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Organic light emitting display and voltage compensation technology organic light emitting pixel

A light-emitting display, organic technology, applied in the direction of electroluminescent light source, static indicator, instrument, etc., can solve the problem that the display brightness cannot reach the display brightness, the node X does not reach the stable offset, and the time is insufficient.

Active Publication Date: 2008-06-04
INNOLUX CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional voltage compensation technology may cause the node X to not reach the state of stably offsetting Vth2 due to insufficient time.
In this state, the thin film transistor MP1 is still turned on, so charge sharing occurs and the display brightness cannot reach the expected display brightness of the pixel voltage Vdata

Method used

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  • Organic light emitting display and voltage compensation technology organic light emitting pixel
  • Organic light emitting display and voltage compensation technology organic light emitting pixel
  • Organic light emitting display and voltage compensation technology organic light emitting pixel

Examples

Experimental program
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Effect test

no. 1 example

[0043] Please refer to figure 2 , which is a schematic diagram of an organic light emitting display according to a first embodiment of the present invention. The organic light emitting display 200 includes a driving unit 201 and organic light emitting pixels 202 . The driving unit 201 is used to drive the pixels 202 , and includes a data driving circuit 204 , a scanning driving circuit 206 and a timing control circuit 208 . The data driving circuit 204 outputs a fifth voltage to the organic light emitting pixel 202 according to the image data, wherein the fifth voltage is the pixel voltage Vdata or the low level voltage Preset. The scan driving circuit 206 is used for outputting a scan signal Scan. The timing control circuit 208 is used to output the first control signal Enb to the fifth thin film transistor T5 , and is also used to output the second control signal Rst to the reset circuit 210 . The driving unit 201 also provides a first voltage Lock, a second voltage Vdd,...

no. 2 example

[0058] This implementation differs from the first embodiment in the structure of the reset circuit. The reset circuit is instead composed of two thin film transistors which are respectively electrically connected to the two ends of the first capacitor for resetting the first capacitor and setting the potential on the node X1.

[0059] Please refer to Figure 10 , which is a schematic diagram of an organic light emitting display according to a second embodiment of the present invention. The organic light emitting display 1000 also includes a driving unit 1001 and an organic light emitting pixel 1002 . The driving unit 1001 includes a data driving circuit 1004 , a scanning driving circuit 1006 and a timing controller 1008 . The organic light emitting pixel 1002 also includes a first capacitor C1 , a first thin film transistor T1 , a second thin film transistor T2 , a third thin film transistor T3 , a fourth thin film transistor T4 , a reset circuit 1010 and an organic light em...

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Abstract

The invention discloses an organic light emitting display and an organic light emitting pixel with the voltage compensation technology, which comprise a first capacitor, a first thin film transistor, a second thin film transistor, a third thin film transistor, a reset circuit and an organic light emitting diode. The first thin film transistor receives a first voltage and the second terminal of the first thin film transistor is coupled to the grid and the first terminal of the first capacitor. The second thin film transistor receives a second voltage and the grid of the second thin film transistor is coupled to the grid of the first thin film transistor. The third thin film transistor is coupled to the first capacitor and receives a pixel voltage and a scanning signal. The reset circuit sets the first terminal of the first capacitor to be a first voltage level. The anode of the organic light emitting diode is coupled to the second terminal of the second thin film transistor and the cathode of the organic light emitting diode receives a third voltage. The invention can improve the speed of the critical voltage compensation, and can make up for the deficiency that the picture is not uniformly displayed on the prior organic light emitting display.

Description

technical field [0001] The present invention relates to an organic light emitting display, and in particular to the organic light emitting display and its organic light emitting pixel with voltage compensation technology. Background technique [0002] A pixel of an organic light emitting display (Organic Light Emitting Display) generally uses a thin film transistor (Thin Film Transistor, TFT) with a capacitor to store signals to control the brightness of an organic light emitting diode (Organic Light Emitting Diode, OLED). However, the above-mentioned thin film transistors will have a threshold voltage (Threshold Voltage, Vth) shift (shift) after a long time of use. The offset is related to the operating time of the TFT and the magnitude of the current flowing therethrough. [0003] During the display process, due to the thin film transistor used to drive the organic light emitting diode in each pixel, the current when it is turned on is different. Therefore, the threshold...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/30G09G3/20H05B33/08H05B33/14H05B37/02H01L27/32H01L51/50G09G3/3233G09G3/3258H05B44/00
Inventor 曾名骏郭鸿儒黄建翔
Owner INNOLUX CORP
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