Anti-reflective coated glass article

Patent metadata

Field	Value
Publication number	US-10042089-B2
Application number	US-201715407093-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	Oct 31, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A coated glass article includes a glass substrate and a pyrolytic coating deposited over the glass substrate. The coating includes a first inorganic metal oxide layer deposited over a major surface of the glass substrate. The first inorganic metal oxide layer includes titanium dioxide or tin oxide, has a refractive index of 1.8 or more, and is deposited at a thickness of 40 nm or less. A second inorganic metal oxide layer is deposited directly on the first inorganic metal oxide layer. The second inorganic metal oxide layer includes silicon dioxide and has a refractive index of 1.6 or less. A third inorganic metal oxide layer is deposited directly on the major surface of the glass substrate. The third inorganic metal oxide layer comprises silicon dioxide. The first inorganic metal oxide layer is deposited directly on the third inorganic metal oxide layer. The coated glass article exhibits a total visible light reflectance of 6.5% or less.

First claim

The invention claimed is:

1. A coated glass article comprising:
a glass substrate; and
a pyrolytic coating deposited over the glass substrate, wherein the coating comprises:
i. a first inorganic metal oxide layer deposited over a major surface of the glass substrate, wherein the first inorganic metal oxide layer is a titanium dioxide layer, has a refractive index of 2.2 or more, and is deposited at a thickness of 40 nm or less,
ii. a second inorganic metal oxide layer deposited directly on the first inorganic metal oxide layer, wherein the second inorganic metal oxide layer comprises silicon dioxide, has a refractive index of 1.6 or less, and is deposited at a thickness of 100 nm or more,
iii. a third inorganic metal oxide layer deposited directly on the major surface of the glass substrate, wherein the first inorganic metal oxide layer is deposited directly on the third inorganic metal oxide layer such that there are no intervening layers between the first inorganic metal oxide layer and the third inorganic metal oxide layer, wherein the third inorganic metal oxide layer is a silicon dioxide layer,
wherein the coated glass article exhibits a total visible light reflectance of 6.5% or less.

2. The coated glass article of claim 1 , wherein the first inorganic metal oxide layer and the second inorganic metal oxide layer are selected so that the coated glass article exhibits a sheet resistance of greater than 1.0×10 5 ohm/sq.

3. The coated glass article of claim 2 , wherein the coated glass article exhibits a sheet resistance of 1.0×10 7 ohm/sq. or more.

4. The coated glass article of claim 1 , wherein the coated glass article exhibits a total visible light transmittance of 94% (Illuminant C) or more.

5. The coated glass article of claim 1 , wherein the first inorganic metal oxide layer is deposited at a thickness of 5-20 nm.

6. The coated glass article of claim 5 , wherein the first inorganic metal oxide layer is deposited at a thickness of 5-15 nm.

7. The coated glass article of claim 1 , wherein the total visible light reflectance exhibited by the coated glass article is 6.0% or less.

8. The coated glass article of claim 1 , wherein the third inorganic metal oxide layer is deposited at a thickness of 25 nm or less.

9. The coated glass article of claim 1 , wherein the second inorganic metal oxide layer is deposited at a thickness of 100-125 nm.

10. A laminated glass unit, the laminated glass unit comprising a coated glass article according to claim 1 .

11. A touch screen electronic device, the touch screen electronic device comprising a coated glass article according to claim 1 .

12. The coated glass article of claim 1 , wherein the third inorganic metal oxide layer has a refractive index of 1.46.

13. The coated glass article of claim 1 , wherein the first inorganic metal oxide layer and the third inorganic metal oxide layer are each discrete.

14. A coated glass article comprising:
a glass substrate; and
a pyrolytic coating deposited over the glass substrate, wherein the coating comprises:
i. a titanium dioxide layer deposited over a major surface of the glass substrate, wherein the titanium dioxide layer has a refractive index of 2.2 or more and is deposited at a thickness of 40 nm or less,
ii. an inorganic metal oxide layer deposited directly on the titanium dioxide layer, wherein the inorganic metal oxide layer has a refractive index of 1.6 or less and is deposited at a thickness of 100 nm or more,
iii. a silicon dioxide layer deposited directly on the major surface of the glass substrate, wherein the titanium dioxide layer is deposited directly on the silicon dioxide layer such that there are no intervening layers between the titanium dioxide layer and the silicon dioxide layer, the silicon dioxide layer having a refractive index of 1.6 or less,
wherein the coated glass article exhibits a total visible light reflectance of 6.0% or less, a total visible light transmittance of 94% (Illuminant C) or more, and a sheet resistance of 1.0×10 7 ohm/sq. or more.

15. The coated glass article of claim 14 , wherein the inorganic metal oxide layer comprises silicon dioxide.

16. A coated glass article comprising:
a glass substrate; and
a pyrolytic coating deposited over the glass substrate, wherein the coating consists of a first inorganic metal oxide layer, a second inorganic metal oxide layer, and a third inorganic metal oxide layer:
i. the first inorganic metal oxide layer deposited over a major surface of the glass substrate, wherein the first inorganic metal oxide layer is a titanium dioxide layer, has a refractive index of 2.2 or more, and is deposited at a thickness of 40 nm or less,
ii. the second inorganic metal oxide layer deposited directly on the first inorganic metal oxide layer and forming an outermost surface of the coated glass article, wherein the second inorganic metal oxide layer comprises silicon dioxide and has a refractive index of 1.6 or less,
iii. the third inorganic metal oxide layer deposited directly on the major surface of the glass substrate, wherein the first inorganic metal oxide layer is deposited directly on the third inorganic metal oxide layer such that there are no intervening layers between the first inorganic metal oxide layer and the third inorganic metal oxide layer, wherein the third inorganic metal oxide layer is a silicon dioxide layer,
wherein the coated glass article exhibits a total visible light reflectance of 6.5% or less.

Assignees

• Pilkington Group Ltd

Inventors

• Varanasi Srikanth

Classifications

• C09D5/006

  Anti-reflective coatings · CPC title

• C03C17/3417 Primary

  all coatings being oxide coatings · CPC title

• G02B1/116 Primary

  including electrically conducting layers · CPC title

• C03C2217/734

  comprising an alternation of high and low refractive indexes · CPC title

• C03C2218/1525

  by atmospheric CVD · CPC title