参数、该蓝色差异参数：The present invention proposes another brightness compensation device for a backlight module, which is suitable for a display device to present video data. The brightness compensation device includes a light sensing unit, a computing unit, and a calibration unit. The light sensing unit is used for sensing the light source intensity of the backlight module. The computing unit is coupled to the light sensing unit, and the computing unit calculates the difference parameter according to the intensity of the light source and the preset brightness. The correction unit is coupled to the computing unit. The correction unit adjusts the gamma curve and/or the video data according to the difference parameter. The gamma curve is used to convert the brightness of the image video data. Wherein the light sensing unit also includes: a red light sensor, used to sense the intensity of the light source mainly composed of red light, and output a red light source intensity to the computing unit; a green light sensor, used to sense the intensity of the light source mainly composed of green light The main light source intensity, and output a green light source intensity to the computing unit; and a blue light sensor, used to sense the blue light-based light source intensity, and output a blue light source intensity to the computing unit. Wherein the calculation unit calculates a red difference parameter according to the intensity of the red light source and a red preset brightness, the calculation unit calculates a green difference parameter according to the intensity of the green light source and a green preset brightness, and the calculation unit calculates a green difference parameter according to the intensity of the blue light source A blue difference parameter is calculated with a blue preset brightness. The computing unit calculates S₁ , S₂ and S₃ according to the following formulas, wherein S₁ , S₂ and S₃ are the red difference parameter, the green difference parameter, and the blue difference parameter respectively:

${\left[\begin{array}{ccc}<span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rr</span>rr</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rg</span>r\; g</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rb</span>rb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\\ <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gr</span>gr</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gg</span>gg</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gb</span>gb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\\ <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>br</span>br</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>bg</span>bg</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>bb</span>bb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\end{array}\right]}^{<span><span>-</span>-</span>\mathrm{<span><span>1</span>1</span>}}<span><span>\&times;</span>\&times;</span>$

$\left[\begin{array}{c}{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\\ {\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\\ {\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\end{array}\right]<span><span>=</span>=</span>\left[\begin{array}{ccc}{\mathrm{<span><span>S</span><figure-callout\; label="S"\; filenames="S071A0844320070427E000052.png"\; state="\{\{state\}\}">S</figure-callout></span>}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>& {\mathrm{<span><span>S</span>S</span>}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>,</span>,</span>& {\mathrm{<span><span>S</span>S</span>}}_{\mathrm{<span><span>3</span>3</span>}}\end{array}\right]<span><span>,</span>,</span>$

其中V_rr、V_gr、V_br分别为使用固定驱动电流不间断地驱动红色发光二极管时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_rg、V_gg、V_bg分别为使用固定驱动电流不间断地驱动绿色发光二极管时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_rb、V_gb、V_bb分别为使用固定驱动电流不间断地驱动蓝色发光二极管时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_m(R)、V_m(G)、V_m(B)分别为老化或温度变化时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；V_{r_dark}、V_{g_dark}、V_{b_dark}分别为当所述红色发光二极管、所述绿色发光二极管与所述蓝色发光二极管全部关掉时的所述红光传感器所感测到的所述红色光源强度、所述绿光传感器所感测到的所述绿色光源强度与所述蓝光传感器所感测到的所述蓝色光源强度；以及PWM(R)为预设的所述红色发光二极管的点亮时间除以所述红色发光二极管点亮的时间周期、PWM(G)为预设的所述绿色发光二极管的点亮时间除以所述绿色发光二极管点亮的时间周期、PWM(B)为预设的所述蓝色发光二极管的点亮时间除以所述蓝色发光二极管点亮的时间周期。Wherein V_rr , V_gr , V_br are respectively the intensity of the red light source sensed by the red light sensor and the intensity of the green light sensor sensed by the red light sensor when the red light emitting diode is continuously driven by a fixed driving current. The intensity of the green light source and the intensity of the blue light source sensed by the blue light sensor; V_rg , V_gg , and V_bg are respectively sensed by the red light sensor when using a fixed drive current to continuously drive the green light emitting diode The intensity of the red light source, the intensity of the green light source sensed by the green light sensor, and the intensity of the blue light source sensed by the blue light sensor; V_rb , V_gb , and V_bb are respectively The intensity of the red light source sensed by the red light sensor, the intensity of the green light source sensed by the green light sensor and the intensity of the blue light sensor sensed by the blue light sensor when the current drives the blue light emitting diode continuously The intensity of the blue light source; V_m (R), V_m (G), and V_m (B) are respectively the intensity of the red light source and the green light sensed by the red light sensor when aging or temperature changes The intensity of the green light source sensed by the sensor and the intensity of the blue light source sensed by the blue light sensor; V_{r_dark} , V_{g_dark} , and V_{b_dark} are respectively The intensity of the red light source sensed by the red light sensor, the intensity of the green light source sensed by the green light sensor and the intensity of the light source sensed by the blue light sensor when all the blue light emitting diodes are turned off The intensity of the blue light source; and PWM (R) is the preset lighting time of the red light-emitting diode divided by the time period of the red light-emitting diode lighting, and PWM (G) is the preset lighting time of the green light-emitting diode The lighting time is divided by the lighting time period of the green light-emitting diode, and the PWM (B) is the preset lighting time of the blue light-emitting diode divided by the lighting time period of the blue light-emitting diode.

在本发明的一实施例中，上述的亮度补偿装置，其中校正单元还包括数据映像单元与伽马映像单元。数据映像单元耦接于运算单元，此数据映像单元依据所述红色差异参数、所述绿色差异参数和所述蓝色差异参数分别对视讯数据作相对应的调整。伽马映像单元耦接于数据映像单元，此伽马映像单元依据所述红色差异参数调整一红色伽马曲线，依据所述绿色差异参数调整一绿色伽马曲线，依据所述蓝色差异参数调整一蓝色伽马曲线。In an embodiment of the present invention, the above brightness compensation device, wherein the correction unit further includes a data mapping unit and a gamma mapping unit. The data mapping unit is coupled to the computing unit, and the data mapping unit makes corresponding adjustments to the video data according to the red difference parameter, the green difference parameter and the blue difference parameter respectively. The gamma mapping unit is coupled to the data mapping unit. The gamma mapping unit adjusts a red gamma curve according to the red difference parameter, adjusts a green gamma curve according to the green difference parameter, and adjusts a green gamma curve according to the blue difference parameter. A blue gamma curve.

