# US 12,216,354 B2 · Display device

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- Number: US 12,216,354 B2
- Document ID: US12216354B2
- Status: Granted
- Kind: B2
- Application number: 18/522,468
- Filed: 2023-11-29
- Published: 2024-05-30
- Granted: 2025-02-04
- Earliest claimed: 2022-11-29
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Tenfu Nakamura
- Web page: https://patentgrep.com/patent/US12216354B2

## CPC

- G02F 1/1336: {Illuminating devices}
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area}
- G02B 6/0088: {of the light guide or other optical sheets in the package}
- G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- G02F 1/13775: {Polymer-stabilized liquid crystal layers}
- G02F 2202/28: Adhesive materials or arrangements
- 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, a display device includes a display panel displaying an image, a light guide overlapping with the display panel and including a first side surface, and a light source emitting light to the first side surface. The light guide includes a first transparent substrate, a second transparent substrate provided between the display panel and the first transparent substrate, and a first adhesive layer bonding the first transparent substrate to the second transparent substrate. A thickness of the second transparent substrate is different from a thickness of the first transparent substrate.

## Claims

### Claim 1

A display device comprising:
a display panel displaying an image;
a light guide overlapping with the display panel and including a first side surface; and
a light source emitting light to the first side surface, wherein
the light guide includes a first transparent substrate, a second transparent substrate provided between the display panel and the first transparent substrate, and a first adhesive layer bonding the first transparent substrate to the second transparent substrate,
a thickness of the second transparent substrate is different from a thickness of the first transparent substrate,
the second transparent substrate includes a first main surface opposed to the display panel, a second side surface connected to the first main surface, and a third side surface on a side opposite to the second side surface,
the light guide further comprises a low-refractive layer formed on the first main surface and having a refractive index lower than a refractive index of the second transparent substrate,
the second side surface is included in the first side surface,
the low-refractive layer extends in a first direction from the second side surface toward the third side surface and includes a plurality of band portions spaced apart in a second direction orthogonal to the first direction, and
a length of the band portion in the second side surface side along the second direction is greater than a length of the band portion in the third side surface side along the second direction.

### Claim 2 (depends on 1)

The display device of claim 1, wherein
the low-refractive layer extends in the second direction and further includes a base to which portions of the plurality of band portions on the third side surface side are connected.