CN101949514A

Movatterモバイル変換

Info

Publication number: CN101949514A
Application number: CN2010105067245A
Authority: CN
Inventors: 张继圣; 陈政传; 林苏逸
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2010-09-27
Filing date: 2010-09-27
Publication date: 2011-01-19

Abstract

The invention discloses a backlight module of a liquid crystal display, which comprises a plurality of groups of light-emitting components, wherein at least one light-emitting component comprises: a first white light source having a first blue dominant wavelength; and the second white light source is provided with a second blue light dominant wavelength, and the second blue light dominant wavelength is different from the first blue light dominant wavelength, wherein the first white light source and the second white light source are arranged in a staggered arrangement mode in the backlight module. By adopting the backlight module of the liquid crystal display, the brightness uniformity among the backlight units can be greatly improved while the optical characteristics of the original backlight LED are realized through the staggered arrangement and combination among the white light sources with different blue light dominant wavelengths.

Description

Translated fromChinese

一种液晶显示器的背光模块A backlight module of a liquid crystal display

技术领域technical field

本发明涉及一种液晶显示器，尤其涉及一种该液晶显示器的背光模块中光源波长的选择和设置。The invention relates to a liquid crystal display, in particular to the selection and setting of the wavelength of a light source in a backlight module of the liquid crystal display.

背景技术Background technique

当前，在液晶显示设备的背光单元中，所使用于背光的发光二极管(Light Emitting Diode，LED)，例如蓝光LED，首先经过磊晶的制造过程，并搭配荧光粉掺杂；接着在形成了白光LED成品后，经过分光分色机进行筛选，以确定白光LED的色度区。At present, in the backlight unit of the liquid crystal display device, the light-emitting diode (Light Emitting Diode, LED) used for the backlight, such as the blue LED, first undergoes the epitaxial manufacturing process and is doped with phosphor powder; then the white light is formed After the LED is finished, it is screened by a spectroscopic and color separation machine to determine the chromaticity area of the white LED.

然而，当多个不同的蓝光LED组成背光模块时，由于每只蓝光LED于制造工程中的各种环境条件不尽相同，从而往往会造成蓝光LED各自频谱的波峰值差别很大，例如，蓝光主波长从440nm至460nm的范围区间内，会有多达20nm的变化。此外，在该范围区间中，蓝光主波长通常还可细分为短波、长波、超长波和特长波，这对当前LED显示设备的光学表现有相当大的影响，形成了诸如同色异谱、色域和通用色彩标准变化(standard RGB，sRGB)、图像亮度变化以及FWHM(Full Wave Half Maximum，半最大值全波)改变等不良现象。与此同时，现有技术的白光LED的色度分区主要选用蓝光主波长的短波以及长波，其上述范围区间的利用率仅仅为50％，从而使用效率较低。However, when a plurality of different blue LEDs form a backlight module, because each blue LED has different environmental conditions in the manufacturing process, the peak values of the respective spectrums of the blue LEDs often vary greatly, for example, blue light In the range of dominant wavelength from 440nm to 460nm, there will be as much as 20nm variation. In addition, in this range interval, the main wavelength of blue light can usually be subdivided into short-wave, long-wave, ultra-long-wave and ultra-long-wave, which have a considerable impact on the optical performance of current LED display devices, forming such phenomena as metamerism, chromatic aberration, etc. Gamut and general color standard changes (standard RGB, sRGB), image brightness changes, and FWHM (Full Wave Half Maximum, full wave at half maximum) changes and other undesirable phenomena. At the same time, the chromaticity division of the white light LED in the prior art mainly selects the short-wave and long-wave of the main wavelength of blue light, and the utilization rate of the above-mentioned range is only 50%, so the use efficiency is low.

有鉴于此，如何设计一种可改善图像亮度均匀性且提高白光LED使用效率的背光模块，是业内技术人员亟待解决的一项课题。In view of this, how to design a backlight module that can improve the uniformity of image brightness and increase the use efficiency of white LEDs is an urgent problem to be solved by technicians in the industry.

