# US 12,601,942 B2 · Anti-reflective film-attached transparent substrate and image display device

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- Number: US 12,601,942 B2
- Document ID: US12601942B2
- Status: Granted
- Kind: B2
- Application number: 18/155,997
- Filed: 2023-01-18
- Published: 2023-07-20
- Granted: 2026-04-14
- Earliest claimed: 2022-01-19
- Assignees: AGC Inc.
- Applicants: AGC Inc.
- Inventors: Kazuya Takemoto; Keisuke Kawai; Teruo Fujiwara; Hideaki Takahoshi
- Web page: https://patentgrep.com/patent/US12601942B2

## CPC

- G02B 1/115: Multilayers
- G02F 1/133502: {Antiglare, refractive index matching layers}
- C08J 5/18: Manufacture of films or sheets
- G02B 1/111: using layers comprising organic materials
- G02B 5/0205: {characterised by the diffusing properties}
- G02B 5/0278: {used in transmission}
- G02F 1/133331: {Cover glasses}
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- G02B 1/18: Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence)
- 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
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

An anti-reflective film-attached transparent substrate includes: a transparent substrate including two major surfaces; and a diffusion layer and an anti-reflective film on one major surface of the transparent substrate, which are provided in this order. (A) A luminous reflectance SCI Y of an outermost surface of the anti-reflective film-attached transparent substrate is 1% or lower. (B) The anti-reflective film has a lamination structure in which at least two dielectric layers having different refractive indices are laminated. (C) A ratio (SCE Y)/(SCI Y) of a diffuse reflectance SCE Y of the outermost surface of the anti-reflective film-attached transparent substrate to the luminous reflectance SCI Y of the outermost surface of the anti-reflective film-attached transparent substrate is 0.15 or higher.

## Claims

### Claim 1

An anti-reflective film-attached transparent substrate, comprising:
a transparent substrate;
a diffusion layer formed on a surface of the transparent substrate; and
an anti-reflective film formed on the diffusion layer and having a lamination structure comprising a plurality of dielectric layers having different refractive indices,
wherein the anti-reflective film-attached transparent substrate has an outermost surface having a luminous reflectance SCI Y of 1% or lower and a ratio of a diffuse reflectance SCE Y to the luminous reflectance SCI Y of 0.15 or higher, and
wherein a laminate of the transparent substrate and the diffusion layer has a haze value of 29% or larger.

### Claim 2 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein a laminate of the transparent substrate and the diffusion layer has a haze value of from 29% to 90%.

### Claim 3 (depends on 2)

The anti-reflective film-attached transparent substrate according to claim 2, wherein the anti-reflective film-attached transparent substrate has a luminous transmittance Y of 20% to 90%.

### Claim 4 (depends on 2)

The anti-reflective film-attached transparent substrate according to claim 2, wherein the anti-reflective film has a sheet resistivity of 104 Ω/square or higher.

### Claim 5 (depends on 2)

The anti-reflective film-attached transparent substrate according to claim 2, wherein the anti-reflective film-attached transparent substrate has a b* value of a transmission color with a D65 light source of 5 or smaller.

### Claim 6 (depends on 2)

The anti-reflective film-attached transparent substrate according to claim 2, wherein at least one layer of the dielectric layers is mainly formed of an oxide of Si,
at least another layer in layers of the laminated structure is mainly formed of a mixed oxide of an oxide comprising at least one element selected from the group A consisting of Mo and W and an oxide comprising at least one element selected from the group B consisting of Si, Nb, Ti, Zr, Ta, Al, Sn, and In, and
a content of the elements of the group B in the mixed oxide is 65 mass % or lower with respect to a total of the elements of the group A in the mixed oxide and the elements of the group B in the mixed oxide.

### Claim 7 (depends on 2)

The anti-reflective film-attached transparent substrate according to claim 2, further comprising:
an antifouling film on the anti-reflective film.

### Claim 8 (depends on 2)

The anti-reflective film-attached transparent substrate according to claim 2, wherein the transparent substrate comprises a glass.

### Claim 9 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the anti-reflective film-attached transparent substrate has a luminous transmittance Y of 20% to 90%.

### Claim 10 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the anti-reflective film has a sheet resistivity of 104 Ω/square or higher.

### Claim 11 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the anti-reflective film-attached transparent substrate has a b* value of a transmission color with a D65 light source of 5 or smaller.

### Claim 12 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein at least one layer of the dielectric layers is mainly formed of an oxide of Si,
at least another layer in layers of the laminated structure is mainly formed of a mixed oxide of an oxide comprising at least one element selected from the group A consisting of Mo and W and an oxide comprising at least one element selected from the group B consisting of Si, Nb, Ti, Zr, Ta, Al, Sn, and In, and
a content of the elements of the group B in the mixed oxide is 65 mass % or lower with respect to a total of the elements of the group A in the mixed oxide and the elements of the group B in the mixed oxide.

### Claim 13 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, further comprising:
an antifouling film on the anti-reflective film.

### Claim 14 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the transparent substrate comprises a glass.

### Claim 15 (depends on 14)

The anti-reflective film-attached transparent substrate according to claim 14, wherein the glass is chemically strengthened.

### Claim 16 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the transparent substrate comprises at least one resin selected from polyethylene terephthalate, polycarbonate, acrylic, silicone, and triacetyl cellulose.

### Claim 17 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the transparent substrate is a laminate of a glass and at least one resin selected from polyethylene terephthalate, polycarbonate, acrylic, silicone, and triacetyl cellulose.

### Claim 18 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein the surface of the transparent substrate on a side where the anti-reflective film is formed is subjected to an antiglare treatment.

### Claim 19 (depends on 1)

An image display device, comprising:
the anti-reflective film-attached transparent substrate of claim 1.

### Claim 20 (depends on 1)

The anti-reflective film-attached transparent substrate according to claim 1, wherein a laminate of the transparent substrate and the diffusion layer has a haze value of 50% or larger.