IP Library Granted Patent US 7,403,255
Granted Patent B2
US 7,403,255 · App. 11/730,721 · Granted Jul 22, 2008

Liquid crystal display device

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Quick Facts
Patent No.
US 7,403,255
App. No.
11/730,721
Filed
Apr 3, 2007
Granted
Jul 22, 2008
Kind
B2
Art Unit
2871
USPC
349/141
Abstract

Below a transparent pixel electrode, an opaque pixel electrode is arranged while sandwiching an insulation film between the transparent pixel electrode and the opaque pixel electrode. A common electrode is arranged below the opaque pixel electrode thus forming a holding capacitance between the common electrode and an opaque metal electrode. In case when the pixel is divided into four or more portions, an interval between the pixel electrode and the common electrode is set to an unequal pitch size or an unequal electrode width within one pixel.

Claims (8)

1. An active matrix type liquid crystal display device including a liquid crystal layer sandwiched between a transparent first substrate and a transparent second substrate, wherein

a plurality of gate lines and a plurality of drain lines which intersect the plurality of gate lines in a matrix array are formed over the first substrate,

a pixel region is defined in a region surrounded by the plurality of gate lines and the plurality of drain lines, and

the pixel region includes a common electrode, a TFT element and a pixel electrode, wherein

the common electrode is formed over the gate line and the drain line by way of an insulation film, the common electrode is wider than the gate line and the drain line,

the pixel electrode is formed over the same layer as the common electrode and is formed of a transparent conductive body having a width narrower than a width of the common electrode, and

ends of the pixel electrode are shielded from light by a metal electrodes and the metal electrode is arranged in a lower layer of the insulation film and an electric potential of the metal electrode is the same as an electric potential of the pixel electrode.

2. An active matrix type liquid crystal display device according to claim 1 , wherein the metal electrode is narrower than the pixel electrode, and the pixel electrode is formed of a transparent conductor.