goa circuit and its driving method, touch display device

Abstract

Embodiments of the present invention provide a GOA circuit, its driving method, and a touch display device, which relate to the field of display technology and are used to solve the problem that the shift registers of several stages that need to be started after the touch scan phase are pulled up during the touch scan phase. Leakage occurs at the node, resulting in the problem of fixed position H line phenomenon. In the GOA circuit, the first input end of the first to N / 2 level GOA units is connected to the first signal end; except for the first to N / 2 level GOA units, the first input end of the Mth level GOA unit is connected to the first input end of the Mth level GOA unit. The output end of the (M‑N / 2) level GOA unit is connected; except for the last N / 2 level GOA unit, the second input end of the Mth level GOA unit is connected to the output end of the (M+N / 2) level GOA unit Connection; the second input terminal of the last N / 2 level GOA unit is connected to the second signal terminal; N represents the number of clock signals in one clock cycle; the pull-up node potential holding unit of the GOA circuit includes N / 2 cascaded GOAs unit, the output terminal of the GOA unit in the pull-up node potential holding unit does not output the gate line scanning signal.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a GOA circuit, a driving method thereof, and a touch display device. Background technique [0002] In order to pursue higher cost and narrow frame of LCD (Liquid Crystal Display), more and more existing LCD products adopt GOA (Gate Driver on Array, array substrate row drive) technology, that is, directly integrate the thin film transistor (Thin Film Transistor, TFT) is fabricated on the array (Array) substrate, thereby eliminating the space occupation of the IC (Integrated Circuit, Integrated Circuit) bonding (Bonding) and fan-out (Fan-Out) area, realizing the material and manufacturing The cost reduction in process and other aspects and the narrowing of the borders on both sides of the Panel grid line. The touch screen has multiple advantages such as multifunctionality of operation and ease of use. With the continuous reduction of the price of the touch screen and the ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the existence of the touch scan time, the voltage of the pull-up node PU of the first few GOA units after the touch scan period will attenuate due to the leakage of the TFT during the touch scan period, resulting in that after the touch scan period, The gate open signals output by the output terminals of these GOA units are weakened, that is, the output gate open signals are different from those of other GOA units, resulting in the fixed position H line phenomenon in the pixel area, resulting in poor display

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