在本发明的一实施例中，上述的亮度补偿装置，其中光感测单元还包括讯号转换单元。讯号转换单元耦接于运算单元、所述红光传感器、所述绿光传感器与所述蓝光传感器之间，此讯号转换单元接收来自所述红光传感器、所述绿光传感器与所述蓝光传感器所输出而成的一电性讯号，此讯号转换单元用以将所述电性讯号转换成数字讯号，以提供给运算单元。In an embodiment of the present invention, in the above brightness compensation device, the light sensing unit further includes a signal conversion unit. The signal conversion unit is coupled between the computing unit, the red light sensor, the green light sensor and the blue light sensor, and the signal conversion unit receives signals from the red light sensor, the green light sensor and the blue light sensor An electrical signal is outputted, and the signal conversion unit is used to convert the electrical signal into a digital signal to provide to the computing unit.

本发明因利用光感测单元感测背光模块的光源强度，并依据上述的光源强度与预设亮度计算差异参数，再依据差异参数调整伽马曲线和/或视讯数据，藉以减少背光模块因温度或老化而造成的亮度失真。In the present invention, the light sensing unit is used to sense the light source intensity of the backlight module, and the difference parameter is calculated according to the above-mentioned light source intensity and preset brightness, and then the gamma curve and/or video data are adjusted according to the difference parameter, so as to reduce the temperature of the backlight module. Or brightness distortion caused by aging.

为使本发明的上述特征和优点能更明显易懂，下文特举较佳实施例，并结合附图详细说明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings.

 附图说明Description of drawings

图1是已知的一种背光模块的亮度补偿装置的架构图。FIG. 1 is a structural diagram of a known brightness compensation device for a backlight module.

图2A是依照本发明的第一实施例的一种背光模块的亮度补偿装置架构图。FIG. 2A is a structural diagram of a brightness compensation device for a backlight module according to the first embodiment of the present invention.

图2B是依照本发明的第一实施例的一种背光模块的亮度补偿方法流程图。FIG. 2B is a flowchart of a brightness compensation method for a backlight module according to the first embodiment of the present invention.

图3是依照本发明的第二实施例的一种背光模块的亮度补偿装置架构图。FIG. 3 is a structural diagram of a brightness compensation device for a backlight module according to a second embodiment of the present invention.

图4是依照本发明的第三实施例的一种背光模块的亮度补偿装置架构图。FIG. 4 is a structural diagram of a brightness compensation device for a backlight module according to a third embodiment of the present invention.

图5是依照本发明的第四实施例的一种背光模块的亮度补偿装置架构图。FIG. 5 is a structural diagram of a brightness compensation device for a backlight module according to a fourth embodiment of the present invention.

图6是依照本发明的第五实施例的一种背光模块的亮度补偿装置架构图。FIG. 6 is a structural diagram of a brightness compensation device for a backlight module according to a fifth embodiment of the present invention.

图7是依照本发明的第六实施例的一种背光模块的亮度补偿装置架构图。FIG. 7 is a structural diagram of a brightness compensation device for a backlight module according to a sixth embodiment of the present invention.

图8是依照本发明的第七实施例的一种背光模块的亮度补偿装置架构图。FIG. 8 is a structural diagram of a brightness compensation device for a backlight module according to a seventh embodiment of the present invention.

附图符号说明Description of reference symbols

10：电源转换器10: Power converter

20：背光驱动单元20: Backlight drive unit

30：发光二极管30: LED

31：背光模块31: Backlight module

40、41、42、43：光感测单元40, 41, 42, 43: light sensing unit

50：控制单元50: Control unit

51：运算单元51: Operation unit

61、62：校正单元61, 62: Correction unit

70：传感器70: sensor

71：红光传感器71: Red light sensor

72：绿光传感器72: Green light sensor

73：蓝光传感器73: Blue light sensor

80：讯号转换单元80: Signal conversion unit

91：数据映像单元91: Data image unit

92：伽马映像单元92: Gamma mapping unit

93：时序控制器93: Timing controller

94：显示器驱动线路94: Display drive circuit

101：基板101: Substrate

S201～S203：是图2B流程图的各步骤S201～S203: are the steps of the flow chart in Figure 2B

具体实施方式Detailed ways

图2A是依照本发明的第一实施例的一种背光模块的亮度补偿装置架构图，图2B是依照本发明的第一实施例的一种背光模块的亮度补偿方法流程图，请参考图2A与图2B。亮度补偿装置包括了光感测单元41、运算单元51、校正单元61，此亮度补偿装置适用以补偿显示装置的背光模块31的亮度。背光模块31的背光源则依据电压与电流发出相对应的光线。另外，在此实施例，背光模块31的背光源特别以红绿蓝(Red Green Blue，简称RGB)的发光二极管作为例子来说明本实施例。本领域的技术人员应当了解，本实施例所举例的「RGB的发光二极管」仅是一特定实施例，在另一实施例中，背光模块31的背光源仍可以使用冷阴极灯管、白光的发光二极管搭配滤光片来混色或是使用其它形式的点光源、线光源、面光源等等...，故本发明不应当限定于此种特定实施例。Fig. 2A is a structural diagram of a brightness compensation device for a backlight module according to the first embodiment of the present invention, and Fig. 2B is a flow chart of a brightness compensation method for a backlight module according to the first embodiment of the present invention, please refer to Fig. 2A with Figure 2B. The brightness compensation device includes alight sensing unit 41 , acomputing unit 51 , and acorrection unit 61 . The brightness compensation device is suitable for compensating the brightness of thebacklight module 31 of the display device. The backlight source of thebacklight module 31 emits corresponding light according to the voltage and current. In addition, in this embodiment, the backlight source of thebacklight module 31 is particularly described by taking a red green blue (RGB) light emitting diode as an example to illustrate this embodiment. Those skilled in the art should understand that the "RGB LED" mentioned in this embodiment is only a specific embodiment. In another embodiment, the backlight of thebacklight module 31 can still use cold cathode lamps, white light The light-emitting diodes are combined with filters to mix colors or use other forms of point light sources, line light sources, surface light sources, etc., so the present invention should not be limited to this specific embodiment.

接着由步骤S201，光感测单元41感测背光模块31的光源强度。接着执行步骤S202，由运算单元51依据上述感测的光源强度与预设亮度计算差异参数。在此提及的预设亮度为背光模块31应当输出的的理想期望亮度。最后再执行步骤S203，由校正单元61依据差异参数调整视讯数据和/或伽马曲线，其中伽马曲线用以转换映像视讯数据的亮度。如此作法，不但可以补偿背光模块31因温度或老化所造成的亮度失真，还可减少色彩的失真。本实施例所述的校正单元61依据差异参数调整伽马曲线，本领域的技术人员也可依其需求改变实施方式，例如预设定多条伽马曲线，校正单元61则依据差异参数选用伽马曲线。Next, in step S201 , thelight sensing unit 41 senses the intensity of the light source of thebacklight module 31 . Next, step S202 is executed, and thecalculation unit 51 calculates a difference parameter according to the sensed light source intensity and the preset brightness. The preset brightness mentioned here is the ideal expected brightness that thebacklight module 31 should output. Finally, step S203 is executed again, and thecorrection unit 61 adjusts the video data and/or the gamma curve according to the difference parameter, wherein the gamma curve is used to convert the brightness of the image video data. In this way, not only the brightness distortion caused by the temperature or aging of thebacklight module 31 can be compensated, but also the color distortion can be reduced. Thecorrection unit 61 described in this embodiment adjusts the gamma curve according to the difference parameter. Those skilled in the art can also change the implementation according to their needs, for example, preset multiple gamma curves, and thecorrection unit 61 selects the gamma curve according to the difference parameter Horse curves.

