a goa circuit

Abstract

GOA circuit is disclosed comprising m stages GOA units, wherein a n-th stage GOA unit comprises: an output control module, a forward-backward scan control module, a node signal control module, a signal output module, a first pull-down circuit, a second pull-down circuit, and a pull-up circuit, wherein m≥n¢1; output control module controls a n-th stage gate driving signal; first pull-down circuit comprises a 7th thin-film-transistor which first end connected with said output control module, and second end connected with low voltage signal; signal output module comprises a 5th thin-film-transistor which first end connected with high voltage signal and second end connected with third end of said 7th thin-film-transistor; node signal control module controls said 5th thin-film-transistor as conducting or non-conducting; second pull-down circuit controls said 5th thin-film-transistor as non-conducting. Present invention eliminates the sticking and flicker of display panels after out of power improving user experience.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a GOA circuit. Background technique [0002] At present, liquid crystal display devices have been widely used in various electronic products as display components of electronic equipment, and a GOA (Gate Driver On Array, GOA for short) circuit is an important part of the liquid crystal display device. The GOA circuit is a technology that uses the existing thin-film transistor liquid crystal display array manufacturing process to manufacture the gate line scanning drive signal circuit on the array substrate to realize the drive mode of progressive scanning of the gate. [0003] Display panels based on Low Temperature Polysilicon (LTPS) technology can be divided into NMOS type, PMOS type, and both NMOS and PMOS according to the type of thin film transistor (Thin Film Transistor, TFT) used in the panel. type CMOS. Similarly, GOA circuits are divided into NMOS circuits, PMOS circu...

AI Technical Summary

Problems solved by technology

In the case of abnormal power failure, if the GOA circuit cannot effectively realize the All Gate ON function (that is, set all the gate driving signals in the GOA circuit to an effective potential to scan the liquid crystal display device at the same time), the panel will have afterimages.

[0004] For example, taking forward sweep as an example, in figure 1 In the GOA circuit unit shown, when an abnormal power-off is triggered, if the n+1th clock signal connected to the thin film transistor NT3 is at a high potential at this time, then the forward scanning control signal and the n+1th clock signal The potential will be pulled down to a low potential synchronously, and at the same time, the high potential of the gate of the thin film transistor NT5 cannot be released, thereby causing the thin film transistor NT5 to remain on, and at this time the thin film transistor NT8 is also in the on state, the high potential signal VGH and the low potential signal VGL Superimposed together, the gate of the thin film transistor NT7 cannot be pulled down completely, causing the thin film transistor NT7 to pull down the potential of the gate driving signal G(n) output to the thin film transistor of the pixel unit, so that the gate driving signal G(n) is not enough to turn on In the thin film transistor of the pixel unit, the charge of the pixel electrode cannot be released in time, which will cause residual image in the effective display area when the power is abnormally cut off

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