Gate shift register and display device comprising the same

Patent metadata

Field	Value
Publication number	US-8994629-B2
Application number	US-201213710043-A
Country	US
Kind code	B2
Filing date	Dec 10, 2012
Priority date	Sep 27, 2012
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

According to an embodiment, a gate shift register includes a plurality of stages cascade-connected to each other. An nth one of the stages includes: a pull-up transistor that outputs any one of gate shift clocks as an nth scan pulse of a gate high voltage in accordance with the potential of a Q node; a pull-down transistor that is connected to the pull-up transistor through an output node, and outputs a low-potential voltage as an nth scan pulse of a gate low voltage in accordance with the potential of a QB node; and a switching circuit that charges and discharges the Q node and the QB node, respectively, or vice versa in response to a set signal and a reset signal, wherein an adaptively adjusted variable high-potential voltage is applied to the QB node to correspond to a shift in the threshold voltage of the pull-down transistor.

First claim

What is claimed is:

1. A display device comprising a gate shift register, the display device comprising:
a display panel;
a gate shift register comprising a plurality of stages cascade-connected to each other and sequentially supplying scan pulses to scan lines of the display panel;
a threshold voltage sensing circuit comprising a monitoring TFT and a detection TFT and outing a sensed voltage; and
a VDD regulator circuit that calculates a threshold voltage of a pull-down tra…

Assignees

• Lg Display Co Ltd

Inventors

• Kim Binn

Classifications

• G09G3/3677

  Physics · mapped topic

• G09G2370/08

  Physics · mapped topic

• G11C19/28

  Physics · mapped topic

• G09G2330/02

  Physics · mapped topic

• G09G3/22

  Physics · mapped topic