# US 11,442,215 B2 · Light emitting device including a plurality of first and second protrusions

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- Number: US 11,442,215 B2
- Document ID: US11442215B2
- Status: Granted
- Kind: B2
- Application number: 17/305,345
- Filed: 2021-07-06
- Published: 2022-01-06
- Granted: 2022-09-13
- Earliest claimed: 2020-07-06
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Makoto Hasegawa; Nobuyuki Suzuki; Masafumi Okada
- Web page: https://patentgrep.com/patent/US11442215B2

## CPC

- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide}
- G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0066: {characterised by the light source being coupled to the light guide}
- G02B 6/003: {Lens or lenticular sheet or layer}
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

According to one embodiment, a light emitting device includes a light guide plate, a prism sheet, and a lenticular lens, wherein, a plurality of first protrusions of the light guide plate are arranged along a first direction and extend along a second direction intersecting the first direction, a plurality of second protrusions of the light guide plate extend along the first direction and are arranged along the second direction, the prism sheet includes a plurality of third protrusions extending along the first direction and arranged in the second direction, and the lenticular lens includes a plurality of fourth protrusions arranged along the first direction and extending along the second direction.

## Claims

### Claim 1

A light emitting device comprising:
a light guide plate including a plurality of first protrusions on a first main surface and a plurality of second protrusions on a second main surface opposite to the first main surface;
a plurality of light source elements disposed adjacent to the light guide plate;
a prism sheet having a third main surface opposed to the first main surface and a fourth main surface opposite to the third main surface; and
a lenticular lens including a fifth main surface opposed to a fourth main surface of the prism sheet and a sixth main surface opposite to the fifth surface, wherein
the first protrusions of the light guide plate are arranged along a first direction and extend along a second direction intersecting the first direction,
the light source elements emit light to the second direction,
the second protrusions of the light guide plate extend along the first direction and are arranged along the second direction,
the prism sheet includes, on the third main surface, a plurality of third protrusions extending along the first direction and arranged in the second direction, and
the lenticular lens includes, on the sixth main surface, a plurality of fourth protrusions arranged along the first direction and extending along the second direction.

### Claim 2 (depends on 1)

The light emitting device according to claim 1, wherein a cross-sectional shape of each of the third protrusions of the prism sheet along the second direction is an isosceles triangle whose vertex angle is located below a base.

### Claim 3 (depends on 1)

The light emitting device according to claim 1, further comprising a reflection sheet disposed to face the second main surface of the light guide plate.

### Claim 4 (depends on 1)

The light emitting device according to claim 1,
wherein side surfaces of the light guide plate include a first side surface and a second side surface, and
wherein the light source elements include a plurality of first light source elements disposed adjacent to the first side surface of the light guide plate, and a plurality of second light source elements disposed adjacent to the second side surface of the light guide plate.

### Claim 5

A light emitting device comprising:
a light guide plate including a plurality of first protrusions on a first main surface and a plurality of second protrusions on a second main surface opposite to the first main surface;
a plurality of light source elements disposed adjacent to the light guide plate;
a prism sheet having a third main surface opposed to the first main surface and a fourth main surface opposite to the third main surface; and
a lenticular lens including a fifth main surface opposed to a fourth main surface of the prism sheet and a sixth main surface opposite to the fifth main surface, wherein
the first protrusions of the light guide plate are arranged along a first direction and extend along a second direction intersecting the first direction,
the light source elements emit light to the second direction,
the second protrusions of the light guide plate extend along the first direction and are arranged along the second direction,
the prism sheet includes a plurality of third protrusions extending along the first direction and arranged in the second direction,
the lenticular lens includes a plurality of fourth protrusions arranged along the first direction and extending along the second direction,
a light emitting surface of each of the light source elements is disposed in the second direction, and
a cross-sectional shape of each of the fourth protrusions includes an arc having a curvature of 35.21±15%.

### Claim 6 (depends on 5)

The light emitting device according to claim 5, wherein a cross-sectional shape of each of the third protrusions of the prism sheet along the second direction is an isosceles triangle whose vertex angle is located below a base.

### Claim 7 (depends on 5)

The light emitting device according to claim 5, further comprising a reflection sheet disposed to face the second main surface of the light guide plate.

### Claim 8 (depends on 5)

The light emitting device according to claim 5,
wherein side surfaces of the light guide plate include a first side surface and a second side surface, and
wherein the light source elements include a plurality of first light source elements disposed adjacent to the first side surface of the light guide plate, and a plurality of second light source elements disposed adjacent to the second side surface of the light guide plate.