Goa circuit and embedded touch display panel
AssigneeWuhan China Star Optoelectronics Technology Co., Ltd.
InventorQiang GONG
Life of this patent
Estimating the term…
Abstract
A GOA circuit and an embedded touch display panel are provided. By providing an abnormity protection module in the nth-level GOA unit, the level of the scanning signal of the nth-level GOA unit is pulled up when the embedded touch display panel is powered off abnormally. The risk of abnormal display resulted from the residual of charges in pixels due to the abnormal power-off of the GOA circuit is reduced.
Claims20
A GOA (Gate driver On Array) circuit applied in an embedded touch display panel, comprising multiple levels of GOA units which are cascaded with each other, the nth-level GOA unit comprising a forward/reverse scanning control module, a node control module, an output module, an output control module, and an abnormity protection module;
- wherein
- the forward/reverse scanning control module is configured to output a first node control signal at a first node and output a second node control signal at a second node according to a forward scanning DC control signal and a reverse scanning DC control signal;
- the node control module is coupled to the first node and the second node and configured to pull the first node control signal down to a constant-voltage low level and pull the second node control signal up to a constant-voltage high level;
- the output module is coupled to the first node and electrically connected to a first clock signal and configured to output a scanning signal according to the first node control signal and the first clock signal;
- the output control module is electrically connected to the first control signal and configured to control the level of the scanning signal according to the first control signal;
- and
- the abnormity protection module is coupled to an output end of the output module and electrically connected to a second control signal, and configured to pull the level of the scanning signal up when the embedded touch display panel is powered off abnormally;
- wherein the abnormity protection module comprises a second thin-film transistor;
- and
- the second control signal is applied to a source and a gate of the second thin-film transistor, and a drain of the second thin-film transistor is connected to the output end of the output module;
- when the GOA circuit scans forward, the forward scanning DC control signal is in high level and the reverse scanning DC control signal is in low level;
- and when the GOA circuit scans reversely, the forward scanning DC control signal is in low level and the reverse scanning DC control signal is in high level.
A GOA (Gate driver On Array) circuit applied in an embedded touch display panel, comprising multiple levels of GOA units which are cascaded with each other, the nth-level GOA unit comprising a forward/reverse scanning control module, a node control module, an output module, an output control module, and an abnormity protection module;
- wherein
- the forward/reverse scanning control module is configured to output a first node control signal at a first node and output a second node control signal at a second node according to a forward scanning DC control signal and a reverse scanning DC control signal;
- the node control module is coupled to the first node and the second node and configured to pull the first node control signal down to a constant-voltage low level and pull the second node control signal up to a constant-voltage high level;
- the output module is coupled to the first node and electrically connected to a first clock signal and configured to output a scanning signal according to the first node control signal and the first clock signal;
- the output control module is electrically connected to the first control signal and configured to control the level of the scanning signal according to the first control signal;
- and
- the abnormity protection module is coupled to an output end of the output module and electrically connected to a second control signal, and configured to pull the level of the scanning signal up when the embedded touch display panel is powered off abnormally.
An embedded touch display panel, comprising a GOA circuit, wherein the GOA circuit is configured to be applied in an embedded touch display panel and comprises multiple levels of GOA units which are cascaded with each other, the nth-level GOA unit comprising a forward/reverse scanning control module, a node control module, an output module, an output control module, and an abnormity protection module;
- wherein
- the forward/reverse scanning control module is configured to output a first node control signal at a first node and output a second node control signal at a second node according to a forward scanning DC control signal and a reverse scanning DC control signal;
- the node control module is coupled to the first node and the second node and configured to pull the first node control signal down to a constant-voltage low level and pull the second node control signal up to a constant-voltage high level;
- the output module is coupled to the first node and electrically connected to a first clock signal and configured to output a scanning signal according to the first node control signal and the first clock signal;
- the output control module is electrically connected to the first control signal and configured to control the level of the scanning signal according to the first control signal;
- and
- the abnormity protection module is coupled to an output end of the output module and electrically connected to a second control signal, and configured to pull the level of the scanning signal up when the embedded touch display panel is powered off abnormally.
Dependencies are inferred from the claim text.