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Light emitting device and display device

A technology of a light-emitting device and a light-emitting part, which can be applied to static indicators, instruments, etc., can solve the problems of increased power consumption and increased power consumption loss.

Inactive Publication Date: 2006-10-25
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When LED increases drive current, such as image 3 As shown, due to the influence of internal resistance, the power consumption loss due to heat increases, so in the dynamic drive method, there is a problem of increased power consumption.

Method used

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  • Light emitting device and display device
  • Light emitting device and display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0020] In the light-emitting device of this embodiment, if figure 1 As shown, on a substrate not shown, n scanning lines 1 substantially parallel to each other and m data lines 2 substantially parallel to each other cross each other, and their intersections are formed in n×m matrix. The aforementioned n and m are positive integers, and may be different or the same. Also, power supply lines VDD for respectively supplying power supply currents to light emitting diodes (hereinafter referred to as LEDs) 3 a , 3 b , and 3 c described later are provided along the scanning lines 1 .

[0021] At the aforementioned intersection point, red LEDs 3 a , green LEDs 3 b , and blue LEDs 3 c are sequentially and alternately arranged along the scanning line 1 . The anodes of the respective LEDs 3a, 3b, and 3c are connected to corresponding power supply lines VDD, respectively. Examples of the material of the red LED 3a include InGaAlP or GaAlAs, examples of the material of the green LED 3b i...

no. 2 approach

[0033] Such as figure 1 As shown, in this second embodiment, in addition to the above-mentioned first embodiment, each group of adjacent LEDs 3a, 3b, 3c is provided with a method for measuring the brightness of at least one of the above-mentioned LEDs 3a, 3b, 3c. The photodiode (photodetector) 8. The photodiode 8 is connected to the scan line 1 corresponding to its cathode, and the anode of the photodiode 8 is connected to the light detection line 7 arranged along the data line 2 . Therefore, when the scanning line 1 becomes high level and at least one of the LEDs 3a, 3b, 3c connected to the scanning line 1 emits light, the light emission luminance of each LED 3a, 3b, 3c that emits light can be detected.

[0034] Thus, in the second embodiment, when the light output changes due to deterioration of LED luminance, etc., by mounting the photodiode 8, each of the R, G, and B LEDs 3a, 3b, and 3c can be made to emit light (lighting) individually. ), by detecting the luminous outp...

no. 3 approach

[0036] based on figure 2 A display device using the light-emitting device of the present invention as a third embodiment of the present invention will be described. Such as figure 2 As shown, it includes an active matrix (active matrix) type display device 110, an LED display portion 110a, and a driving circuit 110b for driving it.

[0037] The LEDs 3a, 3b, and 3c in the above-mentioned LED display portion 110a are arranged in a matrix (grid) as pixels (pixels), for example, 1024×768 points, based on image data, for each horizontal scanning line (line) sequentially or at intervals. displayed vertically so that images can be displayed. In the case of the above number of dots, the total number of horizontal scanning lines is 768, and one horizontal scanning line is 1024 dots. As the respective numbers of pixels, 1280×1024 dots, 1600×1200 dots, 3200×2400 dots, etc. are used as necessary.

[0038] On the other hand, a source driver 103 and a gate driver 104 constituted by an...

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PUM

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Abstract

A light emitting device of the present invention includes: a plurality of light emitting sections arranged in a matrix of nxm (n and m are positive integral numbers); power source lines for supplying power currents for light emission to the respective light emitting sections; control sections for controlling supply of the power currents to the respective light emitting sections; drive control sections for controlling by connecting or disconnecting respective control signals to the control sections; and holding sections for holding the control signals each indicative of supply of the power current to each of the light emitting sections. With this structure, a flat type light emitting device and a display device can be provided which realize (i) uniform light emission by easily adjusting hue and brightness of light emission in a flat panel including the light emitting sections and (ii) reduction in power consumption.

Description

technical field [0001] The present invention relates to a planar light-emitting device and a display device including a plurality of self-luminous elements such as light-emitting diodes (hereinafter referred to as LEDs), which can be easily made to emit light uniformly and can save power. Background technique [0002] In the past, compared with electric lights, LEDs have high color purity and good visibility, do not require colored lenses, do not have false lighting caused by sunlight such as sunset, consume less than one-third of the power consumption, and have a long service life, which can reduce the number of maintenance Or cost, since multiple LEDs are used in parallel, the possibility of completely turning off the lights can be avoided. Therefore, it is widely used as a flat light-emitting device or a display device especially in the outdoors (for example, refer to "The Charm of the Blue Light" edited by Isamu Akasaki Published by: Industrial Research Society Published...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/22G09G3/32G09G3/3216G09G3/3233G09G3/3266G09G3/3275G09G3/3283G09G3/3291
CPCG09G3/3266G09G3/3275G09G2300/0842G09G2310/027G09G2330/021G09G2360/148
Inventor 石仓卓郎
Owner SHARP KK
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