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Driving voltage compensation method and circuit of display

A technology of driving voltage and compensation method, applied in circuits, static indicators, instruments, etc., can solve problems such as leakage current Id drift, long-term voltage difference, flicker, etc., and achieve the effect of solving IV curve drift

Active Publication Date: 2019-04-19
XIANYANG CAIHONG OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the non-ideal structure of the TFT in the display area (AA area), because the TFT is at a low voltage on the gate for a long time, and a high voltage on the source and drain, resulting in a long-term voltage difference between the gate and the source / drain, in this long-term voltage In the worst case, the IV characteristics of the TFT will change, causing the leakage current Id to drift, resulting in a change in the leakage current Id under the same gate voltage, which will lead to a change in the leakage speed of the pixels in the AA area, and it is easy to produce image sticking and flicker question

Method used

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  • Driving voltage compensation method and circuit of display
  • Driving voltage compensation method and circuit of display

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Embodiment 1

[0039] See image 3 and Figure 4 , image 3 It is a schematic flowchart of a display driving voltage compensation method provided by an embodiment of the present invention, Figure 4 A schematic diagram of a position of a reference TFT provided for an embodiment of the present invention. The voltage compensation method of this embodiment can be applied to various displays using TFTs, such as OLED displays, LCD displays, etc., and its working principle is also applicable to other types of displays, without any limitation here. Specifically, the method includes:

[0040] Set the reference TFT;

[0041] obtaining the drive current of the reference TFT;

[0042] Obtaining a compensation voltage value according to the driving current;

[0043] The driving voltage of the TFT in the display area is compensated according to the compensation voltage value.

[0044] Wherein, in the display mode, the voltages of the source, drain, and gate of the reference TFT are the same as the...

Embodiment 2

[0054] Please refer to Figure 4 to Figure 8 , Figure 4A schematic diagram of the position of a reference TFT provided by the embodiment of the present invention, Figure 5 It is a schematic diagram of the establishment principle of a compensation comparison table provided by the embodiment of the present invention, Figure 6 It is a schematic diagram of the principle of a driving voltage compensation circuit in display mode provided by an embodiment of the present invention, Figure 7 It is a schematic diagram of the principle of a driving voltage compensation circuit in the detection compensation mode provided by the embodiment of the present invention, Figure 8 It is a timing schematic diagram of a driving voltage compensation circuit provided by an embodiment of the present invention. In this embodiment, on the basis of the above-mentioned embodiments, taking reference TFTs set in the dummy area and compensating all TFTs in the AA area as an example, the driving volta...

Embodiment 3

[0083] The embodiment of the present invention introduces a driving voltage compensation circuit based on the above method. See Figure 9 and see again Figure 6 and Figure 7 , Figure 9 A block diagram of a driving voltage compensation circuit provided by an embodiment of the present invention. The compensation circuit includes: a drive current detection module 10, a compensation voltage acquisition module 20, and a compensation module 30; wherein,

[0084] The driving current detection module 10 is used to obtain the driving current drift value of the TFT in the display area, including: a reference TFT 101, a control module 102, a level conversion unit 103, a driving current detection unit 104, and an ADC 105, wherein the control module 102 is connected with the driving current respectively. The circuit detection unit 104 is connected to the level conversion unit 103 , the reference TFT 101 is respectively connected to the drive current detection unit 104 and the level ...

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Abstract

The invention relates to a driving voltage compensation method and a circuit of a display. The method comprises the following steps: setting a reference TFT; acquiring driving current of the referenceTFT; acquiring a compensation voltage value according to the driving current; and compensating the driving voltage of the display region TFT according to the compensation voltage value. Through the driving voltage compensation method disclosed by the embodiment of the invention, an IV feature curve drifting condition of the display region TFT is acquired by arranging one reference TFT, and the compensation voltage value is acquired through a drifting value of the driving current, the driving voltage of the display region TFT is compensated, thereby solving the a display image ghost or flickering problem caused by the IV feature curve drifting of the TFT due to long-term voltage difference.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a driving voltage compensation method and circuit of a display. Background technique [0002] TFT (Thin Film Transistor) LCD is a thin film field effect transistor LCD, which is a kind of active matrix liquid crystal display (AM-LCD). Liquid crystal display, especially TFT-LCD, is currently the only display device that has fully caught up with and surpassed CRT in terms of brightness, contrast, power consumption, life, volume and weight. It has excellent performance, good mass production characteristics, and automatic High degree, low cost of raw materials, broad development space, will quickly become the mainstream product in the new century, is a bright spot of global economic growth in the 21st century. [0003] See figure 1 and figure 2 , figure 1 It is a schematic diagram of the working principle of the display area TFT in the prior art, figure 2 It is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3225G09G3/3648G09G2320/0257G09G2320/0247G09G3/2092G09G2300/08G09G2320/029G09G2320/043G09G2320/045G09G3/20G09G2300/043H01L27/124
Inventor 吴永良
Owner XIANYANG CAIHONG OPTOELECTRONICS TECH CO LTD
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