CN103854595A - Writing apparatus, light emitting diode display panel, and emitter - Google Patents

Abstract

Translated fromChinese

一种发光二极管显示板，包括由多个像素单元排列组成的阵列及控制各像素单元的控制电路，每个像素单元包括光源及驱动电路，每个像素单元还包括光侦测器，该发光二极管显示板还包括电连接至驱动电路的接收器，接收器根据外界信号输出对光源进行选择的第一信号给控制电路，当一外界光源在该阵列上移动时，相应的像素单元的光侦测器侦测到外界光源的移动而发出第二信号并传递给控制电路，控制电路再根据第一信号及第二信号通过驱动电路点亮相应像素单元的光源，从而使发光二极管显示板上呈现出与外界光源的移动对应的轨迹。本发明还提供一种发射器及一种书写装置。

A light-emitting diode display panel, including an array composed of a plurality of pixel units and a control circuit for controlling each pixel unit, each pixel unit includes a light source and a driving circuit, each pixel unit also includes a photodetector, the light-emitting diode The display panel also includes a receiver electrically connected to the drive circuit, the receiver outputs the first signal for selecting the light source to the control circuit according to the external signal, when an external light source moves on the array, the light detection of the corresponding pixel unit The device detects the movement of the external light source and sends out a second signal and transmits it to the control circuit, and the control circuit lights up the light source of the corresponding pixel unit through the drive circuit according to the first signal and the second signal, so that the light-emitting diode display panel presents a The trajectory corresponding to the movement of the ambient light source. The invention also provides a transmitter and a writing device.

Description

Translated fromChinese

书写装置及其发光二极管显示板及发射器Writing device and its light-emitting diode display panel and emitter

技术领域technical field

本发明涉及一种书写装置及其发光二极管显示板及发射器。The invention relates to a writing device, a light-emitting diode display panel and a transmitter thereof.

背景技术Background technique

传统的黑板是利用粉笔在玻璃质的平板上书写，书写或擦拭过程中产生大量的粉层。该粉层不但污染环境，甚至直接提高使用者的呼吸道疾病病发率。Traditional blackboard is to utilize chalk to write on glassy flat plate, produces a large amount of powder layers in writing or wiping process. The powder layer not only pollutes the environment, but even directly increases the incidence of respiratory diseases of users.

发明内容Contents of the invention

有鉴于此，有必要提供一种无粉尘的书写装置及其发光二极管显示板及发射器。In view of this, it is necessary to provide a dust-free writing device and its LED display panel and emitter.

一种发光二极管显示板，包括由多个像素单元排列组成的阵列及控制各像素单元的控制电路，每个像素单元包括光源及驱动电路，每个像素单元还包括光侦测器，该发光二极管显示板还包括电连接至驱动电路的接收器，接收器根据外界信号输出对光源进行选择的第一信号给控制电路，当一外界光源在该阵列上移动时，相应的像素单元的光侦测器侦测到外界光源的移动而发出第二信号并传递给控制电路，控制电路再根据第一信号及第二信号通过驱动电路点亮相应像素单元的光源，从而使发光二极管显示板上呈现出与外界光源的移动对应的轨迹。A light-emitting diode display panel, including an array composed of a plurality of pixel units and a control circuit for controlling each pixel unit, each pixel unit includes a light source and a driving circuit, each pixel unit also includes a photodetector, the light-emitting diode The display panel also includes a receiver electrically connected to the drive circuit, the receiver outputs the first signal for selecting the light source to the control circuit according to the external signal, when an external light source moves on the array, the light detection of the corresponding pixel unit The device detects the movement of the external light source and sends out a second signal and transmits it to the control circuit, and the control circuit lights up the light source of the corresponding pixel unit through the drive circuit according to the first signal and the second signal, so that the light-emitting diode display panel presents a The trajectory corresponding to the movement of the ambient light source.

