Patent ID: 9595235
Date: 2017-03-14
CPC Classifications: G09G

Claim:
1. A scan driving circuit for driving a plurality of scan lines, comprising: a pull controlling module for receiving a transferring signal from a previous one stage and a transferring signal from a previous two stage, and for generating scan level signal based on the transferring signal from the previous one stage and the transferring signal from the previous two stage; a pull-up module, for pulling up scan signal of one of the plurality of scan lines based on the scan level signal and a clock signal at a current stage; a pull-down module, for pulling down the scan signal based on a transferring signal of a next stage; a pull-down holding module, for holding the scan signal at a low level; a transferring module, for sending a transferring signal of the current stage to a pull controlling module at the next stage; a first bootstrap capacitor, for generating a high voltage level for the scan signal; a constant low voltage level source for supplying low voltage level to pull down; and a reset module for reset operation of the scan level signal at the current stage; wherein the pull controlling module comprises: a second bootstrap capacitor for pre-pulling up the scan level signal through the transferring signal from the previous two stage, and pulling up the scan level signal through the transferring signal from the previous one stage; a first transistor, comprising a controlling terminal receiving the transferring signal from the previous one stage, an input terminal connecting to the second bootstrap capacitor, and an output terminal connecting to the pull-up module, the pull-down module, the pull-down holding module, the transferring module and the second bootstrap capacitor.