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Pixel circuit, active matrix organic light-emitting diode display and drive method thereof

A technology of light-emitting diodes and pixel circuits, which is applied in the field of pixel circuits, active matrix organic light-emitting diode displays and drives, can solve the problems of organic light-emitting diode material attenuation, uneven panel display, etc., achieve high-quality display images, and improve panel display uneven effect

Active Publication Date: 2010-02-24
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a pixel circuit to improve the problem of panel display unevenness and the problem of material attenuation of organic light emitting diodes
[0005] Another object of the present invention is to provide an active matrix organic light emitting diode display to improve the problem of panel display unevenness and the problem of material attenuation of organic light emitting diodes
[0006] Another object of the present invention is to provide a method for driving a pixel circuit to improve the problem of uneven panel display and the problem of material attenuation of organic light emitting diodes

Method used

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  • Pixel circuit, active matrix organic light-emitting diode display and drive method thereof
  • Pixel circuit, active matrix organic light-emitting diode display and drive method thereof
  • Pixel circuit, active matrix organic light-emitting diode display and drive method thereof

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Embodiment Construction

[0051] see figure 2 , which shows an active matrix organic light emitting diode display related to an embodiment of the present invention. The active matrix OLED display 100 includes a data drive circuit 102, a scan drive circuit 104 and a plurality of pixel circuits P, figure 2 Only one pixel circuit P is shown as an example, but it is not used to limit the present invention. Such as figure 2 As shown, the data driving circuit 102 is used to provide the data voltage Vdata, and the scan driving circuit 104 is used to provide the scan signal SCAN; the pixel circuit P includes a storage capacitor Cst, a driving transistor M1 , switching transistors M2 ˜ M5 and an organic light emitting diode 110 . The driving transistor M1 is used to drive the organic light emitting diode 110 to light up. The source S1 of the driving transistor M1 is electrically coupled to the terminal A of the storage capacitor Cst, and the drain D1 of the driving transistor M1 is electrically coupled to ...

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PUM

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Abstract

The present invention provides a pixel circuit, an active matrix organic light-emitting diode display and a drive method, wherein the pixel circuit includes an organic light-emitting diode, a storagecapacitance, a drive transistor and first to fourth switch transistors. The drive transistor is used to generate a pixel current based on a quantity of electric charge stored in the storage capacitance so as to drive the organic light-emitting diode to generate a corresponding brightness; turn-on / off states of the first to fourth switch transistors are controlled by an identical scanning signal, by means of electrical coupling relations of the first to fourth switch transistors, the pixel current and power supply voltage across the organic light-emitting diode are independent of a critical voltage of the drive transistor and an increase of straddling voltage of the organic light-emitting diode is improved along with an operation of the organic light-emitting diode for a long time. The invention also provides the active matrix organic light-emitting diode display employing the pixel circuit and the drive method for the pixel circuit.

Description

technical field [0001] The invention relates to the technical field of organic light emitting diode display, and in particular to a pixel circuit, an active matrix organic light emitting diode display and a driving method. Background technique [0002] Pixels of an active matrix OLED (Organic Light Emitting Diode, OLED) display generally use transistors and storage capacitors to store charges to control the brightness of the OLED. See figure 1 , which is a schematic diagram of a conventional pixel circuit. The pixel circuit 200 includes a P-type driving transistor 202 , an N-type switching transistor 204 , a storage capacitor Cst, and an OLED 210 . The source S of the driving transistor 202 is electrically coupled to the power supply voltage OVDD; the gate G of the switching transistor 204 receives the scan signal SCAN due to the electrical coupling relationship, and the drain D receives the data voltage Vdata due to the electrical coupling relationship, The source S is e...

Claims

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Application Information

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IPC IPC(8): G09G3/32H05B37/02G09G3/3225
Inventor 蔡宗廷吴元均
Owner AU OPTRONICS CORP
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