一种发射器，配合上述发光二极管显示板使用，该发射器包括模式选择模块、第一发射端以及第二发射端，该第一发射端根据该模式选择模块选择的模式发出信号给接收器，使接收器产生第一信号，该第二发射端发出光信号照射相应像素单元的光侦测器，使光侦测器产生第二信号。A transmitter used in conjunction with the LED display panel above, the transmitter includes a mode selection module, a first transmitter and a second transmitter, the first transmitter sends a signal to the receiver according to the mode selected by the mode selection module, The receiver is made to generate a first signal, and the second transmitting end emits a light signal to irradiate the photodetector of the corresponding pixel unit, so that the photodetector generates a second signal.

一种发射器，用于配合一发光二极管显示板使用，该发光二极管显示板包括由多个像素单元排列组成的阵列及控制各像素单元的控制电路，每个像素单元包括驱动电路及多种可发出不同颜色光的光源，该发射器包括模式选择模块，该模式选择模块包括一一对应该多种可发出不同颜色的光源的多种模式，该发射器还包含第一发射端与第二发射端，当选择该模式选择模块的其中一模式时，该发射器的第一发射端发出点亮该模式对应颜色的光源的第一信号给控制电路，该发射器的第二发射端发出第二信号给该控制电路，该控制电路再根据第一信号及第二信号通过驱动电路点亮相应像素单元的光源。A transmitter for use with a light-emitting diode display panel. The light-emitting diode display panel includes an array composed of a plurality of pixel units and a control circuit for controlling each pixel unit. Each pixel unit includes a drive circuit and various A light source that emits light of different colors. The emitter includes a mode selection module. The mode selection module includes multiple modes corresponding to a variety of light sources that can emit different colors. The emitter also includes a first emitter and a second emitter. terminal, when one of the modes of the mode selection module is selected, the first transmitting terminal of the transmitter sends a first signal to light the light source of the color corresponding to the mode to the control circuit, and the second transmitting terminal of the transmitter sends a second The signal is sent to the control circuit, and the control circuit lights up the light source of the corresponding pixel unit through the driving circuit according to the first signal and the second signal.

一种书写装置，包括发光二极管显示板及与发光二极管显示板配合使用的发射器，该发光二极管显示板包括由多个像素单元排列组成的阵列及控制各像素单元的控制电路，每个像素单元包括驱动电路、光侦测器及多种可发出不同颜色光的光源，该发光二极管显示板还包括电连接至驱动电路的接收器，该发射器包括模式选择模块，该模式选择模块包括一一对应该多种可发出不同颜色的光源的多种模式，该发射器还包含第一发射端及第二发射端，当选择该模式选择模块的其中一模式时，该发射器的第一发射端向该接收器发出点亮该模式对应颜色的光源的第一信号，该发射器的第二发射端发出第二信号给该光侦测器，该接收器与该光侦测器将接收到的第一信号与第二信号输出给控制电路，该控制电路再根据第一信号及第二信号通过驱动电路点亮相应像素单元的光源。A writing device, comprising a light-emitting diode display panel and an emitter used in conjunction with the light-emitting diode display panel, the light-emitting diode display panel includes an array composed of a plurality of pixel units arranged and a control circuit for controlling each pixel unit, each pixel unit It includes a driving circuit, a light detector and a variety of light sources that can emit light of different colors. The LED display panel also includes a receiver electrically connected to the driving circuit. The transmitter includes a mode selection module, and the mode selection module includes one by one Corresponding to the multiple modes that can emit different colors of light sources, the transmitter also includes a first transmitter and a second transmitter. When one of the modes of the mode selection module is selected, the first transmitter of the transmitter Send a first signal to the receiver to light up the light source of the color corresponding to the mode, the second transmitting end of the transmitter sends a second signal to the photodetector, the receiver and the photodetector will receive The first signal and the second signal are output to the control circuit, and the control circuit lights up the light source of the corresponding pixel unit through the driving circuit according to the first signal and the second signal.

