goa circuit and display panel

Abstract

A GOA circuit and a display panel: the GOA circuit, by means of the improved design of a pull-down maintenance circuit unit (350), can effectively prevent a 51st switch transistor (T51) and a 53rd switch transistor (T53) in the pull-down maintenance circuit unit (350) from being affected by large current stress, thereby reducing the threshold voltage offset thereof, such that the pull-down maintenance circuit unit (350) can work normally for a long time, ensuring that the scan signal outputs a normal waveform.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a GOA circuit and a display panel. Background technique [0002] Liquid crystal display panels have become display panels for mobile communication devices, PCs, TVs, etc. due to their high display quality, low price, and easy portability. At present, the driving technology of liquid crystal display panels tends to adopt GOA circuits. GOA circuits can simplify the manufacturing process of flat panel display panels and eliminate the bonding process in the direction of horizontal scanning lines, which can increase production capacity and reduce product costs. At the same time, it can improve display panels. The high level of integration makes it more suitable for making display products with narrow bezel or bezel-less, satisfying the visual pursuit of modern people. [0003] GOA circuit, that is, Gate Driver on Array technology, is to use the existing liquid crystal display panel ...

AI Technical Summary

Problems solved by technology

However, both the gate terminal and the drain terminal of the light-on transistor T51 in the pull-down maintenance circuit unit 150 receive the clock signal CKn, and the clock signal CKn is a high-level signal. Therefore, the difference between the drain terminal voltage and the source terminal voltage of the switch transistor T51 Vds will be very large. When the Vds is larger, the current stress of the switch tube T51 will be more serious, so the switch tube T51 will be affected by the forward current stress for a long time, resulting in a serious shift of its threshold voltage Vth and electrical failure. , the same situation exists in the light-on tube T53, which will affect the pull-down sustain signal Pn and the switch tube T43, and cause the pull-down sustain circuit unit to fail to work normally, so that the output waveform of the scan level signal Qn will become seriously attenuated, and then Affects the waveform output of the scan signal Gn at the current level

[0005] In view of this, it is necessary to provide a new type of GOA circuit that can overcome the severe threshold voltage shift caused by the switch tube TFT in the pull-down maintenance circuit unit of the existing GOA circuit being easily affected by the forward current stress and affecting the waveform output of the scanning signal And other issues

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