# US 7,609,350 B2 · Liquid crystal display

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- Number: US 7,609,350 B2
- Document ID: US7609350B2
- Status: Granted
- Kind: B2
- Application number: 11/523,612
- Filed: 2006-09-20
- Published: 2007-01-18
- Granted: 2009-10-27
- Earliest claimed: 2002-09-13
- Assignees: NEC LCD Technologies, Ltd.
- Inventors: Shingo Saigo; Takasuke Hayase; Makoto Horinouchi; Hideto Motoshima; Akitoshi Maeda
- Web page: https://patentgrep.com/patent/US7609350B2

## CPC

- G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]}
- G02F 1/136227: {Through-hole connection of the pixel electrode to the active element through an insulation layer}
- G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A display portion is divided by scan lines and signal lines into sections where pixels are provided. Contact holes each for connecting common wiring and a common electrode together are not formed for all the pixels, but decimated so as to be arranged in zigzags.

## Claims

### Claim 1

An in-plane switching liquid crystal display, comprising:
thin film transistors on a substrate,
scan lines and signal lines connected to the thin film transistors and longitudinally and latitudinally crossing each other,
common wiring formed by the same layer as the scan lines and generating electric fields substantially parallel to the substrate between a common electrode connected to the common wiring and covering at least the signal lines partially via an interlayer insulating film formed on the thin film transistors,
a pixel electrode connected to the thin film transistors, and
contact holes connecting the common wiring and the common electrode to each other and are formed at a ratio of one contact hole to a plurality of the pixels with respect to the pixels divided and defined by the scan lines and the signal lines.

### Claim 2 (depends on 1)

A liquid crystal display according to claim 1, wherein:
when seeing, from one pixel formed with the contact hole, other pixels formed with the contact holes, respectively, and located around the one pixel, the other pixels are arranged at an interval of at least one pixel in longitudinal and latitudinal directions from the one pixel.