由于该发光二极管显示板是通过接收外界信号来控制该像素单元出光的，使用过程中无需用到会产生粉层的物质，避免了粉尘的产生。再有，通过该发射器在该发光二极管显示板上书写，使用者可以在较远距离实现书写，而不必按压即可驱动该像素单元出光。并且使用者可以在距离黑板较近的讲台上与距离黑板较远的其他位置处实现互动。Since the light-emitting diode display panel controls the light output of the pixel unit by receiving external signals, there is no need to use substances that will generate powder layers during use, thereby avoiding the generation of dust. Furthermore, by using the emitter to write on the light-emitting diode display board, the user can realize writing at a relatively long distance, and the pixel unit can be driven to emit light without pressing. And users can interact with other positions farther away from the blackboard on the podium closer to the blackboard.

附图说明Description of drawings

图1是本发明一实施例中的书写装置的示意图。Fig. 1 is a schematic diagram of a writing device in an embodiment of the present invention.

图2是图1所示书写装置中的发光二极管显示板的像素阵列的示意图。FIG. 2 is a schematic diagram of a pixel array of an LED display panel in the writing device shown in FIG. 1 .

图3是图2所示圆圈III的放大图。FIG. 3 is an enlarged view of circle III shown in FIG. 2 .

主要元件符号说明Description of main component symbols

1010像素单元pixel unit1111第一色光源firstcolor light source1212第二色光源Secondcolor light source1313第三色光源Tertiarycolor light source1414驱动电路Drive circuit1515光侦测器light detector2020发射器launcher21twenty one第一模式first mode22twenty two第二模式second mode23twenty three第三模式third mode24twenty four第四模式fourth mode2525第一发射端first transmitter2626第二发射端second transmitter3030接收器receiver3131第一接收端first receiver3232第二接收端second receiver3333第三接收端third receiver3434第四接收端fourth receiver100100阵列array200200发光二极管显示板LED display board

如下具体实施方式将结合上述附图进一步说明本发明。The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

具体实施方式Detailed ways

请参阅图1，本发明的书写装置包括一发光二极管显示板200及与该发光二极管显示板200配合使用的发射器20。请同时参阅图2-3，该发光二极管显示板200包括由多个像素单元10排列组成的阵列100、控制电路（图未示）、接收器30以及配合使用的发射器20。可以理解地，该像素单元10为微单元，该阵列100包含多少个该像素单元10是视该发光二极管显示板200的大小而定，并且单个像素单元10的出光面面积与整块发光二极管显示板200的使用面积的比值越小，则发光二极管显示板200的视觉效果更清晰。Please refer to FIG. 1 , the writing device of the present invention includes an LED display panel 200 and an emitter 20 used in conjunction with the LED display panel 200 . Please refer to FIGS. 2-3 at the same time. The LED display panel 200 includes anarray 100 composed of a plurality ofpixel units 10 , a control circuit (not shown in the figure), a receiver 30 and a matched emitter 20 . It can be understood that thepixel unit 10 is a micro unit, howmany pixel units 10 thearray 100 includes depends on the size of the light emitting diode display panel 200, and the light emitting surface area of asingle pixel unit 10 is comparable to that of the entire light emitting diode display. The smaller the ratio of the used area of the panel 200 is, the clearer the visual effect of the LED display panel 200 is.

