# US 11,112,640 B2 · Optical member

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- Number: US 11,112,640 B2
- Document ID: US11112640B2
- Status: Granted
- Kind: B2
- Application number: 16/764,738
- Filed: 2018-10-16
- Published: 2021-06-17
- Granted: 2021-09-07
- Earliest claimed: 2017-11-16
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Kozo Nakamura
- Web page: https://patentgrep.com/patent/US11112640B2

## CPC

- G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide}
- G02F 1/133504: {Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606)}
- G02B 5/0221: {the surface having an irregular structure (G02B5/0226 takes precedence)}
- G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)}
- G02B 5/0278: {used in transmission}
- G02F 1/133507: {Films for enhancing the luminance}
- G02F 1/133531: {characterised by the arrangement of polariser or analyser axes}
- G02F 1/133536: {Reflective polarizers (G02F1/13362 takes precedence)}
- G02F 2202/28: Adhesive materials or arrangements
- G02F 2202/36: Micro- or nanomaterials
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

## Abstract

There is provided an optical member capable of achieving a liquid crystal display apparatus that is thin and has extremely high brightness. An optical member of the present invention includes: a first member having a function of converting direction of light; and a second member laminated on the first member via an adhesion layer. The adhesion layer has void portions, and non-contact portions are defined at an interface between the adhesion layer and the first member and/or the second member, and the adhesion layer is brought into contact with each of the first member and the second member in four corner portions of the optical member in plan view.

## Claims

### Claim 1

An optical member, comprising:
a first member having a function of converting direction of light; and
a second member laminated on the first member via an adhesion layer,
wherein the adhesion layer has void portions, and non-contact portions are defined at an interface between the adhesion layer and at least one of the first member and the second member, and
wherein the adhesion layer is brought into contact with each of the first member and the second member in four corner portions of the optical member in plan view.

### Claim 2 (depends on 1)

The optical member according to claim 1, wherein the adhesion layer is brought into contact with each of the first member and the second member over an entire peripheral edge portion of the optical member in plan view.

### Claim 3 (depends on 1)

The optical member according to claim 1, wherein the void portions of the adhesion layer are each defined by a depressed portion of a surface uneven structure of the adhesion layer.

### Claim 4 (depends on 1)

The optical member according to claim 1, wherein the void portions of the adhesion layer include a through-hole that penetrates through the adhesion layer in a thickness direction thereof.

### Claim 5 (depends on 1)

The optical member according to claim 1, wherein a void ratio of the adhesion layer in plan view is from 70% to 90%.

### Claim 6 (depends on 1)

The optical member according to claim 1, further comprising a diffuser on an opposite side of the second member to the first member.

### Claim 7 (depends on 6)

The optical member according to claim 6, wherein the diffuser is arranged so as to be spaced apart from the second member.

### Claim 8 (depends on 1)

The optical member according to claim 1, wherein the second member is a laminate of two optical films laminated via another adhesion layer, and the another adhesion layer has light diffusibility.

### Claim 9

An optical member, comprising:
a prism sheet; and
a second member laminated on the prism sheet via an adhesion layer, the second member being a laminate of a polarizing plate and a reflective polarizer,
wherein the adhesion layer has void portions, and non-contact portions are defined at an interface between the adhesion layer and at least one of the prism sheet and the second member,
wherein the adhesion layer is brought into contact with each of the prism sheet and the second member in four corner portions of the optical member in plan view,
wherein the void portions of the adhesion layer include a through-hole that penetrates through the adhesion layer in a thickness direction thereof, and
wherein a void ratio of the adhesion layer in plan view is from 70% to 90%.

### Claim 10 (depends on 9)

The optical member according to claim 9, further comprising a diffuser on an opposite side of the second member to the prism sheet.

### Claim 11 (depends on 10)

The optical member according to claim 10, wherein the diffuser is arranged so as to be spaced apart from the second member.