图3是依照本发明的第二实施例的一种背光模块的亮度补偿装置架构图，请参考图3。在此实施例中，亮度补偿装置包括光感测单元42、运算单元51与校正单元61。其中运算单元51与校正单元61与上述实施例相同，在此不再赘述。值得注意的是光感测单元42。在本实施例中，光感测单元42包括了传感器70与讯号转换单元80。传感器70用以感测背光模块31的光源强度并输出电性讯号。在本实施例中，传感器70所输出的电性讯号为模拟讯号，例如是电压或电流。FIG. 3 is a structural diagram of a brightness compensation device for a backlight module according to a second embodiment of the present invention, please refer to FIG. 3 . In this embodiment, the brightness compensation device includes alight sensing unit 42 , anarithmetic unit 51 and acorrection unit 61 . Thecalculation unit 51 and thecorrection unit 61 are the same as those of the above-mentioned embodiments, and will not be repeated here. Noteworthy is thelight sensing unit 42 . In this embodiment, thelight sensing unit 42 includes asensor 70 and asignal conversion unit 80 . Thesensor 70 is used for sensing the intensity of the light source of thebacklight module 31 and outputting an electrical signal. In this embodiment, the electrical signal output by thesensor 70 is an analog signal, such as voltage or current.

传感器70可依照不同实施例而有不一样的型态，例如传感器70可为光二极管(Photodiode)、光色彩传感器(Color Sensor)或周边光传感器(Ambient Light Sensor，简称ALS)等等，换言之，传感器70泛指具有检测光的功能的感光组件。Thesensor 70 can have different types according to different embodiments, for example, thesensor 70 can be a photodiode (Photodiode), a light color sensor (Color Sensor) or an ambient light sensor (Ambient Light Sensor, referred to as ALS), etc. In other words, Thesensor 70 generally refers to a photosensitive component having a function of detecting light.

讯号转换单元80耦接于运算单元51与传感器70之间。讯号转换单元80与传感器70之间可利用序列传输接口(Serial Peripheral Interface，SPI)或是集成电路间(Inter-Integrated Circu it，IIC)接口来传输数据。而讯号转换单元80则用以转换传感器70所提供的电性讯号，例如在本实施例中讯号转换单元80将传感器70所提供的模拟讯号(电压或电流)转为数字讯号。不仅如此，讯号转换单元80还可依其需求调整取样频率。接着再由讯号转换单元80将数字讯号传送给运算单元51。运算单元51接着依据数字讯号与预设亮度计算差异参数，再由校正单元61依据差异参数调整伽马曲线和/或视讯数据，如此作法，不但可以补偿背光模块31因温度或老化所造成的亮度失真，还可减少色彩的失真。Thesignal converting unit 80 is coupled between thecomputing unit 51 and thesensor 70 . A serial transmission interface (Serial Peripheral Interface, SPI) or an inter-integrated circuit (Inter-Integrated Circuit, IIC) interface can be used to transmit data between thesignal converting unit 80 and thesensor 70 . Thesignal conversion unit 80 is used to convert the electrical signal provided by thesensor 70 , for example, in this embodiment, thesignal conversion unit 80 converts the analog signal (voltage or current) provided by thesensor 70 into a digital signal. Not only that, thesignal conversion unit 80 can also adjust the sampling frequency according to its requirement. Then thesignal conversion unit 80 sends the digital signal to thecomputing unit 51 . Thecalculation unit 51 then calculates the difference parameter according to the digital signal and the preset brightness, and then thecorrection unit 61 adjusts the gamma curve and/or video data according to the difference parameter. In this way, not only the brightness of thebacklight module 31 caused by temperature or aging can be compensated Distortion, but also reduce color distortion.

上述实施例中传感器70所输出的电性讯号虽以模拟讯号为例，但在其它实施例中，传感器70也可直接输出数字讯号。如此一来，传感器70则可直接提供给运算单元51进行运算。此外，讯号转换单元80也并非仅能将模拟讯号转为数字讯号，例如在特殊实施例当中，讯号转换单元80也可将电压讯号转为电流讯号或是将电流讯号转为电压讯号。因此，本领域的技术人员可依据其需求而决定讯号转换单元80所转换的讯号类型。Although the electrical signal output by thesensor 70 in the above embodiments is an analog signal, in other embodiments, thesensor 70 can also directly output a digital signal. In this way, thesensor 70 can be directly provided to thecalculation unit 51 for calculation. In addition, thesignal conversion unit 80 is not only capable of converting analog signals into digital signals. For example, in a special embodiment, thesignal conversion unit 80 can also convert voltage signals into current signals or convert current signals into voltage signals. Therefore, those skilled in the art can determine the type of signal converted by thesignal conversion unit 80 according to their requirements.

图4是依照本发明的第三实施例的一种背光模块的亮度补偿装置架构图，请参考图4。在本实施例中，亮度补偿装置包括光感测单元41、运算单元51与校正单元62。其中光感测单元41与运算单元51与上述实施例相同，在此不再赘述。值得注意的是校正单元62。在本实施例中，校正单元62包括了数据映像单元91与伽马映像单元92。数据映像单元91耦接于运算单元51，此数据映像单元91依据运算单元51所计算的差异参数调整视讯数据。数据映像单元91例如是以数字转数字(Digital to Digital)的方式调整视讯数据。更具体地说，校正单元62可以依据差异参数提供数字化的动态伽马曲线给数据映像单元91。数据映像单元91则以内存映像(MemoryMapping)的伽马曲线调整视讯数据的亮度。FIG. 4 is a structural diagram of a brightness compensation device for a backlight module according to a third embodiment of the present invention, please refer to FIG. 4 . In this embodiment, the brightness compensation device includes alight sensing unit 41 , anarithmetic unit 51 and acorrection unit 62 . The photo-sensingunit 41 and thecomputing unit 51 are the same as those of the above-mentioned embodiments, and will not be repeated here. Of note is thecorrection unit 62 . In this embodiment, thecalibration unit 62 includes adata mapping unit 91 and agamma mapping unit 92 . Thedata mapping unit 91 is coupled to thecomputing unit 51 , and thedata mapping unit 91 adjusts the video data according to the difference parameter calculated by thecomputing unit 51 . Thedata mapping unit 91 adjusts the video data in a digital to digital (Digital to Digital) manner, for example. More specifically, thecalibration unit 62 can provide the digitized dynamic gamma curve to thedata mapping unit 91 according to the difference parameter. Thedata mapping unit 91 adjusts the brightness of the video data with the gamma curve of memory mapping.