在本实施例中，每一像素单元10包含第一色光源11、第二色光源12、第三色光源13、驱动电路14以及光侦测器15。本实施中该第一色光源11、第二色光源12以及第三色光源13分别为红光光源、绿光光源以及蓝光光源。当然，实际使用时，该第一色光源11、第二色光源12以及第三色光源13各自对应红光光源、绿光光源以及蓝光光源中的一种即可。该第一色光源11、第二色光源12以及第三色光源13的出光由该驱动电路14通过接收到的信号来进行控制。各像素单元10的驱动电路14均与该接收器30连接，以接收控制信号驱动光源发光。该接收器30根据外界信号输出相应的电信号预输入一个选择信号给控制电路。该接收器30包括对应该第一色光源11的第一接收端31、对应该第二色光源12的第二接收端32、对应该第三色光源13的第三接收端33以及第四接收端34。当该接收器30的其中一个或多个接收端接收到信号时，预输入一个或多个选择信号给控制电路，此时控制电路并不输出信号给驱动电路14。换句话说，此时像素单元100并没有被点亮。当像素单元10的光侦测器15同时接收到光信号时，其产生轨迹信号传输给控制电路，控制电路再综合选择信号及轨迹信号进行判断，通过该驱动电路14选择性地点亮该像素单元10中的第一色光源11、第二色光源12以及第三色光源13中的其中一个或多个。In this embodiment, eachpixel unit 10 includes a firstcolor light source 11 , a secondcolor light source 12 , a thirdcolor light source 13 , adriving circuit 14 and alight detector 15 . In this embodiment, the firstcolor light source 11 , the secondcolor light source 12 and the thirdcolor light source 13 are respectively a red light source, a green light source and a blue light source. Of course, in actual use, the firstcolor light source 11 , the secondcolor light source 12 and the thirdcolor light source 13 each correspond to one of the red light source, the green light source and the blue light source. The output light of the firstcolor light source 11 , the secondcolor light source 12 and the thirdcolor light source 13 is controlled by thedrive circuit 14 through the received signals. Thedriving circuit 14 of eachpixel unit 10 is connected to the receiver 30 to receive a control signal to drive the light source to emit light. The receiver 30 outputs a corresponding electric signal according to an external signal and pre-inputs a selection signal to the control circuit. The receiver 30 includes a first receiving end 31 corresponding to the firstcolor light source 11, a second receiving end 32 corresponding to the secondcolor light source 12, a third receiving end 33 corresponding to the thirdcolor light source 13, and a fourth receiving end. End 34. When one or more receiving ends of the receiver 30 receive signals, one or more selection signals are pre-inputted to the control circuit, and the control circuit does not output signals to thedriving circuit 14 at this time. In other words, thepixel unit 100 is not turned on at this time. When thelight detector 15 of thepixel unit 10 receives the light signal at the same time, it generates a track signal and transmits it to the control circuit, and the control circuit then synthesizes the selection signal and the track signal to make a judgment, and selectively lights up the pixel through thedrive circuit 14 One or more of the firstcolor light source 11 , the secondcolor light source 12 and the thirdcolor light source 13 in theunit 10 .