发明内容Contents of the invention

针对现有技术中液晶显示器的背光模块在使用时所存在的上述缺陷，本发明提供了一种新型的液晶显示器的背光模块。Aiming at the above-mentioned defects in the use of the backlight module of the liquid crystal display in the prior art, the present invention provides a novel backlight module of the liquid crystal display.

依据本发明的一个方面，提供了一种液晶显示器的背光模块，该背光模块包括多组发光组件，其中的至少一发光组件包括：According to one aspect of the present invention, a backlight module of a liquid crystal display is provided, the backlight module includes multiple groups of light-emitting components, at least one of which includes:

第一白光源，具有第一蓝光主波长；The first white light source has the first dominant wavelength of blue light;

第二白光源，具有第二蓝光主波长，该第二蓝光主波长不同于该第一蓝光主波长，The second white light source has a second dominant wavelength of blue light, the second dominant wavelength of blue light is different from the first dominant wavelength of blue light,

其中，第一白光源和第二白光源在背光模块中被设置为交错排列方式。Wherein, the first white light source and the second white light source are arranged in a staggered arrangement in the backlight module.

较佳地，该发光组件为发光二极管、有机发光二极管或任何固态的照明组件。Preferably, the light-emitting component is a light-emitting diode, an organic light-emitting diode or any solid-state lighting component.

较佳地，第一蓝光主波长和第二蓝光主波长选自短波、长波、超长波和特长波中的任意两种。进一步，该第一蓝光主波长是短波，其波长范围介于440nm至445nm之间；以及该第二蓝光主波长是超长波，其波长范围介于450nm至455nm之间。Preferably, the first dominant wavelength of blue light and the second dominant wavelength of blue light are selected from any two of short-wave, long-wave, ultra-long-wave and ultra-long-wave. Further, the dominant wavelength of the first blue light is short wave, and its wavelength range is between 440nm and 445nm; and the second blue light dominant wavelength is ultra long wave, and its wavelength range is between 450nm and 455nm.

较佳地，第一蓝光主波长是短波，其波长范围介于440nm至445nm之间；以及第二蓝光主波长是长波，其波长范围介于445nm至450nm之间。进一步，该多个发光组件中的至少一发光组件还包括：第三白光源，具有第三蓝光主波长；以及第四白光源，具有第四蓝光主波长，其中，第三蓝光主波长是超长波，超长波的波长范围介于450nm至455nm之间，并且第四蓝光主波长是特长波，特长波的波长范围介于455nm至460nm之间。Preferably, the dominant wavelength of the first blue light is short wave, and its wavelength range is between 440nm and 445nm; and the second blue light dominant wavelength is long wave, and its wavelength range is between 445nm and 450nm. Further, at least one light-emitting component among the plurality of light-emitting components also includes: a third white light source with a third blue-light dominant wavelength; and a fourth white light source with a fourth blue-light dominant wavelength, wherein the third blue-light dominant wavelength is super The wavelength range of the long wave and the ultra-long wave is between 450nm and 455nm, and the fourth main wavelength of the blue light is an ultra-long wave, and the wavelength range of the ultra-long wave is between 455nm and 460nm.

依据本发明的另一方面，提供了一种液晶显示器的背光模块，该背光模块包括多组发光组件，其中的至少一发光组件包括：According to another aspect of the present invention, a backlight module of a liquid crystal display is provided, the backlight module includes multiple groups of light-emitting components, at least one of which includes:

第一白光源，具有第一蓝光主波长；以及a first white light source having a first blue dominant wavelength; and

第二白光源，具有第二蓝光主波长；The second white light source has a second dominant wavelength of blue light;

其中，第一蓝光主波长和第二蓝光主波长均为长波，通过控制第一白光源和第二白光源各自的温度，该第二蓝光主波长的波长数值不同于该第一蓝光主波长的波长数值，Wherein, the first blue light dominant wavelength and the second blue light dominant wavelength are both long waves, and by controlling the respective temperatures of the first white light source and the second white light source, the wavelength value of the second blue light dominant wavelength is different from that of the first blue light dominant wavelength wavelength value,

较佳地，发光组件为发光二极管、有机发光二极管或任何固态的照明组件。Preferably, the light-emitting component is a light-emitting diode, an organic light-emitting diode or any solid-state lighting component.

