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Pixel circuit

A pixel circuit and circuit technology, which is applied in the field of pixel circuits, can solve problems such as drive current differences, uneven brightness of display screens, and inconsistent light-emitting brightness of low-temperature polysilicon thin-film transistors, and achieve the effects of preventing flicker and solving current unevenness

Active Publication Date: 2019-07-26
AU OPTRONICS CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For example, low-temperature polysilicon thin film transistors in different regions will have different threshold voltages. Different threshold voltages will cause differences in driving current, resulting in inconsistent luminance of low-temperature polysilicon thin film transistors.
In this case, the display panel will face the problem of uneven brightness of the display screen when displaying images.

Method used

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Embodiment Construction

[0036] Embodiments of the present invention will be described below in conjunction with related figures. In the drawings, the same reference numerals represent the same or similar elements or method flows.

[0037] see figure 1 . figure 1 It is a circuit diagram of a pixel circuit 100 according to an embodiment of the disclosure. Such as figure 1 As shown, the pixel circuit 100 includes data writing circuits 110 and 120 , voltage stabilizing circuits 130 and 140 , compensation circuits 150 and 160 , driving circuits 170 and 180 , reset circuit 190 , and light emitting diodes OLED1 and OLED2 . The pixel circuit 100 can control the magnitudes of the driving currents Id1 and Id2 flowing through the LEDs OLED1 and OLED2 , so as to make the LEDs OLED1 and OLED2 produce the same or different gray scale brightness.

[0038] Based on the above, the data writing circuit 110 is electrically coupled to the data line DL for receiving the scanning signal S1[N] and the data voltage VDAT...

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PUM

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Abstract

The invention discloses a pixel circuit which comprises a first data writing circuit, a second data writing circuit, a first voltage stabilizing circuit, a second voltage stabilizing circuit, a firstcompensation circuit, a second compensation circuit, a first driving circuit, a second driving circuit, a reset circuit, a first light emitting diode and a second light emitting diode. The first datawriting circuit is used for receiving a first scanning signal and a data voltage. The second data writing circuit is used for receiving the second scanning signal and the data voltage. The first driving circuit is coupled to the first node and the first compensation circuit for receiving a reference voltage. The second driving circuit is coupled to the second node and the second compensation circuit and used for receiving the reference voltage. The reset circuit is coupled to the first drive circuit and the second drive circuit for receiving the first control signal.

Description

technical field [0001] The disclosed document relates to a pixel circuit, in particular to a pixel circuit capable of compensating variations in the threshold voltage of a driving transistor. Background technique [0002] Low temperature poly-silicon thin-film transistor (LTPS TFT) 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. At present, an excimer laser annealing (ELA) technique is widely used in the industry to form a polysilicon film of a low temperature polysilicon thin film transistor. 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. [0003] For example, low temperature polysilicon thin film transistors in different regi...

Claims

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Application Information

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IPC IPC(8): G09G3/3208
CPCG09G3/3208
Inventor 林志隆陈力荣陈柏勳陈柏澍郑贸薰
Owner AU OPTRONICS CORP
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