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pixel circuit

A technology of pixel circuit and writing circuit, applied in the field of pixel circuit, can solve problems such as uneven display screen

Active Publication Date: 2020-08-25
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the power supply voltage provided by the display panel to the pixel circuits in different regions will produce different degrees of voltage drop due to the equivalent impedance on the wires.
[0003] When the power supply voltage of the display panel or the threshold voltage of the driving transistor varies with different regions, the display panel will face the problem of uneven display

Method used

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

[0047] Embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals represent the same or similar elements or method flows.

[0048] figure 1 It is a simplified functional block diagram of the pixel circuit 100 according to an embodiment of the present invention. The pixel circuit 100 includes a driving transistor 110 , a writing circuit 120 , a voltage regulating circuit 130 , a compensation circuit 140 and a light emitting unit 150 . The pixel circuit 100 can control the driving current Idri delivered to the light emitting unit 150, so as to control the light emitting unit 150 to generate different gray scale brightness.

[0049] In practice, the light-emitting unit 150 can be realized by light-emitting materials such as organic light-emitt...

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Abstract

A pixel circuit comprises a driving transistor, a light emitting unit, a write-in circuit, a voltage regulating circuit and a compensating circuit. The first end of the driving transistor is used forreceiving a light emitting control signal. The second end of the driving transistor is coupled with a first node. The control end of the driving transistor is coupled with a second node. The light emitting unit comprises an anode end and a cathode end. The anode end is coupled with the first node. The cathode end is used for receiving a reference voltage. The write-in circuit is coupled with the second node and a third node and is used for deciding a second node voltage according to a first control signal and a data voltage. The voltage regulating circuit is coupled with the third node and isused for deciding a third node voltage according to a second control signal and a light emitting control signal. The compensating circuit is coupled with the first node and the third node and is usedfor deciding the third node voltage according to a third control signal and the light emitting control signal.

Description

technical field [0001] The present invention relates to a pixel circuit, in particular to a pixel circuit capable of compensating the variation of the threshold voltage of a driving transistor. Background technique [0002] The low temperature poly-silicon thin-film transistor (low temperature poly-silicon thin-film transistor) has the characteristics of high carrier mobility and small size, and is suitable for display panels with high resolution, narrow frame and low power consumption. Excimer laser annealing (excimer laser annealing) technology is widely used in the industry at present to form polysilicon thin films of low temperature polysilicon thin film transistors. However, since the scanning power of each shot of the excimer laser is not stable, the polysilicon film in different regions will have differences in grain size and quantity. Therefore, in different regions of the display panel, the characteristics of the LTPS TFTs will be different. For example, LTPS TFTs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3225
CPCG09G3/32G09G3/3225G09G2320/0626
Inventor 林志隆曾金贤张瑞宏陈柏勳郑贸薰
Owner AU OPTRONICS CORP