伽马映像单元92耦接于数据映像单元91。值得注意的是，伽马映像单元92同样可依据差异参数调整伽马曲线。更具体的说，伽马映像单元92例如可以预设多条伽马曲线，并依据差异参数而选用不同的伽马曲线，藉以调整视讯数据的亮度。值得一提的是，本实施例虽然同时使用数据映像单元91与伽马映像单元92来调整视讯数据的亮度。但在另一实施例中，校正单元62接收运算单元51计算的差异参数后，也可只利用数据映像单元91与伽马映像单元92其中之一来调整视讯数据。如此作法，不但可以补偿背光模块31因温度或老化所造成的亮度失真，还可减少色彩的失真。Thegamma mapping unit 92 is coupled to thedata mapping unit 91 . It should be noted that thegamma mapping unit 92 can also adjust the gamma curve according to the difference parameter. More specifically, thegamma mapping unit 92 can preset multiple gamma curves, and select different gamma curves according to the difference parameters, so as to adjust the brightness of the video data. It is worth mentioning that although the present embodiment uses thedata mapping unit 91 and thegamma mapping unit 92 to adjust the brightness of the video data. However, in another embodiment, after thecorrection unit 62 receives the difference parameter calculated by thecalculation unit 51 , only one of thedata mapping unit 91 and thegamma mapping unit 92 can be used to adjust the video data. In this way, not only the brightness distortion caused by the temperature or aging of thebacklight module 31 can be compensated, but also the color distortion can be reduced.

图5是依照本发明的第四实施例的一种背光模块的亮度补偿装置架构图，请参考图5。图5中的背光模块31、光感测单元41、运算单元51、校正单元62、数据映像单元91与伽马映像单元92与上述实施例相同，在此不再赘述。在本实施例中，校正单元62依据差异参数调整完视讯数据后，校正单元62将调整后的视讯数据传送给时序控制器(Timing Controller orTiming Generator)93。时序控制器93用来产生显示装置的各个驱动线路所需的控制讯号与数据讯号。换言之，将校正单元62配置于时序控制器93的前，时序控制器93即可依据调整后的视讯数据输出控制讯号与调整后的视讯数据给显示器驱动线路94。显示器驱动线路94则用以驱动显示装置呈现调整后的视讯数据，如此即可补偿背光模块31的亮度失真。本实施例中显示器驱动线路94泛指源极驱动电路(Source Driver IntegratedCircuit)、栅极驱动电路(Gate Driver Integrated Circuit)与其相关的应用线路。FIG. 5 is a structural diagram of a brightness compensation device for a backlight module according to a fourth embodiment of the present invention, please refer to FIG. 5 . Thebacklight module 31 , thelight sensing unit 41 , thecomputing unit 51 , thecalibration unit 62 , thedata mapping unit 91 and thegamma mapping unit 92 in FIG. 5 are the same as those of the above-mentioned embodiments, and will not be repeated here. In this embodiment, after thecorrection unit 62 adjusts the video data according to the difference parameter, thecorrection unit 62 sends the adjusted video data to a timing controller (Timing Controller or Timing Generator) 93. The timing controller 93 is used to generate control signals and data signals required by each driving circuit of the display device. In other words, by disposing thecalibration unit 62 in front of the timing controller 93 , the timing controller 93 can output the control signal and the adjusted video data to the display driving circuit 94 according to the adjusted video data. The display driving circuit 94 is used to drive the display device to present the adjusted video data, so that the brightness distortion of thebacklight module 31 can be compensated. In this embodiment, the display driving circuit 94 generally refers to a source driver integrated circuit (Source Driver Integrated Circuit), a gate driver integrated circuit (Gate Driver Integrated Circuit) and related application circuits.

如上上述，本领域的技术人员也可视其需求，而依据本发明的精神与前述诸实施例的教示改变实施方式。例如在另一实施例中，校正单元62也可配置于时序控制器93的后。换言之可将校正单元62整合于显示器驱动线路94的中，例如将数据映像单元91整合于源极驱动电路中。又例如将伽马映像单元92整合于源极驱动电路中等等...。此作法的好处在于不需额外增设新的硬件架构，利用现有的显示装置架构，即可补偿背光模块31因温度或老化所造成的亮度与色彩的失真，大幅地降低了硬件成本。As mentioned above, those skilled in the art can also change the implementation according to the spirit of the present invention and the teachings of the foregoing embodiments according to their needs. For example, in another embodiment, thecalibration unit 62 may also be disposed after the timing controller 93 . In other words, thecorrection unit 62 can be integrated in the display driving circuit 94 , for example, thedata mapping unit 91 can be integrated in the source driving circuit. Another example is to integrate thegamma mapping unit 92 into the source driving circuit, etc. . . . The advantage of this approach is that it does not need to add a new hardware structure, and the existing display device structure can be used to compensate the brightness and color distortion of thebacklight module 31 caused by temperature or aging, which greatly reduces the hardware cost.

图6是依照本发明的第五实施例的一种背光模块的亮度补偿装置架构图，请参考图6。在本实施例中，亮度补偿装置包括了光感测单元43、运算单元51与校正单元61。光感测单元43包括了红光传感器71、绿光传感器72、蓝光传感器73与讯号转换单元80。其中运算单元51、校正单元61与讯号转换单元80可参照上述诸实施例，在此不再赘述。值得注意的是红光传感器71、绿光传感器72与蓝光传感器73。红光传感器71用于感测背光模块31的中以红光为主的光源强度，并通过讯号转换单元80输出红色光源强度给运算单元51。绿光传感器72用于感测背光模块31的中以绿光为主的光源强度，并通过讯号转换单元80输出绿色光源强度给运算单元51。蓝光传感器73用于感测背光模块31的中以蓝光为主的光源强度，并通过讯号转换单元80输出蓝色光源强度给运算单元51。FIG. 6 is a structural diagram of a brightness compensation device for a backlight module according to a fifth embodiment of the present invention, please refer to FIG. 6 . In this embodiment, the brightness compensation device includes alight sensing unit 43 , anarithmetic unit 51 and acorrection unit 61 . Thelight sensing unit 43 includes ared light sensor 71 , agreen light sensor 72 , a bluelight sensor 73 and asignal conversion unit 80 . Thecalculation unit 51 , thecorrection unit 61 and thesignal conversion unit 80 can refer to the above-mentioned embodiments, and will not be repeated here. Noteworthy are thered light sensor 71 , thegreen light sensor 72 and the bluelight sensor 73 . Thered light sensor 71 is used for sensing the intensity of the red light mainly in thebacklight module 31 , and outputs the intensity of the red light source to thecomputing unit 51 through thesignal converting unit 80 . Thegreen light sensor 72 is used to sense the intensity of the green light in thebacklight module 31 , and output the intensity of the green light to thecomputing unit 51 through thesignal converting unit 80 . The bluelight sensor 73 is used to sense the intensity of the light source mainly blue light in thebacklight module 31 , and output the intensity of the blue light source to thecomputing unit 51 through thesignal converting unit 80 .

