# US 8,786,809 B2 · Liquid crystal display and manufacturing method thereof

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- Number: US 8,786,809 B2
- Document ID: US8786809B2
- Status: Granted
- Kind: B2
- Application number: 13/277,348
- Filed: 2011-10-20
- Published: 2012-12-20
- Granted: 2014-07-22
- Earliest claimed: 2011-06-20
- Assignees: Samsung Display Co., Ltd.
- Applicants: Kyoung Tae Kim; Kyoung Ju Shin; Jun Woo Lee; Suk Hoon Kang; Baek Kyun Jeon; Young-Gu Kim
- Inventors: Kyoung Tae Kim; Kyoung Ju Shin; Jun Woo Lee; Suk Hoon Kang; Baek Kyun Jeon; Young-Gu Kim
- Web page: https://patentgrep.com/patent/US8786809B2

## CPC

- G02F 1/133788: {by light irradiation, e.g. linearly polarised light photo-polymerisation}
- G02F 1/133753: {with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle}
- G02F 1/133757: {with different alignment orientations}
- G02F 1/133761: {with different pretilt angles}
- G02F 1/133773: {the alignment material or treatment being different for the two opposite substrates}
- 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, a pretilt value provided by an upper alignment layer or a lower alignment layer is gradually changed in one domain, such that liquid crystal molecules have various arrangements in which azimuth angles of aligned liquid crystal molecules are gradually changed.

## Claims

### Claim 1

A liquid crystal display, comprising:
a plurality of pixel regions each including a plurality of domains;
a lower panel including a lower substrate, and a lower alignment layer on the lower substrate and including a pretilt;
an upper panel including an upper substrate and an upper alignment layer disposed on the upper substrate and including a pretilt; and
a vertical alignment mode liquid crystal layer between the lower panel and the upper panel, and having a plurality of liquid crystal molecules,
wherein
liquid crystal molecules which are adjacent to the upper alignment layer or the lower alignment layer are arranged by a respective pretilt, and
the pretilt of the lower alignment layer or the upper alignment layer is gradually changed along a first direction from a side to an opposite side in each of the plurality of domains of the plurality of pixel regions in a plan view, and is the same in each of the plurality of domains of the plurality of pixel regions along a second direction perpendicular to the first direction in the plan view.

### Claim 2 (depends on 1)

The liquid crystal display of claim 1, wherein:
the liquid crystal molecules adjacent to the lower alignment layer are arranged by a first pretilt in one of the plurality of domains,
the liquid crystal molecules adjacent to the upper alignment layer are arranged by a second pretilt in the one of the plurality of domains, and
the first pretilt is changed within a first range and the second pretilt is changed within a second range.

### Claim 3 (depends on 2)

The liquid crystal display of claim 2, wherein:
the first range of the first pretilt and the second range of the second pretilt are the same as each other.

### Claim 4 (depends on 3)

The liquid crystal display of claim 3, wherein:
azimuth angle directions or first short-axis directions of the plurality of liquid crystal molecules in the one of the plurality of domains are connected to each other to form a curved line.

### Claim 5 (depends on 3)

The liquid crystal display of claim 3, wherein:
an azimuth angle of the plurality of liquid crystal molecules in the one of the plurality of domains has a fan shape.

### Claim 6 (depends on 3)

The liquid crystal display of claim 3, wherein:
azimuth angle directions or first short-axis directions of the liquid crystal molecules along the center of the fan shape are arranged in a straight line.

### Claim 7 (depends on 6)

The liquid crystal display of claim 6, wherein:
the straight line forms an angle of 45 degrees with one side of the lower substrate or the upper substrate.

### Claim 8 (depends on 2)

The liquid crystal display of claim 2, wherein:
the first range of the first pretilt and the second range of the second pretilt are different from each other.

### Claim 9 (depends on 8)

The liquid crystal display of claim 8, wherein:
azimuth angle directions or first short-axis directions of the plurality of liquid crystal molecules in the one of the plurality of domains are arranged in a curved line.

### Claim 10 (depends on 8)

The liquid crystal display of claim 8, wherein:
an azimuth angle of the plurality of liquid crystal molecules in the one of the plurality of domains has a fan shape.

### Claim 11 (depends on 8)

The liquid crystal display of claim 8, wherein:
azimuth angle directions or first short-axis directions of the liquid crystal molecules along the center of the fan shape are arranged in a straight line.

### Claim 12 (depends on 1)

The liquid crystal display of claim 1, further comprising:
a pixel includes a high gray display subpixel and a low gray display subpixel,
wherein
the high gray display subpixel and the low gray display subpixel, each has four domains, and
the plurality of liquid crystal molecules adjacent to the lower alignment layer and the lower alignment layer in the four domains are respectively arranged by the gradually changed pretilt.

### Claim 13 (depends on 12)

The liquid crystal display of claim 12, wherein:
azimuth angle directions or first short-axis directions of the plurality of liquid crystal molecules in each of the domains are arranged in a curved line.

### Claim 14 (depends on 12)

The liquid crystal display of claim 12, wherein:
an azimuth angle of the plurality of liquid crystal molecules in each of the domains has a fan shape.

### Claim 15 (depends on 12)

The liquid crystal display of claim 12, wherein:
azimuth angle directions or first short-axis directions of the liquid crystal molecules along the center of the fan shape are arranged in a straight line.