# US 7,746,442 B2 · Liquid crystal display device

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- Number: US 7,746,442 B2
- Document ID: US7746442B2
- Status: Granted
- Kind: B2
- Application number: 11/373,997
- Filed: 2006-03-14
- Published: 2006-08-03
- Granted: 2010-06-29
- Earliest claimed: 2002-11-12
- Assignees: LG Display Co., Ltd.
- Inventors: Yong Sang Byun; Kyung Su Chae
- Web page: https://patentgrep.com/patent/US7746442B2

## CPC

- G02F 1/133371: {Cells with varying thickness of the liquid crystal layer}
- G02F 1/13394: {spacers regularly patterned on the cell subtrate, e.g. walls, pillars (G02F1/133377 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

A liquid crystal display device including opposite first and second substrates, and column spacers between the first and second substrates, the column spacers formed such that the column spacers differ in size as positions of the column spacers differ, thereby accommodating the variation in gap between substrates when liquid crystal is concentrated at a lower end of the display due to gravity when a large LCD panel is in a vertical position.

## Claims

### Claim 1

A liquid crystal display device comprising:
opposite first and second substrates; and
column spacers between the first and second substrates, wherein the column spacers formed on one of the substrates such that the height of the column spacers differ as position of the column spacers differ,
wherein the height of the column spacers differ as the position of the column spacers differ according to the expansion ratio of the cell gap between the first and second substrates due to gravity when the display device is in a vertical position,
wherein the column spacers with great height are positioned lower only than the column spacers with small height.

### Claim 2 (depends on 1)

The liquid crystal display device according to claim 1, wherein the column spacers have two or more different heights.

### Claim 3 (depends on 1)

The liquid crystal display device according to claim 1, wherein the column spacers are formed of photo acryl.

### Claim 4 (depends on 1)

The liquid crystal display device according to claim 1, wherein the column spacers are formed by an ink jet method.

### Claim 5 (depends on 1)

The liquid crystal display device according to claim 1, wherein the height of the column spacers increases as it goes farther from an upper end to a lower end of the display device.

### Claim 6 (depends on 1)

The liquid crystal display device according to claim 1, wherein the column spacers in an upper end of the display device have a 3.5 μm height and the column spacers in a lower end of the display device have a 4 to 4.5 μm height.

### Claim 7 (depends on 1)

The liquid crystal display device according to claim 1, wherein the column spacers in an upper part have a height different from the column spacers at a lower end of the display device by less than 1 μm.

### Claim 8

A liquid crystal display device comprising:
a thin film transistor substrate and a color filter substrate boned to each other; and
at least two groups of column spacers, in different areas from each other, on one of the thin film transistor substrate and the color film substrate, wherein a height and a diameter of the at least one group of the column spacers is different from those of the other group of the column spacers, wherein the group of column spacers with the greatest height and diameter is located nearer to a bottom of the liquid crystal display device and the other group of column spacers is located nearer to a top of the liquid crystal display device due to gravity when the LCD device is in a vertical position,
wherein the group of column spacers with great height and diameter are positioned lower only than the other group of column spacers of small height and diameter.