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TFT threshold voltage compensation circuit and method, shift register and display device

A shift register and compensation circuit technology, applied in the field of shift registers, display devices, and thin film transistor threshold voltage compensation circuits, can solve problems such as inconsistent threshold voltages, offsets, and inability to work.

Active Publication Date: 2015-09-09
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a TFT threshold voltage offset compensation circuit and method, a shift register, and a display device, which are used to solve the problem of inconsistency or offset of the current threshold voltage of the thin film transistor at the output end in the existing shift register. work problem

Method used

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  • TFT threshold voltage compensation circuit and method, shift register and display device
  • TFT threshold voltage compensation circuit and method, shift register and display device
  • TFT threshold voltage compensation circuit and method, shift register and display device

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Embodiment 1

[0030] Such as image 3 As shown, it is a TFT threshold voltage compensation circuit in Embodiment 1 of the present invention, which includes: an input terminal, an output terminal connected to the source of the thin film transistor, the first resistor R1 to the Kth resistor RK connected in series in sequence, The Kth connectable link and at least one first connectable link, the K is a positive integer greater than 1, image 3 The Kth connectable link and the first connectable link are marked by adding a solid circle inside a hollow circle; where,

[0031] The Kth connectable link, which corresponds to the Kth resistor, is set between the input terminal and the output terminal, and is used for when the current threshold voltage of the thin film transistor is consistent with the set standard threshold voltage, Turning on the connection between the input terminal and the output terminal, and disconnecting the connection between the input terminal and the output terminal when th...

Embodiment 2

[0050] Embodiment 2 of the present invention provides a shift register, and the shift register includes: an output terminal thin film transistor for controlling the output signal of the output terminal of the shift register;

[0051] Wherein, the source of the thin film transistor at the output end is connected to the thin film transistor threshold voltage compensation circuit described in Embodiment 1, and under the action of the compensation circuit, the gate and source of the thin film transistor at the output end The voltage difference is equal to its current threshold voltage.

[0052] Figure 5 The shown shift register composed of N-type TFTs is a shift register according to Embodiment 2 of the present invention. The thin film transistor at the output end of the shift register is M4, and its source is connected to the thin film transistor described in Embodiment 1. Transistor threshold voltage compensation circuit, therefore, if M4 is an amorphous silicon N-type TFT, if...

Embodiment 3

[0057] Embodiment 3 of the present invention provides a method for performing threshold voltage compensation on the compensation circuit described in Embodiment 1. The method includes:

[0058] When the current threshold voltage of the thin film transistor is consistent with the set standard threshold voltage, the connection between the input terminal and the output terminal is turned on; when the current threshold voltage of the thin film transistor is inconsistent with the set standard threshold voltage, the input terminal is disconnected. The connection between the terminal and the output terminal;

[0059] And when the current threshold voltage of the thin film transistor is inconsistent with the set standard threshold voltage, disconnect or conduct the connection between the output terminal and the kth resistor, where k is a positive value greater than or equal to 1 and less than or equal to K-1 integer.

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Abstract

Provided are a threshold voltage compensation circuit of TFT and a method for the same, a shift register and a display device. The threshold voltage compensation circuit includes an input terminal, an output terminal connected to the source of the thin film transistor, a first resistor to a Kth resistor connected in series, and Kth connectable link and at least one first connectable link. Since a voltage dividing circuit having connectable links divides the voltage input to the source of the thin film transistor, such that the gate-source voltage of the thin film transistor can be changed by changing the voltage of the source of the thin film transistor when the voltage of the gate of the thin film transistor is maintained unchanged, so as to control a leakage current of the thin film transistor under a turn-off state, such that the thin film transistor can be turned off normally.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a thin film transistor (Thin Film Transistor, TFT) threshold voltage compensation circuit and method, a shift register and a display device. Background technique [0002] Gate-driver on Array (GOA) technology can utilize TFTs to realize the circuit function of a shift register, and integrate the shift register on the pixel array substrate. GOA and the pixel substrate can be completed under the same process technology, thus simplifying the production process of the entire display device. [0003] Although the GOA technology has the above advantages, its current problem is that the shift register integrated on the array substrate is highly dependent on the characteristics of the TFT, especially the current threshold voltage of the TFT has a huge impact on the stability of the shift register. . This is because the non-uniformity of the current threshold voltage or the dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C19/28G09G3/20
CPCG11C19/28G09G3/3241G09G2320/045G09G2300/043G09G2310/0286
Inventor 梁逸南马利飞皇甫鲁江
Owner BOE TECH GRP CO LTD
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