如上所述，利用下列公式(1)、(2)可推得公式(3)。运算单元51再依据下列公式(3)计算红色差异参数、绿色差异参数与蓝色差异参数，公式(1)～(3)的说明可参照下列表一。As described above, formula (3) can be derived using the following formulas (1), (2). Thecomputing unit 51 then calculates the red difference parameter, the green difference parameter and the blue difference parameter according to the following formula (3). For the description of the formulas (1)-(3), please refer to the following Table 1.

 V(R)，V(G)，V(B)预设的红光传感器71所感测到的红色光源强度、绿光传感器72所感测到的绿色光源强度与蓝光传感器73所感测到的蓝色光源强度。V_m(R)，V_m(G)，V_m(B)老化或温度变化等因素产生后，此时红光传感器71所  感测到的红色光源强度、绿光传感器72所感测到的绿  色光源强度与蓝光传感器73所感测到的蓝色光源强度。V_rr，V_gr，V_br使用固定驱动电流不间断的驱动红色发光二极管，此时红光传感器71所感测到的红色光源强度、绿光传感器  72所感测到的绿色光源强度与蓝光传感器73所感测到  的蓝色光源强度。V_rg，V_gg，V_bg使用固定驱动电流不间断的驱动绿色发光二极管，此时红光传感器71所感测到的红色光源强度、绿光传感器  72所感测到的绿色光源强度与蓝光传感器73所感测到 V(R), V(G), V(B) The intensity of the red light source sensed by thered light sensor 71 , the intensity of the green light source sensed by thegreen light sensor 72 , and the intensity of the blue light source sensed by the bluelight sensor 73 are preset. V_m(R), V_m(G), V_m(B) After factors such as aging or temperature change occur, the intensity of the red light source sensed by thered light sensor 71, the intensity of the green light source sensed by thegreen light sensor 72, and the intensity of the blue light source sensed by the bluelight sensor 73. V_rr, V_gr, V_br Using a fixed driving current to continuously drive the red light emitting diode, the intensity of the red light source sensed by thered light sensor 71, the intensity of the green light source sensed by thegreen light sensor 72 and the intensity of the blue light source sensed by the bluelight sensor 73. V_rg, V_gg, V_bg Use a fixed drive current to continuously drive the green light emitting diode. At this time, the intensity of the red light source sensed by thered light sensor 71, the intensity of the green light source sensed by thegreen light sensor 72 and the intensity sensed by the bluelight sensor 73

[0057] 的蓝色光源强度。V_rb，V_gb，V_bb使用固定驱动电流不间断的驱动蓝色发光二极管，此时红光传感器71所感测到的红色光源强度、绿光传感器  72所感测到的绿色光源强度与蓝光传感器73所感测到  的蓝色光源强度。V_{r_dark}，V_g-dark，V_{b_dark}当红色发光二极管、绿色发光二极管与蓝色发光二极管全部关掉时，此时红光传感器71所感测到的红色光源  强度、绿光传感器72所感测到的绿色光源强度与蓝光  传感器73所感测到的蓝色光源强度。PWM(R)预设的红色发光二极管的点亮时间/红色发光二极管点亮的时间周期PWM(G)预设的绿色发光二极管的点亮时间/绿色发光二极管点亮的时间周期PWM(B)预设的蓝色发光二极管的点亮时间/蓝色发光二极管点亮的时间周期S₁红色差异参数S₂绿色差异参数S₃蓝色差异参数[0057] The intensity of the blue light source. V_rb, V_gb, V_bb Use a fixed driving current to continuously drive the blue light emitting diode. At this time, the intensity of the red light source sensed by thered light sensor 71, the intensity of the green light source sensed by thegreen light sensor 72, and the intensity of the blue light source sensed by the bluelight sensor 73 . V_{r_dark}, V_g-dark, V_{b_dark} When the red light emitting diode, green light emitting diode and blue light emitting diode are all turned off, the intensity of the red light source sensed by thered light sensor 71, the intensity of the green light source sensed by thegreen light sensor 72 and the intensity sensed by the bluelight sensor 73 The intensity of the blue light source. PWM(R) The preset lighting time of the red LED / the time period of the red LED lighting PWM(G) The preset lighting time of the green LED / the time period of the green LED lighting PWM(B) The preset lighting time of the blue LED / the time period of the blue LED lighting S₁ red difference parameter S₂ Green Difference Parameters S₃ blue difference parameter

表一：公式(1)～(3)的说明Table 1: Explanation of formulas (1) to (3)

V(R)＝(V_rr-V_{r_dark})*PWM(R)+(V_rg-V_{r_dark})*PWM(G)+V(R)＝(V_rr -V_{r_dark} )*PWM(R)+(V_rg -V_{r_dark} )*PWM(G)+

(V_rb-V_{r_dark})*PWM(B)+V_{r_dark}(V_rb -V_{r_dark} )*PWM(B)+V_{r_dark}

V(G)＝(V_gr-V_{g_dark})*PWM(R)+(V_gg-V_{g_dark})*PWM(G)+V(G)＝(V_gr -V_{g_dark} )*PWM(R)+(V_gg -V_{g_dark} )*PWM(G)+

(V_gb-V_{g_dark})*PWM(B)+V_{g_dark}(V_gb -V_{g_dark} )*PWM(B)+V_{g_dark}

V(B)＝(V_br-V_{b_dark})*PWM(R)+(V_bg-V_{b_dark})*PWM(G)+V(B)＝(V_br -V_{b_dark} )*PWM(R)+(V_bg -V_{b_dark} )*PWM(G)+

(V_bb-V_{b_dark})*PWM(B)+V_{b_dark}(V_bb -V_{b_dark} )*PWM(B)+V_{b_dark}

...公式(1)...Formula 1)

