Liquid crystal display device and electronic device

Patent metadata

Field	Value
Publication number	US-9500916-B2
Application number	US-201414337731-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Jul 25, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A flicker of an FFS liquid crystal display device that is driven at a low refresh rate is reduced. In an FFS liquid crystal display, a pixel electrode and a first common electrode included in a liquid crystal element are formed on an element substrate side, and a second common electrode is formed on another substrate (counter substrate) side. By making the first and second common electrodes have the same potential, generation of a residual DC voltage can be suppressed in a pixel. Thus, even when a refresh rate is lowered, change in transmittance of a pixel can be suppressed in a data retention period, so that a flicker can be reduced.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a first substrate;
a transistor over the first substrate;
a source line electrically connected to the transistor;
a first insulating layer over the transistor;
a first common electrode over the first insulating layer;
a second insulating layer over the first common electrode;
a pixel electrode over the second insulating layer;
a liquid crystal layer over the pixel electrode;
a second common electrod…

Assignees

• Semiconductor Energy Lab

Inventors

• Fukai Shuji
• Hatsumi Ryo
• Kubota Daisuke

Classifications

• G02F1/133345

  Physics · mapped topic

• H10D30/6755

  Electricity · mapped topic

• G02F1/134363 Primary

  Physics · mapped topic

• G02F2001/134372

  Physics · mapped topic

• G02F2001/134381

  Physics · mapped topic