较佳地，长波的波长范围介于445nm至450nm之间。Preferably, the wavelength range of the long wave is between 445nm and 450nm.

采用本发明的液晶显示器的背光模块，通过具有不同蓝光主波长的各个白光源之间的交错排列组合，在实现原来背光LED的光学特性的同时，还可大幅提升各个背光单元之间的亮度均匀性。此外，由于蓝光主波长中的短波、长波、超长波和特长波均能混合交错排列，进而可以显著提高白光LED的利用率。With the backlight module of the liquid crystal display of the present invention, through the staggered arrangement and combination of the white light sources with different main wavelengths of blue light, while realizing the optical characteristics of the original backlight LED, the brightness uniformity among the backlight units can be greatly improved sex. In addition, since the short-wave, long-wave, ultra-long-wave and ultra-long-wave in the main wavelength of blue light can be mixed and interlaced, the utilization rate of white LED can be significantly improved.

附图说明Description of drawings

读者在参照附图阅读了本发明的具体实施方式以后，将会更清楚地了解本发明的各个方面。其中，Readers will have a clearer understanding of various aspects of the present invention after reading the detailed description of the present invention with reference to the accompanying drawings. in,

图1A示出白光源所发出的蓝光主波长的范围区域与各类波长之间的对照表；图1B示出本发明的背光模块中发光组件的结构的第一实施例；Fig. 1A shows the comparison table between the range area of the main wavelength of blue light emitted by the white light source and various wavelengths; Fig. 1B shows the first embodiment of the structure of the light-emitting assembly in the backlight module of the present invention;

图2示出本发明的背光模块中发光组件的结构的第二实施例；以及Fig. 2 shows the second embodiment of the structure of the light-emitting assembly in the backlight module of the present invention; and

图3示出本发明的背光模块中发光组件的结构的第三实施例。FIG. 3 shows a third embodiment of the structure of the light emitting assembly in the backlight module of the present invention.

具体实施方式Detailed ways

下面参照附图，对本发明的具体实施方式进行详细描述。Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

图1A示出白光源所发出的蓝光主波长的范围区域与各类波长(nm)之间的对照表，以及图1B示出本发明的背光模块中发光组件的结构的第一实施例。从图1A中可知，白光LED的蓝光主波长在440nm至460nm的波长范围内，大致分为四类，即波长介于440nm与445nm之间的短波、波长介于445nm与450nm之间的长波、波长介于450nm至455nm之间的超长波和位于455nm到460nm波长区间的特长波。如前所述，现有技术的白光LED，其色度分区主要选用蓝光主波长的短波(即波长为440nm至445nm)以及长波(445nm至450nm)，而基本无法使用超长波和特长波的波长范围，因而白光LED的利用率仅仅为50％。FIG. 1A shows a comparison table between the main wavelength range of blue light emitted by a white light source and various wavelengths (nm), and FIG. 1B shows a first embodiment of the structure of a light-emitting component in a backlight module of the present invention. It can be seen from Figure 1A that the dominant wavelength of blue light of white LEDs is within the wavelength range of 440nm to 460nm, which can be roughly divided into four categories, namely short-wavelength between 440nm and 445nm, long-wavelength between 445nm and 450nm, Ultra-long waves with wavelengths between 450nm and 455nm and ultra-long waves in the wavelength range of 455nm to 460nm. As mentioned above, the chromaticity division of the white light LED in the prior art mainly selects the short-wavelength (that is, the wavelength is 440nm to 445nm) and the long-wavelength (445nm-450nm) of the main wavelength of blue light, and basically cannot use the wavelength of ultra-long wave and ultra-long wave Range, so the utilization rate of white LED is only 50%.

