# US 2023/0056516 A1 · Lighting device

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

- Number: US 2023/0056516 A1
- Document ID: US20230056516A1
- Status: Published application
- Kind: A1
- Application number: 17/979,788
- Filed: 2022-11-03
- Published: 2023-02-23
- Earliest claimed: 2021-03-19
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Makoto HASEGAWA; Masafumi OKADA
- Web page: https://patentgrep.com/patent/US20230056516A1

## CPC

- G02B 6/0053: {Prismatic sheet or layer; Brightness enhancement element, sheet or layer}
- G02B 6/0073: {Light emitting diode [LED]}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A lighting device including: a light guide having a first side surface extending in a first direction and a second side surface opposing to the first side surface and extending in the first direction, a first LED being disposed at the first side surface, a second LED being disposed at the second side surface; in which a first area extends in the first direction and a second area extends in the second direction in the light guide; a prism sheet is disposed on the light guide; a prism extending in the first direction and arranged in the second direction is formed on the prism sheet; a first surface of the prism has a first angle with normal direction of the second prism sheet; a second surface of the prism has a second angle with normal direction of the second prism sheet; the first angle is larger than the second angle.

## Claims

### Claim 1

A lighting device comprising:
a light guide having a first side surface extending in a first direction and a second side surface opposing to the first side surface and extending in the first direction,
a first LED being disposed at the first side surface,
a second LED being disposed at the second side surface,
wherein an area in which the first LED is disposed and extends in the second direction is defined as a first area,
an area in which the second LED is disposed and extends in the second direction is defined as a second area,
a prism sheet is disposed on the light guide,
a prism extending in the first direction and arranged in the second direction is formed on the prism sheet,
the prism has a first plane extending along the first direction and a second plane extending along the first direction, and is triangular in cross sectional view along the second direction, and
a first angle between the first plane and the normal line to a base of the triangle is smaller than a second angle between the second plane and the normal line to the base of the triangle.

### Claim 2 (depends on 1)

The lighting device according to claim 1,
wherein a first prism, which extends in the second direction and is arranged in the first direction, is formed on an upper surface of the light guide, and
a second prism, which extends in the first direction and is arranged in the second direction, is formed on a lower surface of the light guide.

### Claim 3 (depends on 2)

The lighting device according to claim 2,
wherein a height and a pitch of the first prism formed on the upper surface of the light guide is smaller than a height and a pitch of the prism formed on the prism sheet, and
a height and a pitch of the second prism formed on the lower surface of the light guide is smaller than a height and a pitch of the prism formed on the prism sheet.

### Claim 4 (depends on 1)

The lighting device according to claim 1,
wherein a surface of the prism sheet on which the prism is formed opposes to the light guide.