# US 5,345,324 A · Active matrix liquid crystal display device having two light shielding layers

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- Number: US 5,345,324 A
- Document ID: US5345324A
- Status: Granted
- Kind: A
- Application number: 08/049,784
- Filed: 1993-04-19
- Granted: 1994-09-06
- Earliest claimed: 1992-04-22
- Assignees: International Business Machines Corporation
- Inventors: Toshihiko Koseki; Tetsuya Fukunaga; Hideo Takano; Hidemine Yamanaka
- Web page: https://patentgrep.com/patent/US5345324A

## CPC

- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/13373: {Disclination line; Reverse tilt}
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes 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

In a liquid crystal display device including a first transparent insulating substrate having a common electode formed theron; a second transparent insulating substrate having gate lines formed in a first direction; data lines formed in a second direction so as to intersect said gate lines, liquid crystal display cells, each at a crosspoint of said gate and data lines; the cells having a thin film transistor and a display electrode; a light shielding layer having an aperture for exposing a display area of each display electrode; a liquid crystal material retained between said first and second substrates, and a liquid crystal orientating layer on at least one of the substrates, the improvement comprising, the light shielding layer at an edge of said aperture being located in an up stream direction with respect to a rubbing direction of the orientating layer of the substrate, comprising a thin light shielding layer formed at a periphery of the display electrode for defining an edge of the aperture, and a thick light shielding layer having an edge positioned on the thin light shielding layer.

## Claims

### Claim 1

In a liquid crystal display device including a first transparent insulating substrate having a common electrode formed thereon, a second transparent insulating substrate having gate lines formed in a first direction, data lines formed in a second direction so as to intersect said gate lines, liquid crystal display cells each formed at a crosspoint of said gate and data lines, said cell having a thin film transistor and a display electrode; and a light shielding layer having an aperture for exposing a display area of each display electrode; liquid crystal material retained between said first and second substrates, and a liquid crystal orientating layer on at least one of said substrates the improvement comprising:
said light shielding layer at an edge of said aperture being located in an up stream direction with respect to a rubbing direction of said orientating layer of said substrate, comprising a thin light shielding layer formed at a periphery of said display electrode for defining an edge of said aperture, and a thick light shielding layer having an edge positioned on said thin light shielding layer.

### Claim 2 (depends on 1)

A liquid crystal display device according to claim 1, wherein said thin light shielding layer blocks light passing through reverse tilted liquid crystal molecules.

### Claim 3 (depends on 2)

A liquid crystal display according to claim 2, wherein a thickness of said thin light shielding layer is equal to or less than 0.5 um.

### Claim 4 (depends on 1)

A liquid crystal display device according to claim 1, wherein said thin light shielding layer is a metal layer and said thick light shielding layer is a black colored photoresist layer.

### Claim 5 (depends on 4)

A liquid crystal display device according to claim 4, wherein said metal layer is an extension of a metal layer used for said gate line.

### Claim 6 (depends on 4)

A liquid crystal display device according to claim 4, wherein said metal layer is an extension of a metal layer used for said data line.

### Claim 7 (depends on 4)

A liquid crystal display device according to claim 4, wherein said photoresist layer includes blue pigments, yellow pigments and violet pigments.

### Claim 8 (depends on 4)

A liquid crystal display device according to claim 4, wherein said photoresist layer including red pigments, blue pigments, yellow pigments and violet pigments.