该发射器20作为一遥控器，其具有多个模式选择按钮以及发射端。在本实施方式中，该发射器20具有四个按钮以及第一发射端25、第二发射端26两个发射端。该第一发射端25发射红外线控制该接收器30以对控制电路输入选择信号。该第二发射端26发射准直红外光点亮相关的像素单元10。该第一发射端25与该第二发射端26发射不同频率的红外光。该四个按钮分别为控制启动该第一接收端31的第一模式21、控制启动该第二接收端32的第二模式22、控制启动该第三接收端33的第三模式23以及控制启动该第四接收端34的第四模式24，分别对应该像素单元10中的第一色光源11、第二色光源12、第三色光源13以及清除模式。当选择该第一、第二以及第三模式21、22、23时，该第一发射端25向该接收器30传递启动该第一色光源11、第二色光源12以及第三色光源13的信号。同时，该发射器20通过其第二发射端26发出的准直红外光在该阵列100前划出一道轨迹，该轨迹上对应的多个像素单元10的光侦测器14检测到该准直的红外光，进而该多个像素单元10出光呈现出该条轨迹，从而实现在发光二极管显示板200上写字及画画的功能。当该第一、第二以及第三模式21、22、23同时被选择时，该第一、第二以及第三色光源11、12、13均被点亮。像素单元10中的驱动电路14以及光侦测器15只有二者均收到信号，该第一色光源11、第二色光源12以及第三色光源13中的其中一个或多个才会被点亮。每一像素单元10中的光侦测器15设置一侦测阀值，该接收器30设置一接收阀值，限定该光侦测器15所能侦测到的频谱范围异于该接收器30所能接收的频谱范围。也即是该光侦测器15只能侦测到频率在该侦测阀值内的光，该接收器30只能接收到频率在该接收阀值内的光，从而避免外界坏境光的干扰以及第一发射端25与第二反射段26之间的影响。可以理解地，该侦测阈值与该接收阈值不仅限于界定频谱范围，也可以界定光强范围。由于该第一发射端25发射的红外线光束是发散的，所以该第一发射端25发射的红外线传到该发光二极管显示板200时，其强度已减弱至只能满足该接收器30的接收阈值，而不足满足任一像素单元10中的光侦测器15的侦测阈值。而该第二发射端26发出的是强度高于该光侦测器15的阀值的准直红外光，光线到达该发光二级显示板200时仍然保持原有的强度，因此达到该光侦测器15的侦测阈值，从而点亮相应的像素单元10。当然，该侦测阈值与该接收阈值可以同时或者择一界定频谱范围与光强范围。The transmitter 20 is used as a remote controller, which has a plurality of mode selection buttons and a transmitter. In this embodiment, the transmitter 20 has four buttons and two transmitting terminals, a first transmitting terminal 25 and a second transmitting terminal 26 . The first transmitter 25 emits infrared rays to control the receiver 30 to input a selection signal to the control circuit. The second emitting end 26 emits collimated infrared light to light up therelevant pixel unit 10 . The first emitting end 25 and the second emitting end 26 emit infrared light with different frequencies. The four buttons are respectively the first mode 21 for controlling and starting the first receiving end 31, the second mode 22 for controlling and starting the second receiving end 32, the third mode 23 for controlling and starting the third receiving end 33, and the control starting The fourth mode 24 of the fourth receiving end 34 respectively corresponds to the firstcolor light source 11 , the secondcolor light source 12 , the thirdcolor light source 13 and the clearing mode in thepixel unit 10 . When the first, second, and third modes 21, 22, and 23 are selected, the first transmitter 25 transmits to the receiver 30 to activate the firstcolor light source 11, the secondcolor light source 12, and the thirdcolor light source 13. signal of. At the same time, the collimated infrared light emitted by the emitter 20 through its second emitting end 26 draws a track in front of thearray 100, and thephotodetectors 14 of a plurality ofpixel units 10 corresponding on the track detect the collimated infrared light. Infrared light, and then the plurality ofpixel units 10 emit light to present the track, thereby realizing the functions of writing and drawing on the LED display panel 200 . When the first, second and third modes 21 , 22 and 23 are selected simultaneously, the first, second and thirdcolor light sources 11 , 12 and 13 are all turned on. Only when thedriving circuit 14 and thelight detector 15 in thepixel unit 10 both receive signals, one or more of the firstcolor light source 11 , the secondcolor light source 12 and the thirdcolor light source 13 will be activated. light up. Thephotodetector 15 in eachpixel unit 10 is provided with a detection threshold, and the receiver 30 is provided with a reception threshold, limiting the range of spectrum that thephotodetector 15 can detect is different from that of the receiver 30 The spectrum range that can be received. That is to say, thephotodetector 15 can only detect the light whose frequency is within the detection threshold, and the receiver 30 can only receive the light whose frequency is within the receiving threshold, thereby avoiding the interference of external ambient light. Interference and the influence between the first transmitting end 25 and the second reflecting section 26 . It can be understood that the detection threshold and the receiving threshold are not limited to define the spectrum range, but also can define the light intensity range. Since the infrared light beam emitted by the first emitting end 25 is divergent, when the infrared rays emitted by the first emitting end 25 reach the LED display panel 200, its intensity has been weakened to only meet the receiving threshold of the receiver 30 , but not enough to meet the detection threshold of thelight detector 15 in anypixel unit 10 . What the second emitting end 26 sends is the collimated infrared light whose intensity is higher than the threshold value of thephotodetector 15. The detection threshold of thedetector 15 is determined to light up the correspondingpixel unit 10 . Certainly, the detection threshold and the receiving threshold can define the spectrum range and the light intensity range simultaneously or alternatively.

