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US 2019/0164514 A1Published application
Gate Driver on Array Circuit and In-Cell Touch Display Panel
AssigneeWuhan China Star Optoelectronics Technology Co., Ltd.
InventorQiang GONG
Life of this patent
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Abstract
The present disclosure proposes an in-cell touch display panel and a gate driver on array (GOA) circuit. A pre-charging circuit is arranged on an nth stage GOA unit circuit of the GOA circuit and the in-cell touch display panel. A first node controlling signal on a first node of an (n+2)th stage GOA unit circuit is pre-charged, reducing a risk of failure of stage-by-stage signal transmitting arising from poor holding voltage of the GOA unit circuit during the signal suspending and improving reliability of the GOA circuit.
Claims20
A gate driver on array (GOA) circuit, applying to an in-cell touch display panel, comprising:
- a plurality of cascaded GOA unit circuits;
- an nth stage GOA unit circuit comprising:
- a forward/reverse-scanning controlling circuit, a node controlling circuit, an output circuit, an output controlling circuit, and a pre-charging circuit;
- the forward/reverse-scanning controlling circuit, configured to output a first node controlling signal at a first node and a second node controlling signal at a second node according to a forward-scanning direct current controlling signal and a reverse-scanning direct current controlling signal;
- the node controlling circuit, coupled to the first node and the second node, and configured to pull the first node controlling signal down to a constant-voltage low voltage level and raise the second node controlling signal to a constant-voltage high voltage level;
- the output circuit, 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 controlling signal and the first clock signal;
- the output controlling circuit, electrically connected to the first controlling signal and configured to pull the scanning signal down to the constant-voltage low voltage level according to the first controlling signal;
- the pre-charging circuit, coupled to the first node and electrically connected to the first node of an (n+2)th stage GOA unit circuit, configured to pre-charge the first node controlling signal on the first node of the (n+2)th stage GOA unit circuit when the in-cell touch display panel is under a stage of signal suspending and touch scanning;
- the pre-charging circuit comprises a first third thin-film transistor (TFT) and a second TFT;
- a gate and a source of the first TFT being both connected to the first node;
- a drain of the first TFT being connected to a source of the second TFT, a drain of the second TFT being connected to the first node of the (n+2)th stage GOA unit circuit;
- a gate of the second TFT receiving the first controlling signal;
- when the in-cell touch display panel displays normally, the first controlling signal being at a low voltage level;
- when the in-cell touch display panel is under the stage of signal suspending and touch scanning, the first controlling signal being at a high voltage level.
11 more elements
A gate driver on array (GOA) circuit, applying to an in-cell touch display panel, comprising:
- a plurality of cascaded GOA unit circuits;
- an nth stage GOA unit circuit comprising:
- a forward/reverse-scanning controlling circuit, a node controlling circuit, an output circuit, an output controlling circuit, and a pre-charging circuit;
- the forward/reverse-scanning controlling circuit, configured to output a first node controlling signal at a first node and a second node controlling signal at a second node according to a forward-scanning direct current controlling signal and a reverse-scanning direct current controlling signal;
- the node controlling circuit, coupled to the first node and the second node, and configured to pull the first node controlling signal down to a constant-voltage low voltage level and raise the second node controlling signal to a constant-voltage high voltage level;
- the output circuit, 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 controlling signal and the first clock signal;
- the output controlling circuit, electrically connected to the first controlling signal and configured to pull the scanning signal down to the constant-voltage low voltage level according to the first controlling signal;
- the pre-charging circuit, coupled to the first node and electrically connected to the first node of an (n+2)th stage GOA unit circuit, configured to pre-charge the first node controlling signal on the first node of the (n+2)th stage GOA unit circuit when the in-cell touch display panel is under a stage of signal suspending and touch scanning.
5 more elements
An in-cell touch display panel comprising a gate driver on array (GOA) circuit, the GOA circuit comprising:
- a plurality of cascaded GOA unit circuits;
- an nth stage GOA unit circuit comprising:
- a forward/reverse-scanning controlling circuit, a node controlling circuit, an output circuit, an output controlling circuit, and a pre-charging circuit;
- the forward/reverse-scanning controlling circuit, configured to output a first node controlling signal at a first node and a second node controlling signal at a second node according to a forward-scanning direct current controlling signal and a reverse-scanning direct current controlling signal;
- the node controlling circuit, coupled to the first node and the second node, and configured to pull the first node controlling signal down to a constant-voltage low voltage level and raise the second node controlling signal to a constant-voltage high voltage level;
- the output circuit, 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 controlling signal and the first clock signal;
- the output controlling circuit, electrically connected to the first controlling signal and configured to pull the scanning signal down to the constant-voltage low voltage level according to the first controlling signal;
- the pre-charging circuit, coupled to the first node and electrically connected to the first node of an (n+2)th stage GOA unit circuit, configured to pre-charge the first node controlling signal on the first node of the (n+2)th stage GOA unit circuit when the in-cell touch display panel is under a stage of signal suspending and touch scanning.
5 more elements
Dependencies are inferred from the claim text.