Goa circuit for in-cell type touch display panel

Abstract

The invention discloses a GOA circuit for in-cell type touch display panel; during black screen, using a first global control signal to make a thirteenth N-type TFT conductive to raise a scan driving signal of each stage to high, using the first global control signal to make a twelfth N-type TFT conductive to pull down a voltage level of a second node, and pulling down a voltage level of a first node to avoid ineffective all-gate-on function; using a reset signal and a fourteenth N-type TFT to reset the second node to realize the normal output after awaking from black screen; during stop, setting a negative voltage as a pulse signal having same amplitude, phase and frequency as a touch signal, using a second global control signal to make the fifteenth N-type TFT conductive to output the negative voltage in pulse form to reduce cross-talk between the touch signal and a scan output end.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the field of liquid crystal display (LCD), and in particular to a gate driver on array (GOA) circuit for in-cell type touch display panel.[0003]2. The Related Arts[0004]The gate driver on array (GOA) technology is the array substrate column drive technology, by using the thin film transistor (TFT) liquid crystal display (LCD) array processor to manufacture the gate scan driver circuit on the TFT array substrate to realize the column-by-column scan driving. The GOA technology has the advantages of low manufacture cost and the ability to realize narrow-border panels, and is used by many types of displays. GOA circuit has two basic functions: first, to output scan driving signal to drive the gate line in the panel to turn on the TFT in the display area so as to charge the pixels; and the second is the shift bit saving; when the N-th scan driving signal is outputted, the clock control is use...

AI Technical Summary

Benefits of technology

The present invention provides a GOA circuit for in-cell type touch display panel that improves circuit stability and reduces cross-talk between the touch signal and the scan driving signal during stop duration. The circuit includes multiple cascade GOA units, each containing a forward and backward scan control module, a first node pull-down control module, a second node control module, a second node reset module, a stop-duration output control module, a black-screen-duration output control module, and a normal-display-duration output control module. The stop-duration output control module includes a thirteenth N-type TFT and a negative voltage to reduce cross-talk between the touch signal and the scan output end. The circuit also includes a reset signal and a fourteenth N-type TFT to reset the second node and a negative voltage to output a pulse signal during the stop duration to reduce cross-talk between the touch signal and the scan output end.

Problems solved by technology

However, the all-gate-on function may not stay in effecting in the current single-type GOA circuit.

The risk of electricity leakage exists in the current single-type GOA circuit when performing signal stop.

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