Shift register unit, shift register, array substrate and display device

Abstract

The invention discloses a shift register unit, a shift register, an array substrate and a display device. The shift register unit comprises a level control module, wherein the level control module is connected with a grid signal generating module and comprises a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor and a fifth thin film transistor; the drain electrode of the first thin film transistor is respectively connected with the source electrode of the second thin film transistor and the grid electrode of the fourth thin film transistor; the grid electrode of the second thin film transistor is connected with the grid electrode of the third thin film transistor; the drain electrode of the third thin film transistor is respectively connected with the source electrode of the fourth thin film transistor and the grid electrode of the fifth thin film transistor; and the source electrode of the fifth thin film transistor is respectively connected with the drain electrode of the second thin film transistor and the source electrode of the third thin film transistor. According to the invention, when the shift register unit is not selected, the level of a grid line can be kept in a low state, and thus the service life of the shift register is ensured.

Description

technical field [0001] The invention relates to liquid crystal display technology, in particular to a shift register unit, a shift register and an array substrate and a display device applied thereto. Background technique [0002] In recent years, with the vigorous development of semiconductor technology, portable electronic products and flat panel display products are also emerging. Moreover, thin film transistor (TFT, Thin Film Transistor) liquid crystal display has gradually become a standard output device for various data products due to its advantages of low operating voltage, no radiation scattering, light weight, and small size. A TFT liquid crystal display is generally composed of a matrix of pixels arranged in both horizontal and vertical directions. When a TFT liquid crystal display is displayed, a gate input signal is generated through a shift register, and each row of pixels is scanned sequentially from the first row to the last row. When designing a TFT liquid ...

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Problems solved by technology

[0005] For this reason, a circuit design scheme of a shift register is proposed, figure 1 A schematic diagram of the circuit structure of the shift register unit for this design, such as figure 1 As shown, the circuit consists of thirteen TFTs made of amorphous silicon and a capacitor. figure 1 Although the shown shift register can slow down the movement of the threshold voltage of the TFT to a certain extent, when the first clock signal input terminal (CLK) outputs a high-level signal, there will be a current on the thin film transistor M5, resulting in The power consumption of the whole circuit is relatively large, therefore, in figure 1 On the basis of the circuit shown, improvements have been made to reduce the power consumption of the entire circuit. The circuit structure of the improved shift register unit is as follows figure 2 shown

[0006] Although the above two circuit design schemes can slow down the movement of the threshold voltage of the TFT to a certain extent, there are still technical defects in the above two circuit design schemes. Specifically, the shift register unit designed by using the above two circuits, Only when the second clock signal input terminal (CLK B) is a high-level signal, the potential of the gate line can be pulled down, that is: the potential of the output terminal (OUTPUT) of the shift register unit, and when the first clock signal input terminal When (CLK) is a high-level signal, the potential of the gate line cannot be pulled down. In this way, the noise of the circuit will be large, which will cause the function of the circuit to be disordered. For example, one line will output several pulse signals, etc., which will cause Reduced working life of shift registers

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