为此，本发明针对背光模块中的发光组件，设计了一种蓝光主波长不同的多个白光源之间的新型排列结构。参照图1B，背光模块的多个发光组件中的至少一个发光组件包括第一白光源和第二白光源，优选地，第一和第二白光源均为发光二极管、有机发光二极管或任何固态的照明组件。在该实施例中，以LED为示意性说明的示例，作为第一白光源和第二白光源，即对应为LED1和LED2。For this reason, the present invention designs a novel arrangement structure among multiple white light sources with different dominant blue light wavelengths for the light-emitting components in the backlight module. Referring to FIG. 1B, at least one light-emitting component among the plurality of light-emitting components of the backlight module includes a first white light source and a second white light source. Preferably, both the first and the second white light sources are light-emitting diodes, organic light-emitting diodes, or any solid-state lighting components. In this embodiment, LEDs are taken as an example for schematic illustration, as the first white light source and the second white light source, that is, LED1 and LED2 correspondingly.

更为详细地，LED1具有第一蓝光主波长，LED2具有第二蓝光主波长，并且LED1与LED2在背光模块中被设置为交错排列方式，第二蓝光主波长不同于第一蓝光主波长。优选地，第一蓝光主波长和第二蓝光主波长选自短波、长波、超长波和特长波中的任意两种。在该实施例中，较佳地选取第一蓝光主波长为短波，其波长范围介于440nm至445nm之间，选取第二蓝光主波长为超长波，其波长范围介于450nm至455nm之间。在其它实施例中，还可选取第一蓝光主波长为短波，以及第二蓝光主波长为长波，但本发明的交错排列结构并不只局限于此。In more detail, LED1 has a first blue dominant wavelength, LED2 has a second blue dominant wavelength, and LED1 and LED2 are arranged in a staggered arrangement in the backlight module, and the second blue dominant wavelength is different from the first blue dominant wavelength. Preferably, the first dominant wavelength of blue light and the second dominant wavelength of blue light are selected from any two of short-wave, long-wave, ultra-long-wave and ultra-long-wave. In this embodiment, preferably, the dominant wavelength of the first blue light is selected as short wave, and its wavelength range is between 440nm and 445nm, and the dominant wavelength of the second blue light is selected as ultralong wave, and its wavelength range is between 450nm and 455nm. In other embodiments, the dominant wavelength of the first blue light can also be selected as short wave, and the dominant wavelength of the second blue light can be selected as long wave, but the staggered arrangement structure of the present invention is not limited thereto.

图2示出本发明的背光模块中发光组件的结构的第二实施例。参照图2，背光模块的多个发光组件中的至少一个发光组件包括四种白光源，仍然以白光LED为例，它们分别为LED1、LED2、LED3和LED4。具体来说，在该实施例中，LED1为短波，具有第一蓝光主波长；LED2为长波，具有第二蓝光主波长；LED3为超长波，具有第三蓝光主波长；以及LED4为特长波，具有第四蓝光主波长，由于图1A中所示的短波、长波、超长波和特长波各自的波长范围不同，因而第一蓝光主波长、第二蓝光主波长、第三蓝光主波长和第四蓝光主波长各自的波长数值也不同。FIG. 2 shows a second embodiment of the structure of the light emitting assembly in the backlight module of the present invention. Referring to FIG. 2 , at least one of the light emitting components of the backlight module includes four kinds of white light sources, still taking white LEDs as an example, they are LED1, LED2, LED3 and LED4 respectively. Specifically, in this embodiment, LED1 is short-wave and has a first blue-light dominant wavelength; LED2 is long-wave and has a second blue-light dominant wavelength; LED3 is an ultra-long wave and has a third blue-light dominant wavelength; and LED4 is an extra-long wave, With the fourth main wavelength of blue light, due to the different wavelength ranges of the short wave, long wave, ultra long wave and extra long wave shown in Figure 1A, the first main blue light wavelength, the second main blue light wavelength, the third main blue light wavelength and the fourth blue light main wavelength The wavelength values of the dominant wavelengths of blue light are also different.

