# US 12,600,666 B2 · Glass article having an anti-reflective coating

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- Number: US 12,600,666 B2
- Document ID: US12600666B2
- Status: Granted
- Kind: B2
- Application number: 17/436,709
- Filed: 2020-03-13
- Published: 2022-05-19
- Granted: 2026-04-14
- Earliest claimed: 2019-03-14
- Assignees: Pilkington Group Limited
- Applicants: Pilkington Group Limited
- Inventors: Jun Ni; Srikanth Varanasi
- Web page: https://patentgrep.com/patent/US12600666B2

## CPC

- C03C 17/3417: {all coatings being oxide coatings}
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 2217/734: comprising an alternation of high and low refractive indexes
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A glass article includes a glass substrate with a coating formed over the glass substrate. The coating includes a first anti-reflective layer deposited over the glass substrate, the first layer having a refractive index of 1.6 or more and a thickness of less than λ/(4*n). A second anti-reflective layer is deposited over the first anti-reflective layer, the second anti-reflective layer having a thickness that is greater than the thickness of the first anti-reflective layer and a refractive index that is less than the refractive index of the first anti-reflective layer. The glass article exhibits a total visible light reflectance of less than 6.0%.

## Claims

### Claim 1

A glass article comprising a glass substrate and a coating formed over the glass substrate, wherein the coating comprises:
a first anti-reflective layer deposited over the glass substrate, wherein the first layer comprises undoped tin oxide and has a thickness of less than λ/(4*n), where λ equals 550 nm, n equals the refractive index of the first anti-reflective layer, and n is 1.6 or more;
a second anti-reflective layer deposited over the first anti-reflective layer, the second anti-reflective layer having a thickness that is greater than the thickness of the first anti-reflective layer and a refractive index that is less than the refractive index of the first anti-reflective layer; and
an iridescence-suppressing interlayer between the glass substrate and the first anti-reflective layer;
wherein the iridescence-suppressing interlayer comprises a first iridescence-suppressing layer having a refractive index of 1.6 or more and a second iridescence-suppressing layer deposited over the first iridescence-suppressing layer, the second iridescence-suppressing layer having a refractive index that is less than the refractive index of the first iridescence-suppressing layer; and
wherein the glass article exhibits a total visible light reflectance of less than 6.0%.

### Claim 2 (depends on 1)

The glass article of claim 1, wherein the glass article exhibits a total visible light reflectance of 5.5% or less and/or wherein the glass article exhibits a neutral reflected color.

### Claim 3 (depends on 1)

The glass article of claim 1, wherein the refractive index of the first anti-reflective layer is 2.0 or more.

### Claim 4 (depends on 1)

The glass article of claim 1, wherein the thickness of the first anti-reflective layer is less than 70 nm and/or wherein the thickness of the first anti-reflective layer is between 20 nm or more and 60 nm or less.

### Claim 5 (depends on 1)

The glass article of claim 1, wherein the first anti-reflective layer comprises tin oxide and has a thickness of between 20 or more and 50 nm or less.

### Claim 6 (depends on 1)

The glass article of claim 1, wherein the second anti-reflective layer has a thickness of 80 nm or more.

### Claim 7 (depends on 1)

The glass article of claim 1, wherein the refractive index of the second anti-reflective layer is 1.6 or less.

### Claim 8 (depends on 1)

The glass article of claim 1, wherein the second anti-reflective layer comprises silicon dioxide and/or wherein the second anti-reflective layer is the outermost layer of the glass article.

### Claim 9 (depends on 1)

The glass article of claim 1, wherein the first iridescence-suppressing layer comprises tin oxide and/or wherein the first iridescence-suppressing layer has a thickness of between 5 nm or more and 25 nm or less.

### Claim 10 (depends on 1)

The glass article of claim 1, wherein the second iridescence-suppressing layer is deposited directly on the first iridescence-suppressing layer and/or wherein the second iridescence-suppressing layer has a thickness of 5 nm or more and 25 nm or less.

### Claim 11 (depends on 1)

The glass article of claim 1, wherein the second iridescence-suppressing layer comprises silicon dioxide and/or wherein the first anti-reflective layer is deposited directly on the second iridescence-suppressing layer.

### Claim 12 (depends on 1)

The glass article of claim 1, wherein the coating consists of the first iridescence-suppressing layer, the iridescence-suppressing second layer, the first anti-reflective layer, and the second anti-reflective layer.

### Claim 13 (depends on 1)

The glass article of claim 1, wherein the glass article exhibits a total visible light reflectance of from 4.0% to 5.5%.

### Claim 14 (depends on 1)

The glass article of claim 1, wherein the refractive index of the first anti-reflective layer is between 2.1 and 2.5.

### Claim 15 (depends on 1)

The glass article of claim 1, wherein the second anti-reflective layer has a thickness of 80 nm or more and 125 nm or less.

### Claim 16 (depends on 1)

The glass article of claim 1, wherein the second anti-reflective layer has a thickness of 80 nm or more and 110 nm or less.

### Claim 17 (depends on 1)

The glass article of claim 1, wherein the refractive index of the second anti-reflective layer is from 1.2 to 1.5.

### Claim 18 (depends on 1)

The glass article of claim 1, wherein the glass article exhibits a sheet resistance of greater than 1.0×105 ohm/sq.

### Claim 19 (depends on 1)

The glass article of claim 1, wherein the thickness of the second anti-reflective layer is in the range of 80 nm to 95 nm.

### Claim 20 (depends on 1)

The glass article of claim 1, wherein the thickness of the second anti-reflective layer is in the range of 80 nm to 90 nm.

### Claim 21 (depends on 1)

A touch screen electronic device comprising the glass article of claim 1.