Gate driver and shift register

摘要

A gate driver has a plurality of shift registers. Each of the shift registers has at least three input terminals, two signal input terminals, a pull-up circuit, a driving circuit, a stability pull-down control circuit, and a stability pull-down circuit. The three input terminals of each shift register receive three different clock signals. Accordingly, the driving circuit and the stability pull-down control circuit of each shift register are controlled according to the three clock signals, such that a glitch causing by the coupling effect of the parasitic capacitor of the driving circuit is avoided and the stability of the gate driver is improved.

主权项

1. A shift register comprising:
a first input terminal configured to receive a first clock signal; a second input terminal configured to receive a second clock signal; a third input terminal configured to receive a third clock signal; a first input signal terminal configured to receive a first input signal; a second input signal terminal configured to receive a second input signal; a pull-up circuit coupled to a first node, the first input signal terminal and the second input signal terminal for pulling up a voltage level of the first node according to the first input signal, the second input signal, a first selective control signal, and a second selective control signal; a driving circuit coupled to the first input terminal, an output terminal of the shift register, and the first node for controlling an electrical connection between the first input terminal and the output terminal according to the voltage level of the first node; a stability pull-down control circuit comprising:
a first switch having a first terminal coupled to a second node of the shift register, a second terminal coupled to a system voltage terminal of the shift register, and a control terminal coupled to the first node;a second switch having a first terminal configured to receive the first selective control signal, a second terminal coupled to the second node, and a control terminal coupled to the second input terminal; anda third switch having a first terminal configured to receive the second selective control signal, a second terminal coupled to the second node, and a control terminal coupled to the third input terminal; and a stability pull-down circuit coupled to the first node, the second node, the output terminal and the system voltage terminal for controlling an electrical connection between the first node and the output terminal and an electrical connection between the output terminal and the system voltage terminal according to a voltage level of the second node.