当该发射器20选择第四模式24时，接收器30接收到发射器20的信号而输出部分清除信号给控制电路。该第二发射端26在该阵列100前划出轨迹，各像素单元10的光侦测器14检测到该准直的红外光，进而输出轨迹信号给控制电路。控制电路综合部分清除信号及轨迹信号，控制驱动电路14熄灭对应轨迹的像素单元10，从而实现在发光二极管显示板200的部分清除功能。此外，该第四模式24还可配合第一模式21、第二模式22以及第三模式23对已经点亮的像素单元100中的相应颜色进行选择性地消除。可以理解地，当需要全部清除时，可同时选择该第一模式21、第二模式22、第三模式23以及第四模式24或者直接关闭该第一发射端25。When the transmitter 20 selects the fourth mode 24, the receiver 30 receives the signal from the transmitter 20 and outputs a partial clear signal to the control circuit. The second emitting end 26 draws a track in front of thearray 100 , and thelight detector 14 of eachpixel unit 10 detects the collimated infrared light, and then outputs a track signal to the control circuit. The control circuit synthesizes the partial clearing signal and the track signal, and controls the drivingcircuit 14 to turn off thepixel unit 10 corresponding to the track, thereby realizing the partial clearing function on the LED display panel 200 . In addition, the fourth mode 24 can cooperate with the first mode 21 , the second mode 22 and the third mode 23 to selectively eliminate the corresponding colors in the already litpixel units 100 . Understandably, when all clearing is required, the first mode 21 , the second mode 22 , the third mode 23 and the fourth mode 24 can be selected simultaneously or the first transmitting end 25 can be directly turned off.

由于该发光二极管显示板200是通过接收外界信号来控制该像素单元10出光的，使用过程中无需用到会产生粉层的物质，避免了粉尘的产生。再有，通过该发射器20在该阵列100上书写，使用者可以在较远距离实现书写，而不必按压即可驱动该像素单元10出光。并且使用者可以在距离黑板较近的讲台上与距离黑板较远的其他位置处实现互动。Since the light-emitting diode display panel 200 controls thepixel unit 10 to emit light by receiving an external signal, there is no need to use substances that will generate a powder layer during use, thereby avoiding the generation of dust. Furthermore, by using the emitter 20 to write on thearray 100 , the user can write at a relatively long distance without pressing thepixel unit 10 to emit light. And users can interact with other positions farther away from the blackboard on the podium closer to the blackboard.

Claims (10)

1. a light-emitting diode display panel, comprise the array being rearranged by multiple pixel cells and control the control circuit of each pixel cell, each pixel cell comprises light source and driving circuit, it is characterized in that: each pixel cell also comprises optical detector, this light-emitting diode display panel also comprises the receiver that is electrically connected to driving circuit, receiver is exported the first signal that light source is selected to control circuit according to outer signals, in the time that an external light source moves on this array, the optical detector of corresponding pixel cell detects moving of external light source and sends secondary signal and pass to control circuit, control circuit is lighted the light source of respective pixel unit again by driving circuit according to first signal and secondary signal, thereby make to present on light-emitting diode display panel the track corresponding with the movement of external light source.

2. light-emitting diode display panel as claimed in claim 1, it is characterized in that: this light source comprises the first color light source, the second color light source and three-color light source, this first color light source, the second color light source, three-color light source is corresponding red-light source separately, green-light source, one in blue light source, this receiver comprises the first receiving end of corresponding the first color light source, corresponding the second receiving end of the second color light source and the 3rd receiving end of corresponding three-color light source, the first signal that this receiver is exported to control circuit according to the outer signals receiving is to first, in second and third color light source one, two or the signal all selected.

