# US 2016/0259113 A1 · Illuminating device, display device, and mobile electronic apparatus

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- Number: US 2016/0259113 A1
- Document ID: US20160259113A1
- Status: Published application
- Kind: A1
- Application number: 15/048,079
- Filed: 2016-02-19
- Published: 2016-09-08
- Earliest claimed: 2015-03-06
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hidekazu Kobayashi; Masatoshi Yonekubo
- Web page: https://patentgrep.com/patent/US20160259113A1

## CPC

- G02B 6/0016: {Grooves, prisms, gratings, scattering particles or rough surfaces}
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0058: {varying in density, size, shape or depth along the light guide}
- G02B 6/0073: {Light emitting diode [LED]}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An illuminating device includes a first light-emitting element formed of a light-emitting diode and a light-guide plate having on a side surface thereof a first light-incident portion opposing the first light-emitting element. The light-guide plate in plan view has a shape having a curved surface on the side surface thereof at a distance from the first light incident portion. A plurality of first bevels facing the first light-incident portion at a certain angle exceeding (90°—critical angle) with respect to a virtual line extending from a center of the first light-incident portion are provided in at least part of an area of the curved surface in a circumferential direction.

## Claims

### Claim 1

An illuminating device comprising:
a first light-emitting element; and
a light-guide plate including on a side surface thereof a first light-incident portion opposing the first light-emitting element, and configured to emit illumination light from a surface on one side in a thickness direction, wherein
the light-guide plate in plan view has a shape having a curved surface on the side surface thereof at a distance from the first light-incident portion, and
a plurality of first bevels facing the first light-incident portion at a certain angle exceeding (90°—critical angle) with respect to a virtual line extending from a center of the first light-incident portion are provided in at least part of an area of the curved surface in a circumferential direction in plan view.

### Claim 2 (depends on 1)

The illuminating device according to claim 1, wherein
the plurality of first bevels each form an angle of 90° with respect to the corresponding virtual line.

### Claim 3 (depends on 1)

The illuminating device according to claim 1, wherein
among the plurality of first bevels, end portions of the first bevels adjacent to each other in the circumferential direction are connected via a linear portion parallel to the virtual line in plan view.

### Claim 4 (depends on 1)

The illuminating device according to claim 1, wherein
the plurality of first bevels have the same length in plan view.

### Claim 5 (depends on 1)

The illuminating device according to claim 1, further comprising:
a second light-emitting element; wherein
the light-guide plate includes a second light-incident portion opposing the second light-emitting element at a distance from the first light-incident portion on the side surface thereof, and
a plurality of second bevels facing the second light-incident portion at a certain angle exceeding (90°—critical angle) with respect to a virtual line extending from a center of the second light-incident portion are provided in at least part of an area of the curved surface in a circumferential direction in plan view.

### Claim 6 (depends on 1)

The illuminating device according to claim 1, wherein
the light-emitting element is a light-emitting diode.

### Claim 7 (depends on 1)

A display device comprising:
the illuminating device according to claim 1 and
a display panel opposing the surface on one side of the light-guide plate.

### Claim 8 (depends on 2)

A display device comprising:
the illuminating device according to claim 2 and
a display panel opposing the one surface of the light-guide plate.

### Claim 9 (depends on 3)

A display device comprising:
the illuminating device according to claim 3 and
a display panel opposing the one surface of the light-guide plate.

### Claim 10 (depends on 4)

A display device comprising:
the illuminating device according to claim 4 and
a display panel opposing the one surface of the light-guide plate.

### Claim 11 (depends on 5)

A display device comprising:
the illuminating device according to claim 5 and
a display panel opposing the one surface of the light-guide plate.

### Claim 12 (depends on 6)

A display device comprising:
the illuminating device according to claim 6 and
a display panel opposing the one surface of the light-guide plate.

### Claim 13 (depends on 7)

The display device according to claim 7, wherein
the display panel is a reflective display panel.

### Claim 14 (depends on 7)

A mobile electronic apparatus comprising:
the display device according to claim 7.

### Claim 15 (depends on 13)

A mobile electronic apparatus comprising:
the display device according to claim 13.