Patent ID: 9208737
Filing Date: 2015-12-08
Classification: G09G

Abstract:
1. A shift register comprising: a first input terminal; a second input terminal; a third input terminal; a fourth input terminal; a first signal input terminal; a first output terminal; a first system voltage terminal; a second system voltage terminal; a pull-up circuit coupled to the first signal input terminal and a first node for pulling up a voltage level of the first node according to a voltage level of the first signal input terminal; a driving circuit coupled to the first node, the first input terminal and the first output terminal for controlling the electrical connection between the first input terminal and the first output terminal according to the voltage level of the first node; a stability driving circuit comprising: a capacitor having a first terminal directly coupled to the first node and a second terminal directly coupled to a second node; a first switch having a first terminal directly coupled to the second system voltage terminal, a second terminal directly coupled to the second node, and a control terminal directly coupled to the first input terminal; a second switch having a first terminal directly coupled to the second system voltage terminal, a second terminal directly coupled to the second node, and a control terminal directly coupled to the second input terminal; a third switch having a first terminal directly coupled to the second node, a second terminal directly coupled the first system voltage terminal, and a control terminal directly coupled to the third input terminal; and a fourth switch having a first terminal directly coupled to the second node, a second terminal directly coupled to the first system voltage terminal, and a control terminal directly coupled to the fourth input terminal; and a pull-down circuit coupled to the first node, the first output terminal, the first system voltage terminal and the fourth input terminal for pulling down the voltage level of the first node and the first output terminal according to a voltage level of the fourth input terminal, wherein: