# US 2023/0057744 A1 · Illumination device

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- Number: US 2023/0057744 A1
- Document ID: US20230057744A1
- Status: Published application
- Kind: A1
- Application number: 17/888,544
- Filed: 2022-08-16
- Published: 2023-02-23
- Earliest claimed: 2021-08-19
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Yosuke NAKAMORI
- Web page: https://patentgrep.com/patent/US20230057744A1

## CPC

- G02F 1/133603: {with LEDs}
- G02B 6/0078: {Side-by-side arrangements, e.g. for large area displays}
- G02F 1/133601: {for spatial active dimming}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133608: {including particular frames or supporting means}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

According to one embodiment, an illumination device includes a first light emitting element, a second light emitting element, an overcoat layer covering the first and second light emitting elements, a first transparent block disposed on the overcoat layer and overlapping the first light emitting element, a second transparent block disposed on the overcoat layer and overlapping the second light emitting element, and an optical sheet group disposed on the first transparent block and the second transparent block. A first side surface of the first transparent block and a second side surface of the second transparent block face each other. An air layer is interposed between the first side surface and the second side surface.

## Claims

### Claim 1

An illumination device comprising:
a circuit board;
light emitting elements including a first light emitting element and a second light emitting element mounted on the circuit board;
an overcoat layer being transparent and covering the circuit board and the light emitting elements;
a first transparent block disposed on the overcoat layer and overlapping the first light emitting element;
a second transparent block disposed on the overcoat layer, adjacent to the first transparent block, and overlapping the second light emitting element; and
an optical sheet group disposed on the first transparent block and the second transparent block,
wherein a first side surface of the first transparent block and a second side surface of the second transparent block face each other, and
an air layer is interposed between the first side surface and the second side surface.

### Claim 2 (depends on 1)

The illumination device of claim 1, wherein
each of the first transparent block and the second transparent block is formed into a square shape and has sides of equal length in planar view.

### Claim 3 (depends on 1)

The illumination device of claim 1, wherein
each of the first transparent block and the second transparent block is made of resin.

### Claim 4 (depends on 1)

The illumination device of claim 1, wherein
the first side surface and the second side surface are planes substantially parallel to each other.

### Claim 5 (depends on 4)

The illumination device of claim 4, wherein
a gap between the first side surface and the second side surface is 100 μm or less.

### Claim 6 (depends on 1)

The illumination device of claim 1, wherein
luminance of the first light emitting element and luminance of the second light emitting element are configured to control independently in different driven units.

### Claim 7 (depends on 1)

The illumination device of claim 1, wherein
luminance of the first light emitting element and luminance of the second light emitting element are configured to control in the same driven unit.

### Claim 8 (depends on 1)

The illumination device of claim 1, further comprising
a transparent film located between the first and second transparent blocks and the optical sheet group and attached to the first and second transparent blocks.

### Claim 9 (depends on 1)

The illumination device of claim 1, wherein
each of the light emitting elements is a blue light emitting diode, and
the optical sheet group includes a wavelength conversion sheet.

### Claim 10 (depends on 9)

The illumination device of claim 9, wherein
the optical sheet group further includes a diffusion sheet, a prism sheet, and a polarizing sheet.