Goa circuit for in-cell type touch display panel

a touch display panel and circuit technology, applied in the field of liquid crystal display, can solve the problems of current single-type goa circuit risk of electricity leakage, and the all-gate-on function may not stay in effect, so as to reduce cross-talk

a touch display panel and circuit technology, applied in the field of liquid crystal display, can solve the problems of current single-type goa circuit risk of electricity leakage, and the all-gate-on function may not stay in effect, so as to reduce cross-talk

US20170102805A1Active Publication Date: 2017-04-13WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Goa circuit for in-cell type touch display panel
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  • Goa circuit for in-cell type touch display panel

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Embodiment Construction

[0028]To further explain the technical means and effect of the present invention, the following refers to embodiments and drawings for detailed description.

[0029]Refer to FIG. 1, and also FIG. 6 and FIG. 7. the present invention provides a GOA circuit for in-cell type touch display panel, which comprises: a plurality of cascade GOA units, N being a positive integer, the N-th stage GOA unit further comprising: a forward and backward scan control module 1, a first node pull-down control module 2, a second node control module 3, a second node reset module 4, a stop-duration output control module 5, a black-screen-duration output control module 6, and a normal-display-duration output control module 7.

[0030]The forward and backward scan control module 1 comprises: a first N-type TFT T1, a gate of the first N-type TFT T1 being connected to the scan output end G(Nāˆ’2) of the GOA unit of an (Nāˆ’2)-th stage, a source connected to a forward scan signal U2D, and a drain connected to the first no...

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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...

Claims

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Application Information

Patent Timeline
13 Apr 2017
Publication
US20170102805A1
IPC
G06F3/041
CPC
G06F2203/04103; G06F3/0412; G09G3/20; G09G2310/0245; G09G2310/0267; G09G2310/0283; G09G2310/0286; G09G2354/00
Inventors
XIAO, JUNCHENG; CAO, SHANGCAO