Scan driving circuit
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorJuncheng Xiao
Life of this patent
Estimating the term…
Abstract
A scan driving circuit is provided. The scan driving circuit includes a pull-up control module, a pull-up module, a pull-down module, a pull-down maintenance module, a bootstrap capacitor, and a low-level constant source. The pull-up control module herein is respectively coupled to the pull-up module, the pull-down module, the pull-down maintenance module, and the bootstrap capacitor; the low-level constant source is respectively coupled to the pull-down maintenance module and the pull-down module. The present invention can avoid a leakage phenomenon well and improve reliability of the scan driving circuit.
Claims20
A scan driving circuit for driving a scan line of cascaded stages, comprising:
- a pull-up control module utilized to receive a scanning signal of a previous stage, and to generate a scan level signal of the corresponding scan line according to the scanning signal of the previous stage;
- a pull-up module utilized to lift a scanning signal of a present stage of the corresponding scan line according to the scan level signal and a clock signal of the present stage;
- a pull-down module utilized to lower the scan level signal of the corresponding scan line according to a scanning signal of a next stage;
- a pull-down maintenance module utilized to maintain a low level of the scan level signal of the corresponding scan line;
- a bootstrap capacitor utilized to a high level of the scanning signal of the present stage of the scan line;
- a reset module utilized to reset the scan level signal of the present stage of the scan line;
- and
- a low-level constant source utilized to provide a pull-down low level;
- wherein the pull-up control module is respectively coupled to the pull-up module, the pull-down module, the pull-down maintenance module, and the bootstrap capacitor;
- the low-level constant source is respectively coupled to the pull-down maintenance module and the pull-down module;
- wherein the pull-up control module further comprises a first switch, the scanning signal of the previous stage being input to a control terminal of the first switch, the scanning signal of the previous stage being input to an input terminal the first switch, an output terminal of the first switch respectively coupled to the pull-up module, the pull-down module, the pull-down maintain module, and the bootstrap capacitor.
A scan driving circuit for driving a plurality of scan lines of cascaded stages, comprising:
- a pull-up control module utilized to receive a scanning signal of a previous stage, and to generate a scan level signal of the corresponding scan line according to the scanning signal of the previous stage;
- a pull-up module utilized to lift a scanning signal of a present stage of the corresponding scan line according to the scan level signal and a clock signal of the present stage;
- a pull-down module utilized to lower the scan level signal of the corresponding scan line according to a scanning signal of a next stage;
- a pull-down maintenance module utilized to maintain a low level of the scan level signal of the corresponding scan line;
- a bootstrap capacitor utilized to a high level of the scanning signal of the present stage of the scan line;
- and
- a low-level constant source utilized to provide a pull-down low level;
- wherein the pull-up control module is respectively coupled to the pull-up module, the pull-down module, the pull-down maintenance module, and the bootstrap capacitor;
- the low-level constant source is respectively coupled to the pull-down maintenance module and the pull-down module.
Dependencies are inferred from the claim text.