# US 10,502,888 B2 · Lighting device and display device

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

- Number: US 10,502,888 B2
- Document ID: US10502888B2
- Status: Granted
- Kind: B2
- Application number: 15/551,760
- Filed: 2016-02-12
- Published: 2018-01-25
- Granted: 2019-12-10
- Earliest claimed: 2015-02-19
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Hisashi Watanabe; Ryuzo Yuki; Shinya Kadowaki; Mitsuhiro Murata; Takeshi Ishida; Takeshi Masuda
- Web page: https://patentgrep.com/patent/US10502888B2

## CPC

- G02B 6/0083: {Details of electrical connections of light sources to drivers, circuit boards, or the like}
- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- 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: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A lighting device includes a light guide plate (14) having a light exit surface (14A) having a substantially circular shape and a light entrance surface (14C) extending along an entire periphery of an outer edge of the light exit surface (14A), an LED (31A) opposite the light entrance surface (14C), and an LED (32A) that is opposite the light entrance surface (14C) and is connected in parallel to the LED (31A) and the LED (32A) is arranged opposite from the LED (31A) with having a center (C1) of the light exit surface (14A) therebetween.

## Claims

### Claim 1

A lighting device comprising:
a light guide plate having a light exit surface having a substantially circular shape and a light entrance surface extending along an entire periphery of an outer edge of the light exit surface;
a first light source opposite the light entrance surface; and
a second light source opposite the light entrance surface, the second light source that is connected in parallel to the first light source or connected to a power supply different from a power supply that is connected to the first light source, the second light source arranged opposite from the first light source with having a center of the light exit surface therebetween
the first light source includes first light sources that are arranged in a circumferential direction of the light entrance surface,
the first light sources are connected in series,
the second light source includes second light sources that are arranged in the circumferential direction of the light entrance surface, and
the second light sources are connected in series;
the first light sources and the second light sources are at least included in light sources,
a total number of the light sources is an odd number,
the light sources are arranged at equal intervals in an annular shape having a center corresponding to the center of the light exit surface, and
a value obtained by (R1 * circumference of ratio)/N is 10 mm or less, R1 is a distance between each of the light sources and the center of the light exit surface, and N is the total number of the light sources.

### Claim 2 (depends on 1)

The lighting device according to claim 1, wherein the first light sources and the second light sources are arranged alternately in the circumferential direction of the light entrance surface.

### Claim 3 (depends on 1)

The lighting device according to claim 1, wherein
the first light sources are arranged at equal intervals in an annular shape having a center corresponding to the center of the light exit surface and a number of the first light sources is an odd number, and
the second light sources are arranged at equal intervals in an annular shape having a center corresponding to the center of the light exit surface and a number of the second light sources is an odd number.

### Claim 4 (depends on 1)

A display device comprising:
the lighting device according to claim 1; and
a display panel display with using light from the lighting device.