SHIFT REGISTER CIRCUIT AND SHIFT REGISTER

摘要

A shift register circuit has a plurality of shift registers. Each of the shift registers has at least four input terminals, a signal input terminal, an output terminal, a pull-up circuit, a driving circuit, a stability driving circuit, and a pull-down circuit. The signal input terminal receives an input signal, and the pull-up circuit is configured to pull up a voltage level of a node of the shift register. The driving circuit outputs a gate driving signal according to the voltage level of the node. The pull-down circuit is configured to pull down the voltage level of the node. The stability driving circuit can pull down the voltage of the output terminal according to the voltages of the four input terminals, and, thus, can reduce the response time of the shift register circuit and increase the operation region of the shift register circuit.

主权项

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 coupled to the first node and a second terminal coupled to a second node;a first switch having a first terminal coupled to the second system voltage terminal, a second terminal coupled to the second node, and a control terminal coupled to the first input terminal;a second switch having a first terminal coupled to the second system voltage terminal, a second terminal coupled to the second node, and a control terminal coupled to the second input terminal;a third switch having a first terminal coupled to the second node, a second terminal coupled the first system voltage terminal, and a control terminal coupled to the third input terminal; anda fourth switch having a first terminal coupled to the second node, a second terminal coupled to the first system voltage terminal, and a control terminal 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.