# US 12,216,304 B2 · Illumination device including light guide with tilted portion

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- Number: US 12,216,304 B2
- Document ID: US12216304B2
- Status: Granted
- Kind: B2
- Application number: 18/338,521
- Filed: 2023-06-21
- Published: 2023-10-19
- Granted: 2025-02-04
- Earliest claimed: 2021-03-31
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Shinichi Komura; Koichi Okuda; Ken Onoda; Hiroaki Kijima
- Web page: https://patentgrep.com/patent/US12216304B2

## CPC

- G02B 6/0018: {Redirecting means on the surface of the light guide}
- G02B 6/0028: {Light guide, e.g. taper}
- G02B 6/0031: {Reflecting element, sheet or layer}
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0045: {by shaping at least a portion of the light guide}
- G02B 6/0046: {Tapered light guide, e.g. wedge-shaped light guide}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02B 6/0091: {of the light source relative to the light guide (G02B6/0021 takes precedence)}
- G02B 6/0048: {with stepwise taper}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

According to an embodiment, an illumination device includes a light guide having a first plane, a second plane opposed to the first plane and substantially parallel to the first plane, and a tilted plane opposed to the first plane and tilted to the first plane, the tilted plane and the second plane being arranged in a first direction, and a light emitting device including a first light emitting part, a second light emitting part, and a third light emitting part which are located directly below the tilted plane, arranged in the first direction, and configured to emit light having wavelengths different from each other.

## Claims

### Claim 1

A display device comprising:
a light emitting device comprising a first light emitting part, a second light emitting part adjacent to the first light emitting part in a first direction, and a third light emitting part adjacent to the second light emitting part in the first direction;
a light guide comprising a tilted portion opposed to the light emitting device and including a plane tilted to the first direction, and an effective area portion configured to guide light made incident from the tilted portion and to emit light propagating inside the light guide; and
a liquid crystal panel configured to display images by selectively transmitting light emitted from the effective area portion of the light guide, wherein
a distance along the first direction from the first light emitting part to the third light emitting part is larger than a thickness of the effective area portion.

### Claim 2 (depends on 1)

The display device of claim 1, wherein
the first light emitting part, the second light emitting part, and the third light emitting part are configured to emit respective light of wavelengths different from each other.

### Claim 3 (depends on 1)

The display device of claim 1, wherein
the tilted portion has a constant thickness in a second direction crossing the first direction, and
a length of the tilted portion along the first direction is larger than a thickness of the effective area portion along a third direction crossing the first direction and the second direction.

### Claim 4 (depends on 1)

The display device of claim 1, wherein
an angle formed between the first direction and the plane of the tilted portion is an acute angle.