# US 6,724,454 B2 · Ips lcd device having a light shielding layer under at least one common or data electrodes so that light transmittance areas of the common and data electrodes are the same and a method of manufacturing the same

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- Number: US 6,724,454 B2
- Document ID: US6724454B2
- Status: Granted
- Kind: B2
- Application number: 09/892,879
- Filed: 2001-06-28
- Published: 2002-04-25
- Granted: 2004-04-20
- Earliest claimed: 2000-10-20
- Assignees: LG.Philips LCD Co., Ltd.
- Inventors: Gi Hong Kim; Yun Bok Lee
- Web page: https://patentgrep.com/patent/US6724454B2

## CPC

- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]}
- G02F 1/133397: {for suppressing after-image or image-sticking}
- G02F 1/136286: {Wiring, e.g. gate line, drain line}
- G02F 2201/122: having a particular pattern
- 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

An in-plane switching mode LCD having an improved picture quality comprises first and second substrates; a plurality of pixel areas defined on the first substrate; data electrodes and common electrodes alternately formed in each of the pixel areas and patterned to have the same light transmitting area according to the applied voltage; and a liquid crystal layer between the first and second substrates. A method of manufacturing the in-plane switching mode LCD comprises: preparing the first and second substrates; forming a plurality of gate lines and data lines on the first substrate to define a plurality of pixel areas; forming a plurality of data electrodes and common electrodes to alternate in each pixel areas and have the same light transmitting area in applying voltage; and forming a liquid crystal layer between the first and second substrates.

## Claims

### Claim 1

An in-plane switching liquid crystal display device, comprising:
first and second substrates;
a plurality of data lines on the first substrate;
a plurality of gate lines crossing the data lines on the first substrate, perpendicular to the data lines;
a plurality of pixel areas on said first substrate defined by the data and gate lines;
data electrodes and common electrodes alternately formed in each of said pixel areas, the data electrodes having a first transmittance area and the common electrodes having a second transmittance area, wherein at least one light shielding lever is formed on the first substrate under at least one of the common electrodes, wherein a number of common electrodes having no light shielding layer thereunder is equal to a number of data electrodes having no light shielding layer thereunder so that the first transmittance area equals the second transmittance area; and
a liquid crystal layer between said first and second substrates.

### Claim 2 (depends on 1)

The in-plane switching liquid crystal display device of claim 1, wherein the data electrodes and the common electrodes are on different layers.

### Claim 3 (depends on 1)

The in-plane switching liquid crystal display device of claim 1, wherein the light shielding layer and the gate lines comprise a same material.

### Claim 4 (depends on 1)

The in-plane switching liquid crystal display device of claim 1, wherein the light shielding layer and the data lines comprise a same material.

### Claim 5 (depends on 1)

The in-plane switching liquid crystal display device of claim 1, further comprising at least one light shielding layer under at last one of the data electrodes so that light transmittance of the common electrodes is the same as light transmittance through the data electrodes.

### Claim 6 (depends on 5)

The in-plane switching liquid crystal display device of claim 5, wherein the at least one light shielding layer and the gate lines comprise a same material.

### Claim 7 (depends on 5)

The in-plane switching liquid crystal display device of claim 5, wherein the at least one shielding layer and the data lines comprise a same material.

### Claim 8 (depends on 1)

The in-plane switching liquid crystal display device of claim 1, wherein the common electrodes include at least one outermost common electrode adjacent to at least one of said data lines; and
wherein the light shielding layer is formed under the at least one outermost common electrode.

### Claim 9

An in-plane switching liquid crystal display device, comprising:
first and second substrates;
a plurality of pixel areas on said first substrate;
data electrodes and common electrodes alternately formed in each of said pixel areas and patterned, wherein a light shielding layer is formed under at least one of said data electrodes, wherein a number of data electrodes having no light shielding layer thereunder is equal to a number of common electrodes having no light shielding layer thereunder so that the data electrodes and common electrodes have a same light transmitting area according to an applied voltage; and
a liquid crystal layer between said first an second substrates.

### Claim 10 (depends on 9)

The device of claim 9, wherein said data electrodes and said common electrodes are formed on planes different from each other.

### Claim 11 (depends on 10)

The device of claim 10, further comprising an insulation film on the data electrodes.

### Claim 12 (depends on 9)

The device of claim 9, further comprising a light shielding layer for shielding outermost ones of said common electrodes.

### Claim 13 (depends on 12)

The device of claim 12, wherein said light shielding layer is formed under said outermost ones of said common electrodes.

### Claim 14 (depends on 9)

The device of claim 9, wherein said data electrodes and said common electrodes are a stripe type.

### Claim 15

A method of manufacturing an in-plane switching liquid crystal display device comprising:
preparing first and second substrates;
forming a plurality of gate lines and data lines on the first substrate to define a plurality of pixel areas;
forming an insulation film over a surface of the pixel areas including the gate lines;
forming light shielding layers having a predetermined width on the insulation film;
forming a plurality of data electrodes and common electrodes having an alternating pattern in each of the pixel areas, wherein at least one of the light shielding layers is formed under at least one of the data electrodes so that the plurality of data electrodes and common electrodes have a same light transmitting area; and
forming a liquid crystal layer between the first and second substrates.

### Claim 16 (depends on 15)

The method of claim 15, wherein said forming a plurality of data electrodes and common electrodes includes:
forming a first protective film on the surface of the pixel areas including the light shielding layers;
forming a plurality of data electrodes on the first protective film corresponding to areas between the light shielding layers;
forming a second protective film on the surface of the pixel areas including the data electrodes; and
forming a plurality of common electrodes on the second protective film corresponding to areas between adjacent ones of the data electrodes.

### Claim 17 (depends on 16)

The method of claim 16, wherein outermost ones of the plurality of common electrodes in the pixel areas are substantially vertically aligned with corresponding light shielding layers.

### Claim 18 (depends on 15)

The method of claim 15, wherein said light shielding layers are formed of the same material as the data lines.

### Claim 19 (depends on 15)

The method of claim 15, wherein the light shielding layers are formed of the same material as the data lines.

### Claim 20 (depends on 15)

The method of claim 15, wherein the data electrodes and the common electrodes are formed of a transparent conductive material.

### Claim 21 (depends on 20)

The method of claim 20, wherein the transparent conductive material is ITO.