V_m(R)＝S₁(V_rr-V_{r_dark})*PWM(R)+S₂(V_rg-V_{r_dark})*PWM(G)+V_m (R)＝S₁ (V_rr -V_{r_dark} )*PWM(R)+S₂ (V_rg -V_{r_dark} )*PWM(G)+

S₃(V_rb-V_{r_dark})*PWM(B)+V_{r_dark}S₃ (V_rb -V_{r_dark} )*PWM(B)+V_{r_dark}

V_m(R)＝S₁(V_gr-V_{g_dark})*PWM(R)+S₂(V_gg-V_{g_dark})*PWM(G)+V_m (R)＝S₁ (V_gr -V_{g_dark} )*PWM(R)+S₂ (V_gg -V_{g_dark} )*PWM(G)+

S₃(V_gb-V_{g_dark})*PWM(B)+V_{g_dark}S₃ (V_gb -V_{g_dark} )*PWM(B)+V_{g_dark}

V_m(R)＝S₁(V_br-V_{b_dark})*PWM(R)+S₂(V_bg-V_{b_dark})*PWM(G)+V_m (R)＝S₁ (V_br -V_{b_dark} )*PWM(R)+S₂ (V_bg -V_{b_dark} )*PWM(G)+

S₃(V_bb-V_{b_dark})*PWM(B)+V_{b_dark}S₃ (V_bb -V_{b_dark} )*PWM(B)+V_{b_dark}

...公式(2)...formula (2)

${\left[\begin{array}{ccc}<span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rr</span>rr</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rg</span>r\; g</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>rb</span>rb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\\ <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gr</span>gr</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gg</span>gg</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>gb</span>gb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\\ <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>br</span>br</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>bg</span>bg</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>,</span>,</span>& <span><span>(</span>(</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>bb</span>bb</span>}}<span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}<span><span>)</span>)</span>\mathrm{<span><span>PWM</span>PWM</span>}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span>\end{array}\right]}^{<span><span>-</span>-</span>\mathrm{<span><span>1</span>1</span>}}<span><span>\&times;</span>\&times;</span>$

$\left[\begin{array}{c}{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>R</span>R</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>r</span>r</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\\ {\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>G</span>G</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>g</span>g</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\\ {\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>m</span>m</span>}}<span><span>(</span>(</span>\mathrm{<span><span>B</span>B</span>}<span><span>)</span>)</span><span><span>-</span>-</span>{\mathrm{<span><span>V</span>V</span>}}_{\mathrm{<span><span>b</span>b</span>}<span><span>\_</span>\_</span>\mathrm{<span><span>dark</span>dark</span>}}\end{array}\right]<span><span>=</span>=</span>\left[\begin{array}{ccc}{\mathrm{<span><span>S</span><figure-callout\; label="S"\; filenames="S071A0844320070427E000052.png"\; state="\{\{state\}\}">S</figure-callout></span>}}_{\mathrm{<span><span>1</span>1</span>}}<span><span>,</span>,</span>& {\mathrm{<span><span>S</span>S</span>}}_{\mathrm{<span><span>2</span>2</span>}}<span><span>,</span>,</span>& {\mathrm{<span><span>S</span>S</span>}}_{\mathrm{<span><span>3</span>3</span>}}\end{array}\right]$

...公式(3)...formula (3)

接着校正单元61再依据红色差异参数、绿色差异参数与蓝色差异参数分别对红色、绿色与蓝色的伽马曲线或视讯数据作相对应的调整即可补偿背光模块31因温度或老化所造成的亮度与色彩的失真。Then thecalibration unit 61 makes corresponding adjustments to the red, green and blue gamma curves or video data according to the red difference parameter, the green difference parameter and the blue difference parameter, so as to compensate thebacklight module 31 caused by temperature or aging. brightness and color distortion.

本领域的技术人员也可视其需求，而依据本发明的精神与前述诸实施例的教示将红色传感器71、绿色传感器72与蓝色传感器73改成其它颜色或数量的传感器，再适当调整计算各颜色的差异参数的公式，如此也可实现补偿背光模块因温度或老化所造成的亮度与色彩的失真，在此则不予赘述。如此作法的好处在于可针对不同颜色的光源进行亮度补偿，可随着不同颜色的光源因老化速度不同而进行适当的亮度补偿。此外，在另一实施例中，也可将上述实施例的红色传感器71、绿色传感器72与蓝色传感器73整合在一个光色彩传感器藉以节省空间，并降低硬件成本。Those skilled in the art may also change thered sensor 71, thegreen sensor 72 and theblue sensor 73 into sensors of other colors or quantities according to the spirit of the present invention and the teachings of the aforementioned embodiments, and then adjust the calculation appropriately. The formula of the difference parameter of each color can also realize the compensation of the brightness and color distortion of the backlight module caused by temperature or aging in this way, so it will not be repeated here. The advantage of this method is that brightness compensation can be performed for different color light sources, and appropriate brightness compensation can be performed according to different color light sources due to different aging speeds. In addition, in another embodiment, thered sensor 71 , thegreen sensor 72 and theblue sensor 73 of the above embodiments can also be integrated into one light color sensor to save space and reduce hardware costs.

图7是依照本发明的第六实施例的一种背光模块的亮度补偿装置架构图，请参考图7。在本实施例中，背光模块31、光感测单元41、运算单元51与校正单元61可参考上述诸实施例，在此不予赘述。值得注意的是，在本实施例中，运算单元51计算出差异参数后，运算单元51会将差异参数输出给校正单元61与背光模块31。不仅校正单元61可依据差异参数来进行亮度补偿，背光模块31也可依据差异参数进行亮度补偿。如此作法的好处在于可同时利用校正单元61与背光模块31进行双重亮度补偿，让背光模块因温度与老化所造成的亮度失真的亮度补偿更具有弹性调整。FIG. 7 is a structural diagram of a brightness compensation device for a backlight module according to a sixth embodiment of the present invention, please refer to FIG. 7 . In this embodiment, thebacklight module 31 , the photo-sensingunit 41 , thecomputing unit 51 and thecalibration unit 61 can refer to the above-mentioned embodiments, and will not be repeated here. It should be noted that, in this embodiment, after thecalculation unit 51 calculates the difference parameter, thecalculation unit 51 will output the difference parameter to thecorrection unit 61 and thebacklight module 31 . Not only thecalibration unit 61 can perform brightness compensation according to the difference parameter, but thebacklight module 31 can also perform brightness compensation according to the difference parameter. The advantage of this approach is that thecorrection unit 61 and thebacklight module 31 can be used to perform dual brightness compensation at the same time, so that the brightness compensation of the brightness distortion caused by the temperature and aging of the backlight module can be adjusted more flexibly.

