# US 11,079,633 B2 · Liquid crystal display apparatus

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- Number: US 11,079,633 B2
- Document ID: US11079633B2
- Status: Granted
- Kind: B2
- Application number: 16/885,944
- Filed: 2020-05-28
- Published: 2020-12-03
- Granted: 2021-08-03
- Earliest claimed: 2019-05-29
- Assignees: Sakai Display Products Corporation; Sharp Kabushiki Kaisha
- Applicants: Sakai Display Products Corporation; Sharp Kabushiki Kaisha
- Inventors: Mitsuaki Hirata; Fumikazu Shimoshikiryoh
- Web page: https://patentgrep.com/patent/US11079633B2

## CPC

- G02F 1/133753: {with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle}
- G02F 1/1337: Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F 1/133707: {Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes}
- G02F 1/133757: {with different alignment orientations}
- G02F 1/133788: {by light irradiation, e.g. linearly polarised light photo-polymerisation}
- G02F 1/133742: {for homeotropic alignment}
- G02F 1/133761: {with different pretilt angles}
- G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy}
- G02F 2201/123: pixel
- 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 apparatus includes first and second substrates and a liquid crystal layer of vertical alignment type. The first substrate includes pixel electrodes and a first alignment film, whereas the second substrate includes a counter electrode and a second alignment film. Each pixel includes first and second subpixels which allow respectively different voltages to be applied across the liquid crystal layer. Each pixel electrode includes first and second subpixel electrodes. Each of the first and second subpixels includes first to fourth liquid crystal domains having respectively different reference alignment directions being defined by the first and second alignment films. First to fourth directions, which are the reference alignment directions of the first to fourth liquid crystal domains, each make an angle which is substantially equal to an odd multiple of 45° with respect to the pixel transverse direction.

## Claims

### Claim 1

A liquid crystal display apparatus comprising:
a first substrate and a second substrate opposing each other; and
a liquid crystal layer of vertical alignment type provided between the first substrate and the second substrate,
the liquid crystal display apparatus having a plurality of pixels, wherein,
the first substrate includes a pixel electrode provided for each of the plurality of pixels, and a first alignment film provided between the pixel electrodes and the liquid crystal layer;
the second substrate includes a counter electrode opposing the pixel electrodes, and a second alignment film provided between the counter electrode and the liquid crystal layer;
each of the plurality of pixels includes a first subpixel and a second subpixel which allow respectively different voltages to be applied across the liquid crystal layer;
the pixel electrode of each pixel includes a first subpixel electrode provided for the first subpixel and a second subpixel electrode provided for the second subpixel;
each of the first subpixel and the second subpixel includes a first liquid crystal domain, a second liquid crystal domain, a third liquid crystal domain, and a fourth liquid crystal domain, each liquid crystal domain having a reference alignment direction defined by the first alignment film and the second alignment film, and the first to fourth liquid crystal domains having respectively different reference alignment directions;
a longitudinal direction and a transverse direction of each of the plurality of pixels respectively define a pixel longitudinal direction and a pixel transverse direction of that pixel, and the reference alignment directions of the first liquid crystal domain, the second liquid crystal domain, the third liquid crystal domain, and the fourth liquid crystal domain respectively define a first direction, a second direction, a third direction, and a fourth direction;
the first direction, the second direction, the third direction, and the fourth direction each make an angle which is substantially equal to an odd multiple of 45° with respect to the pixel transverse direction of each pixel;
in each pixel, each of the first subpixel electrode and the second subpixel electrode includes: a first slit which is formed in a region corresponding to the first liquid crystal domain and which extends substantially in parallel to the first direction; a second slit which is formed in a region corresponding to the second liquid crystal domain and which extends substantially in parallel to the second direction; a third slit which is formed in a region corresponding to the third liquid crystal domain and which extends substantially in parallel to the third direction; and a fourth slit which is formed in a region corresponding to the fourth liquid crystal domain and which extends substantially in parallel to the fourth direction;
in each of the first subpixel and the second subpixel, the first liquid crystal domain, the second liquid crystal domain, the third liquid crystal domain, and the fourth liquid crystal domain are arranged in this order along the pixel longitudinal direction of the pixel;
the first subpixel and the second subpixel adjoin each other along the pixel transverse direction; and
a boundary between the first subpixel and the second subpixel includes a portion which is substantially parallel to the first slit, a portion which is substantially parallel to the second slit, a portion which is substantially parallel to the third slit, and a portion which is substantially parallel to the fourth slit.

### Claim 2 (depends on 1)

The liquid crystal display apparatus of claim 1, wherein, when an azimuth angle of the pixel transverse direction of each pixel is defined as 0°, the first direction, the second direction, the third direction, and the fourth direction are, respectively, substantially the 225° direction, substantially the 135° direction, substantially the 315° direction, and substantially the 45° direction.

### Claim 3 (depends on 1)

The liquid crystal display apparatus of claim 1, wherein, when an azimuth angle of the pixel transverse direction of each pixel is defined as 0°, the first direction, the second direction, the third direction, and the fourth direction are, respectively, substantially the 315° direction, substantially the 45° direction, substantially the 225° direction, and substantially the 135° direction.

### Claim 4 (depends on 1)

The liquid crystal display apparatus of claim 1, wherein each of the first alignment film and the second alignment film is a photo-alignment film.

### Claim 5 (depends on 1)

The liquid crystal display apparatus of claim 1, wherein, in each of the first liquid crystal domain, the second liquid crystal domain, the third liquid crystal domain, and the fourth liquid crystal domain of each pixel, a pretilt direction that is defined by the first alignment film and a pretilt direction that is defined by the second alignment film are substantially antiparallel.