Scan driving circuit

摘要

A scan driving circuit is disclosed and used to execute a driving operation for cascaded scan lines. The scan driving circuit has a pull-down control module, a pull-down module, a pull-up module, a pull-up maintaining module, a bootstrap capacitor, a constant low-level voltage source and a constant high-level voltage source; the scan driving circuit uses a PMOS type transistor to control the pull-down control module, the pull-down module, the pull-up module and the pull-up maintaining module. The scan driving circuit has a simple overall structure and lower energy consumption.

主权项

1. A scan driving circuit, executing a driving operation for cascaded scan lines, comprising:
a pull-down control module receiving a previous-level scan signal, and generating a low-level scan level signal corresponding to one of the scan lines according to the previous-level scan signal; a pull-down module pulling down a scan signal of the corresponding scan line according to the scan level signal and a first clock signal; a pull-up module pulling up the scan signal of the corresponding scan line according to a low-level signal and a high-level signal; a pull-up maintaining module keeping the scan level signal of the corresponding scan line in a high-level according to the low-level signal and the high-level signal; a bootstrap capacitor generating a low-level or a high-level of the scan level signal of the scan line; a constant low-level voltage source providing the low-level signal; and a constant high-level voltage source providing the high-level signal; wherein the scan driving circuit uses a P-metal-oxide-semiconductor (PMOS) type transistor to control the pull-down control module, the pull-down module, the pull-up module and the pull-up maintaining module; wherein the pull-down control module includes a first switch transistor, a control end of the first switch transistor inputs the previous-level scan signal, an input end of the first switch transistor inputs a low-level scan signal, and an output end of the first switch transistor is connected to the pull-down module, the pull-up maintaining module and the bootstrap capacitor respectively; wherein the pull-up maintaining module includes a second electrical potential maintaining capacitor, one end of the second electrical potential maintaining capacitor is connected to the constant high-level voltage source, and the other end of the second electrical potential maintaining capacitor is connected to the output end of the first switch transistor.