从图1和图2所示的各个实施例可以看出，背光模块的白光LED使用范围涵盖蓝光主波长中的四个波长范围，相比于现有技术中仅使用蓝光主波长的短波和长波来说，LED的使用效率显著提升。其次，通过背光模块上交错排列的不同蓝光主波长之间的白光LED的组合，可以使不同的背光单元间的亮度和色域均匀化。例如，原来蓝光主波长的短波和长波之间的亮度差异大概为0.61m(流明)，而本发明的交错结构的发光组件的亮度差异仅仅为0.051m(流明)。It can be seen from the various embodiments shown in Fig. 1 and Fig. 2 that the use range of the white LED of the backlight module covers four wavelength ranges in the main wavelength of blue light. In terms of efficiency, the efficiency of LED has been significantly improved. Secondly, the brightness and color gamut among different backlight units can be made uniform through the combination of white LEDs with different main wavelengths of blue light interlaced on the backlight module. For example, the brightness difference between the short wave and the long wave of the original main wavelength of blue light is about 0.61m (lumen), but the brightness difference of the light-emitting component with interlaced structure of the present invention is only 0.051m (lumen).

图3示出本发明的背光模块中发光组件的结构的第三实施例。与图1和图2所不同的是，发光组件中的两个白光源(如LED1和LED2)均处于蓝光主波长的长波区间，其中LED1具有第一蓝光主波长，LED2具有第二蓝光主波长。但是，由于LED温度的高低对于波长的具体数值会产生很大的影响，通过控制LED温度就可以将LED 1和LED2各自的波长数值设置为不同。与此同时，LED1和LED2在背光模块的任一发光组件内也被设为交错排列。例如，控制白光源LED1的温度为T1，以及白光源LED2的温度为T2，当温度T1与T2设定为不同时，LED1和LED2各自的蓝光主波长也将不相同。因而，也可以利用交错排列的不同蓝光主波长之间的白光LED的组合，使不同的背光单元间的亮度和色域均匀化。FIG. 3 shows a third embodiment of the structure of the light emitting assembly in the backlight module of the present invention. The difference from Figure 1 and Figure 2 is that the two white light sources (such as LED1 and LED2) in the light-emitting component are both in the long-wavelength range of the blue dominant wavelength, where LED1 has the first blue dominant wavelength, and LED2 has the second blue dominant wavelength . However, since the temperature of the LED will have a great impact on the specific value of the wavelength, the respective wavelength values ofLED 1 and LED 2 can be set to be different by controlling the temperature of the LED. At the same time, LED1 and LED2 are arranged in a staggered manner in any light-emitting component of the backlight module. For example, the temperature of the white light source LED1 is controlled to be T1, and the temperature of the white light source LED2 is controlled to be T2. When the temperatures T1 and T2 are set to be different, the blue dominant wavelengths of LED1 and LED2 will also be different. Therefore, the staggered combination of white LEDs with different blue dominant wavelengths can also be used to make the brightness and color gamut of different backlight units uniform.

上文中，参照附图描述了本发明的具体实施方式。但是，本领域中的普通技术人员能够理解，在不偏离本发明的精神和范围的情况下，还可以对本发明的具体实施方式作各种变更和替换。这些变更和替换都落在本发明权利要求书所限定的范围内。Hereinbefore, specific embodiments of the present invention have been described with reference to the accompanying drawings. However, those skilled in the art can understand that without departing from the spirit and scope of the present invention, various changes and substitutions can be made to the specific embodiments of the present invention. These changes and substitutions all fall within the scope defined by the claims of the present invention.