3. light-emitting diode display panel as claimed in claim 2, it is characterized in that: this controller also comprises the 4th receiving end, the 4th receiving end coordinates this first receiving end to extinguish this first color light source, the 4th receiving end coordinates this second receiving end to extinguish this second color light source, and the 4th receiving end coordinates the 3rd receiving end to extinguish this three-color light source.

4. light-emitting diode display panel as claimed in claim 1, is characterized in that: the signal spectrum scope that this optical detector receives is different from the signal spectrum scope that receiver receives.

5. a transmitter, coordinate above-mentioned 2-4 item wherein the light-emitting diode display panel described in any one use, it is characterized in that: this transmitter comprises mode selection module, the first transmitting terminal and the second transmitting terminal, the pattern that this first transmitting terminal is selected according to this mode selection module is sent signal to receiver, make receiver produce first signal, this second transmitting terminal sends the optical detector of light signal irradiation respective pixel unit, makes optical detector produce secondary signal.

6. transmitter as claimed in claim 5, it is characterized in that: this mode selection module comprises that control starts the first mode of this first receiving end, controls the second pattern that starts this second receiving end and the three-mode of controlling startup the 3rd receiving end, this first mode, the second pattern, three-mode can be selected separately, also can select wherein two or three simultaneously.

7. transmitter as claimed in claim 5, is characterized in that: the signal that this first transmitting terminal sends is infrared ray, and the light signal that this second transmitting terminal sends is collimation infrared light.

8. a transmitter, be used for coordinating a light-emitting diode display panel to use, this light-emitting diode display panel comprises the array being rearranged by multiple pixel cells and controls the control circuit of each pixel cell, it is characterized in that: each pixel cell comprises driving circuit and the multiple light source that sends different colours light, this transmitter comprises mode selection module, this mode selection module comprises one by one to should multiplely sending the various modes of the light source of different colours, this transmitter also comprises the first transmitting terminal and the second transmitting terminal, in the time selecting a wherein pattern of this mode selection module, the first signal that the first transmitting terminal of this transmitter sends the light source of lighting this pattern corresponding color is to control circuit, the second transmitting terminal of this transmitter sends secondary signal to this control circuit, this control circuit is lighted the light source of respective pixel unit again by driving circuit according to first signal and secondary signal.

9. a writing device, the transmitter that comprises light-emitting diode display panel and be used in conjunction with light-emitting diode display panel, this light-emitting diode display panel comprises the array being rearranged by multiple pixel cells and controls the control circuit of each pixel cell, it is characterized in that: each pixel cell comprises driving circuit, optical detector and the multiple light source that sends different colours light, this light-emitting diode display panel also comprises the receiver that is electrically connected to driving circuit, this transmitter comprises mode selection module, this mode selection module comprises one by one to should multiplely sending the various modes of the light source of different colours, this transmitter also comprises the first transmitting terminal and the second transmitting terminal, in the time selecting a wherein pattern of this mode selection module, the first transmitting terminal of this transmitter sends the first signal of the light source of lighting this pattern corresponding color to this receiver, the second transmitting terminal of this transmitter sends secondary signal to this optical detector, the first signal receiving and secondary signal are exported to control circuit by this receiver and this optical detector, this control circuit is lighted the light source of respective pixel unit again by driving circuit according to first signal and secondary signal.

10. writing device as claimed in claim 9, it is characterized in that: this multiple light source that sends different colours light comprises the first color light source, the second color light source and three-color light source, this first color light source, the second color light source, three-color light source is corresponding red-light source separately, green-light source, one in blue light source, the various modes of this mode selection module comprises first mode, the second pattern, three-mode, in the time selecting this first mode, this transmitter is for sending the first signal of lighting this first color light source, in the time selecting this second pattern, this apparatus for writing is for sending the first signal of lighting this second color light source, in the time selecting this three-mode, this apparatus for writing is for sending the first signal of lighting this three-color light source, this optical detector detects moving of this transmitter and sends secondary signal to control circuit, control circuit optionally lights first, in second and third color light source one, two or whole.

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