图8是依照本发明的第七实施例的一种背光模块的亮度补偿装置架构图，请参考图8。在本实施例中，背光模块31、光感测单元41、运算单元51与校正单元61可参考上述诸实施例，在此不予赘述。值得注意的是，在本实施例中，光感测单元41可通过基板101来量测。基板101例如是偏光板、玻璃基板、彩色滤光片、配向膜、液晶面板或是光学膜片等等...。换言之，本领域的技术人员可依其需求将光感测单元41配置于液晶面板中的任何一层，或是将光感测单元41配置于背光模块31中的任何一层。也就是说，只要光感测单元41能感测到背光模块31所发出的光源，即可依照本发明的精神与上述诸实施例来补偿背光模块31因老化或温度所造成的亮度与色彩失真。此外针对光感测单元41摆放的位置不同，可适当地调整预设亮度，以利于计算差异参数，在此则不予赘述。FIG. 8 is a structural diagram of a brightness compensation device for a backlight module according to a seventh embodiment of the present invention, please refer to FIG. 8 . In this embodiment, thebacklight module 31 , the photo-sensingunit 41 , thecomputing unit 51 and thecalibration unit 61 can refer to the above-mentioned embodiments, and will not be repeated here. It should be noted that, in this embodiment, thelight sensing unit 41 can be measured through thesubstrate 101 . Thesubstrate 101 is, for example, a polarizer, a glass substrate, a color filter, an alignment film, a liquid crystal panel, or an optical film, etc. . . . In other words, those skilled in the art can configure the photo-sensingunit 41 on any layer of the liquid crystal panel, or configure the photo-sensingunit 41 on any layer of thebacklight module 31 according to their needs. That is to say, as long as thelight sensing unit 41 can sense the light source emitted by thebacklight module 31, the brightness and color distortion of thebacklight module 31 caused by aging or temperature can be compensated according to the spirit of the present invention and the above-mentioned embodiments. . In addition, according to the different positions of thelight sensing unit 41 , the preset brightness can be adjusted appropriately to facilitate the calculation of the difference parameter, which will not be described in detail here.

综上所述，本发明的实施例至少具有下列优点：In summary, the embodiments of the present invention have at least the following advantages:

1.利用光感测单元感测背光模块的光源强度，并依据上述的光源强度与预设亮度计算差异参数，再依据差异参数调整伽马曲线和/或视讯数据，藉以减少背光模块因温度或老化而造成的亮度与色彩失真。1. Use the light sensing unit to sense the light source intensity of the backlight module, and calculate the difference parameter according to the above light source intensity and preset brightness, and then adjust the gamma curve and/or video data according to the difference parameter, so as to reduce the backlight module due to temperature or Brightness and color distortion caused by aging.

2.将校正单元整合至显示器驱动线路或将校正单元与运算单元整合至频率控制器可大幅节省硬件成本。2. Integrating the calibration unit into the display drive circuit or integrating the calibration unit and the computing unit into the frequency controller can greatly save hardware costs.

3.通过多个传感器或一个光色彩传感器可同时补偿背光模块中各颜色的光源因温度或老化而造成的亮度与色彩的失真。3. Multiple sensors or one light color sensor can simultaneously compensate the brightness and color distortion of the light sources of each color in the backlight module due to temperature or aging.

4.依据差异参数调整伽马曲线和/或视讯数据的同时，背光模块也可同时依据差异参数来进行亮度的多重补偿，使亮度补偿更具有弹性调整。4. While adjusting the gamma curve and/or video data according to the difference parameters, the backlight module can also perform multiple brightness compensations according to the difference parameters at the same time, so that the brightness compensation can be adjusted more flexibly.

虽然本发明已以较佳实施例披露如上，然其并非用以限定本发明，任何所属领域中的技术人员，在不脱离本发明的精神和范围的前提下可作若干的更动与润饰，因此本发明的保护范围以本发明的权利要求为准。Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any skilled person in the field can make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims of the present invention.

Claims (9)

1. brightness of backlight module compensation method is applicable to that a display device presents a video signal data, and this luminance compensation method comprises the following steps:

One intensity of light source of this backlight module of sensing;

According to this intensity of light source and default brightness calculation one difference parameter; And

Adjust this video signal data according to this difference parameter,

Wherein also comprise the following steps: according to a red light source intensity and red default brightness calculation one a red difference parameter according to this intensity of light source and the step that should preset this difference parameter of brightness calculation; According to a green light source intensity and green default brightness calculation one a green difference parameter; And according to a blue-light source intensity and blue default brightness calculation one a blue difference parameter,

The step of wherein calculating this redness difference parameter, this green difference parameter, this blueness difference parameter also comprises the following steps: to calculate S according to following formula₁, S₂With S₃, S wherein₁, S₂With S₃Be respectively this redness difference parameter, this green difference parameter, this blueness difference parameter:

${\left[\begin{array}{ccc}(V_{\mathrm{rr}}-V_{r\_\mathrm{dark}})\mathrm{PWM}\left(R\right),& (V_{\mathrm{rg}}-V_{r\_\mathrm{dark}})\mathrm{PWM}\left(G\right),& (V_{\mathrm{rb}}-V_{r\_\mathrm{dark}})\mathrm{PWM}\left(B\right)\\ (V_{\mathrm{gr}}-V_{g\_\mathrm{dark}})\mathrm{PWM}\left(R\right),& (V_{\mathrm{gg}}-V_{g\_\mathrm{dark}})\mathrm{PWM}\left(G\right),& (V_{\mathrm{gb}}-V_{g\_\mathrm{dark}})\mathrm{PWM}\left(B\right)\\ (V_{\mathrm{br}}-V_{b\_\mathrm{dark}})\mathrm{PWM}\left(R\right),& (V_{\mathrm{bg}}-V_{b\_\mathrm{dark}})\mathrm{PWM}\left(G\right),& (V_{\mathrm{bb}}-V_{b\_\mathrm{dark}})\mathrm{PWM}\left(B\right)\end{array}\right]}^{-1}\&times;$

$\left[\begin{array}{c}{V}_m\left(R\right)-V_{r\_\mathrm{dark}}\\ V_m\left(G\right)-V_{g\_\mathrm{dark}}\\ V_m\left(B\right)-V_{b\_\mathrm{dark}}\end{array}\right]=\left[\begin{array}{ccc}{S}_1,& S_2,& S_3\end{array}\right],$

V wherein_Rr, V_Gr, V_BrBe respectively the described blue-light source intensity that described green light source intensity and blue sensor that described red light source intensity, green sensor that red light sensor sensed when using the fixed drive electric current to drive red light emitting diodes incessantly sensed are sensed; V_Rg, V_Gg, V_BgBe respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when using the fixed drive electric current to drive green LED incessantly sensed are sensed; V_Rb, V_Gb, V_BbBe respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when using the fixed drive electric current to drive blue LED incessantly sensed are sensed; V_m(R), V_m(G), V_mThe described blue-light source intensity that described green light source intensity and the described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when (B) being respectively aging or temperature variation sensed sensed; V_{R_dark}, V_{G_dark}, V_{B_dark}Be respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when described red light emitting diodes, described green LED and described blue LED are all turned off sensed are sensed; And PWM (R) time cycle of lighting divided by described red light emitting diodes, the time cycle that PWM (G) lighted divided by described green LED for the time of lighting of default described green LED, the time cycle that PWM (B) lighted divided by described blue LED for the time of lighting of default described blue LED for the time of lighting of default described red light emitting diodes.

