# US 2019/0171071 A1 · Display device and method

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0171071 A1
- Document ID: US20190171071A1
- Status: Published application
- Kind: A1
- Application number: 16/268,204
- Filed: 2019-02-05
- Published: 2019-06-06
- Earliest claimed: 2014-05-30
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Tae KUROKAWA; Akira Sakaigawa; Masaaki Kabe; Kojiro Ikeda; Amane Higashi
- Web page: https://patentgrep.com/patent/US20190171071A1

## CPC

- G02F 1/134336: {Matrix}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy}
- 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

According to one embodiment, a display device includes a display panel, a light source, a light guide and a prism sheet. The display panel includes a display area in which unit pixels each containing first sub-pixels and second sub-pixels are arranged along a first direction and a second direction. In the display area, the first sub-pixels have a width different from that of the second sub-pixel in at least one of the first direction and the second direction, or each unit pixel contains different numbers of first sub-pixels and second sub-pixels. The prism sheet is interposed between the light guide and the display panel and includes prisms extending along a third direction inclined with respect to the second direction by an acute angle of inclination.

## Claims

### Claim 1

A display device comprising:
a display panel comprising a display area in which first pixels and second pixels are arranged along a first direction and a second direction intersecting the first direction;
a light source;
a light guide comprising an end portion opposing the light source; and.
a prism sheet interposed between the light guide and the display panel and comprising a plurality of prisms extending along a third direction inclined with respect to the second direction by an acute angle of inclination, wherein
each of the first pixels includes a first red sub-pixel, a first green sub-pixel and a blue sub-pixel,
each of the second pixels includes a second red sub-pixel, a second green sub-pixel and a white sub-pixel,
when an angle made between an extending direction of the prisms and the second direction while a luminance distribution of the sub-pixels in the display area is in a most uniform state is defined as an ideal angle, a first ideal angle specific to a first sub-pixel having a highest luminance among the first red sub-pixel, the second red sub-pixel, the first green sub-pixel, the second green sub-pixel, the blue sub-pixel and the white sub-pixel is different from a second ideal angle specific to a second. sub-pixel having a second highest luminance among the first red sub-pixel, the second red sub-pixel, the first green sub-pixel, the second green sub-pixel, the blue sub-pixel and the white sub-pixel, and
the acute angle of inclination is an average of the first ideal angle and the second ideal angle.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the average is a weighted average according to a first luminance of the first sub-pixel and a second luminance of the second sub-pixel.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the average is a weighted average according to a value obtained by multiplying the first luminance of the first sub-pixel with a first coefficient other than the first luminance regarding the first sub-pixel and a value obtained by multiplying the second luminance of the second sub-pixel with a second coefficient other than the second luminance regarding the second sub-pixel.

### Claim 4

A display device comprising:
a display panel comprising a display area in which first pixels and second pixels are arranged along a first direction and a second direction intersecting the first direction;
light source;
a light guide comprising an end portion opposing the light source; and
a prism sheet interposed between the light guide and the display panel and comprising a plurality of prisms linearly extending and arranged at a constant prism pitch, wherein
each of the first pixels includes a first red sub-pixel, a first green sub-pixel and a blue sub-pixel,
each of the second pixels includes a second red sub-pixel, a second green sub-pixel and a white sub-pixel,
when a prism pitch by which a luminance distribution of the sub-pixels in the display area is in a most uniform. state is defined as an ideal pitch, a first ideal pitch specific to a first sub-pixel having a highest luminance among the first red sub-pixel, the second red sub-pixel, the first green sub-pixel, the second green sub-pixel, the blue sub-pixel and the white sub-pixel is different from a second ideal pitch specific to a second sub-pixel having a second highest luminance among the first red sub-pixel, the second red sub-pixel, the first green sub-pixel, the second green sub-pixel, the blue sub-pixel and the white sub-pixel, and
the constant prism pitch is an average of the first ideal pitch and the second ideal pitch.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the average is a weighted average according to a first luminance of the first sub-pixel and a second luminance of the second sub-pixel.

### Claim 6 (depends on 4)

The display device of claim 4, wherein the average is a weighted average according to a value obtained by multiplying the first luminance of the first sub-pixel with a first coefficient other than the first luminance regarding the first sub-pixel and a value obtained by multiplying the second luminance of the second sub-pixel with a second coefficient other than the second luminance regarding the second sub-pixel.