Adaptive voltage source, shift register and its unit, and a display

A technology of self-adapting voltage and sensing unit, which is applied in the fields of shift registers and their units, self-adapting voltage sources, and displays, can solve the problems of difficult to prolong the life of the circuit, excessively fast drift of the threshold voltage of the related TFT, etc., so as to prevent the drift of the threshold voltage. Too fast, the effect of prolonging life

Active Publication Date: 2017-10-31
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the current GOA circuit, the driving method in which the high level of the clock signal is constant causes the relevant TFT threshold voltage to drift too fast, and the circuit life is difficult to prolong

Method used

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  • Adaptive voltage source, shift register and its unit, and a display
  • Adaptive voltage source, shift register and its unit, and a display
  • Adaptive voltage source, shift register and its unit, and a display

Examples

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Effect test

Embodiment 1

[0050] Please refer to image 3 , is the structural diagram of the self-adaptive voltage source of this embodiment. The adaptive voltage source structure includes: for the voltage source V in series H The sensing module 1 and the reference resistor between the low level end and the low level end form a circuit. Wherein, the sensing module 1 includes a sensing unit TD3, which is preferably a triode. In other embodiments, the sensing unit TD3 may also be composed of other transistors such as diodes by connecting / coupling with other elements to function as a triode. In this embodiment, the sensing unit TD3 is taken as an example of a thin film transistor for illustration. The control electrode (such as the gate) of the sensing unit TD3 is the sensing terminal of the sensing module 1, which is used to be coupled to the transistor Tx to be sensed. In the sensing device circuit The threshold voltage shift of the transistor Tx to be sensed.

[0051] In a specific embodiment, the c...

Embodiment 2

[0073] The adaptive voltage source disclosed in Embodiment 1 is applicable to any device circuit that adjusts the supply voltage based on the threshold voltage of a transistor, and a shift register unit is taken as an example for illustration. Please refer to Figure 7 , is a circuit structure diagram of the shift register unit disclosed in this embodiment. The shift register unit includes: a driving module 20 , an input module 10 , a low level maintaining module 30 and the aforementioned adaptive voltage source 40 . in,

[0074] The driving module 20 is configured to convert the first signal V through the switch state A It is transmitted to the signal output end of the shift register unit, thereby outputting the scan signal. After the drive control terminal Q is charged to obtain the drive voltage, the first signal V A Signal output to the shift register unit. In a specific embodiment, the driving module 20 may include a second transistor T2 for coupling to the signal ou...

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Abstract

The application discloses an adaptive voltage source, including: a signal output terminal, a reference resistance forming circuit and a sensing module connected in series between the voltage source and a low level. The sensing module includes a sensing terminal, which is used for coupling to the transistor to be sensed and used for sensing the threshold voltage drift of the transistor to be sensed in the circuit of the device; the equivalent resistance of the sensing module increases as the sensed threshold voltage drift increases. The signal output terminal is coupled to the first node coupled to the reference resistance forming circuit and the sensing module, and is used for outputting an adaptive voltage. The threshold voltage shift sensed by the sensing module is used to adjust the output adaptive voltage. Based on the circuit, the application also discloses a shift register, its unit and a display.

Description

technical field [0001] The application relates to the field of electronic circuits, in particular to an adaptive voltage source, a shift register and its unit, and a display. Background technique [0002] In recent years, narrow bezel display technology has developed rapidly, and has gradually become the mainstream flat panel display technology. Especially for small and medium-sized thin-film transistor (TFT) displays such as smartphones and tablets, the narrow bezel display technology is more widely used. The core of the narrow bezel display technology is the gate-driver on array (GOA for short) design of TFT integration. After using the GOA circuit, not only can the frame size of the display be significantly reduced, making the entire TFT display panel more compact and beautiful, but also the number of row and column driver chips on the TFT panel and the corresponding number of connecting wires can be reduced. In addition, the subsequent packaging process of the display ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G3/36G09G3/3208G09G3/34G11C19/28
CPCG05F1/625G09G3/20G09G2300/0408G09G2310/0267G09G2310/0286G09G2310/0289G11C19/184G09G3/2092G09G2310/0275G09G2310/08G09G2330/021
Inventor 张盛东廖聪维胡治晋李文杰李君梅
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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