2. luminance compensation method as claimed in claim 1 also comprises the following steps:

Adjust a red gamma curve according to this redness difference parameter, adjust a green gamma curve according to this green difference parameter, and adjust a blue gamma curve according to this blueness difference parameter, this redness, green and blue gamma curve are in order to the brightness of this video signal data of conversion image.

3. luminance compensation method as claimed in claim 1 also comprises the following steps:

According to this redness difference parameter, this green difference parameter and should the blueness difference parameter at least one adjust the intensity of light source of this backlight module.

4. luminance compensation method as claimed in claim 1, wherein the step of the intensity of light source of this backlight module of sensing also comprises:

The intensity of light source by this backlight module of substrate sensing.

5. a brightness of backlight module compensation system is applicable to that a display device presents a video signal data, and this luminance compensating mechanism comprises:

One light sensing unit is used for the intensity of light source of this backlight module of sensing;

One arithmetic element is coupled to this light sensing unit, and this arithmetic element is according to this intensity of light source and default brightness calculation one difference parameter; And

One correcting unit is coupled to this arithmetic element, and this correcting unit is adjusted a gamma curve and/or this video signal data according to this difference parameter, and this gamma curve is in order to the brightness of this video signal data of conversion image,

Wherein this light sensing unit also comprises: a red light sensor is used for the intensity of light source of sensing based on ruddiness, and exports a red light source intensity and give this arithmetic element; One green sensor is used for the intensity of light source of sensing based on green glow, and exports a green light source intensity and give this arithmetic element; And a blue sensor, be used for the intensity of light source of sensing, and export a blue-light source intensity and give this arithmetic element based on blue light,

Wherein this arithmetic element is according to this a red light source intensity and red default brightness calculation one a red difference parameter, this arithmetic element is according to this a green light source intensity and green default brightness calculation one a green difference parameter, this arithmetic element is according to this a blue-light source intensity and blue default brightness calculation one a blue difference parameter

Wherein this arithmetic element is calculated S according to following formula₁, S₂With S₃, S wherein₁, S₂With S₃Be respectively this redness difference parameter, this green difference parameter, this blueness difference parameter:

${\left[\begin{array}{ccc}(V_{\mathrm{rr}}-V_{r\_\mathrm{dark}})\mathrm{PWM}\left(R\right),& (V_{\mathrm{rg}}-V_{r\_\mathrm{dark}})\mathrm{PWM}\left(G\right),& (V_{\mathrm{rb}}-V_{r\_\mathrm{dark}})\mathrm{PWM}\left(B\right)\\ (V_{\mathrm{gr}}-V_{g\_\mathrm{dark}})\mathrm{PWM}\left(R\right),& (V_{\mathrm{gg}}-V_{g\_\mathrm{dark}})\mathrm{PWM}\left(G\right),& (V_{\mathrm{gb}}-V_{g\_\mathrm{dark}})\mathrm{PWM}\left(B\right)\\ (V_{\mathrm{br}}-V_{b\_\mathrm{dark}})\mathrm{PWM}\left(R\right),& (V_{\mathrm{bg}}-V_{b\_\mathrm{dark}})\mathrm{PWM}\left(G\right),& (V_{\mathrm{bb}}-V_{b\_\mathrm{dark}})\mathrm{PWM}\left(B\right)\end{array}\right]}^{-1}\&times;$

$\left[\begin{array}{c}{V}_m\left(R\right)-V_{r\_\mathrm{dark}}\\ V_m\left(G\right)-V_{g\_\mathrm{dark}}\\ V_m\left(B\right)-V_{b\_\mathrm{dark}}\end{array}\right]=\left[\begin{array}{ccc}{S}_1,& S_2,& S_3\end{array}\right],$

V wherein_Rr, V_Gr, V_BrBe respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when using the fixed drive electric current to drive red light emitting diodes incessantly sensed are sensed; V_Rg, V_Gg, V_BgBe respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when using the fixed drive electric current to drive green LED incessantly sensed are sensed; V_Rb, V_Gh, V_BbBe respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when using the fixed drive electric current to drive blue LED incessantly sensed are sensed; V_m(R), V_m(G), V_mThe described blue-light source intensity that described green light source intensity and the described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when (B) being respectively aging or temperature variation sensed sensed; V_{R_dark}, V_{G_dark}, V_{B_dark}Be respectively the described blue-light source intensity that described green light source intensity and described blue sensor that described red light source intensity, described green sensor that described red light sensor sensed when described red light emitting diodes, described green LED and described blue LED are all turned off sensed are sensed; And PWM (R) time cycle of lighting divided by described red light emitting diodes, the time cycle that PWM (G) lighted divided by described green LED for the time of lighting of default described green LED, the time cycle that PWM (B) lighted divided by described blue LED for the time of lighting of default described blue LED for the time of lighting of default described red light emitting diodes.

6. luminance compensating mechanism as claimed in claim 5, wherein this correcting unit also comprises:

One data mapping unit is coupled to this arithmetic element, with according to this redness difference parameter, this green difference parameter with should the blueness difference parameter do corresponding adjustment to video signal data respectively; And

One gamma unit map is coupled to this data mapping unit, to adjust a red gamma curve according to this redness difference parameter, adjusts a green gamma curve according to this green difference parameter, adjusts a blue gamma curve according to this blueness difference parameter.

7. luminance compensating mechanism as claimed in claim 5, wherein this light sensing unit also comprises:

One signal conversion unit, be coupled between this arithmetic element, this red light sensor, this green sensor and this blue sensor, this signal conversion unit receives and exports an electrical signal that forms from this red light sensor, this green sensor and this blue sensor, in order to change this electrical signal to offer this arithmetic element.

8. luminance compensating mechanism as claimed in claim 5, wherein this backlight module according to this redness difference parameter, this green difference parameter and should the blueness difference parameter at least one adjust the intensity of light source of this backlight module.

9. luminance compensating mechanism as claimed in claim 5, wherein this light sensing unit is by this red light source intensity of a substrate sensing, this green light source intensity and this blue-light source intensity.

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