Chemically strengthened glass for display device

Patent metadata

Field	Value
Publication number	US-9028967-B2
Application number	US-201314030467-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Mar 18, 2011
Publication date	May 12, 2015
Grant date	May 12, 2015

Abstract

The present invention relates to a chemically strengthened glass for a display device, having a visible light transmittance Tva of 50% or more and less than 91% at a thickness of 1 mm using A light source, and an excitation purity Pe of less than 0.5% at a thickness of 1 mm.

First claim

The invention claimed is:

1. A chemically strengthened glass for a display device, having a visible light transmittance Tva of 50% or more and less than 90% at a thickness of 1 mm using A light source, and an excitation purity Pe of less than 0.5% at a thickness of 1 mm.

2. A chemically strengthened glass for a display device, having a visible light transmittance Tva of 50% or more and less than 91% at a thickness of 1 mm using A light source, and an excitation purity Pe of 0.25% or less at a thickness of 1 mm.

3. The chemically strengthened glass for a display device according to claim 1 , which contains, in terms of oxides, 0.03% by mass or more of Fe 2 O 3 , 0.005% by mass or more in total of one or more components selected from the group consisting of TiO 2 , MnO 2 , V 2 O 5 , NiO, CoO, and Cr 2 O 3 .

4. The chemically strengthened glass for a display device according to claim 2 , which contains, in terms of oxides, 0.03% by mass or more of Fe 2 O 3 , 0.005% by mass or more in total of one or more components selected from the group consisting of TiO 2 , MnO 2 , V 2 O 5 , NiO, CoO, and Cr 2 O 3 .

5. A chemically strengthened glass for a display device, having a visible light transmittance Tva of less than 91% at a thickness of 1 mm using A light source, an excitation purity Pe of less than 0.5% at a thickness of 1 mm, and (92-Tva)/Pe of 5.8 or more.

6. The chemically strengthened glass for a display device according to claim 5 , which does not contain CoO, NiO, and Cr 2 O 3 and contains 0.1% by mass or more and 0.6% by mass or less of Fe 2 O 3 in terms of oxides, and wherein Redox is 55% or less.

7. The chemically strengthened glass for a display device according to claim 5 , which contains, in terms of oxides, 0.03% by mass or more of Fe 2 O 3 , 0.0007% by mass or more of CoO, and 0.0025% by mass or more of NiO.

8. The chemically strengthened glass for a display device according to claim 5 , which contains, in terms of oxides, 0.03% by mass or more of Fe 2 O 3 , 0.00050% by mass or more of CoO, and 0.005% by mass or more of Cr 2 O 3 .

9. The chemically strengthened glass for a display device according to claim 1 , wherein the glass contains, as represented by mol % on the basis of oxides, from 50 to 74% of SiO 2 , from 4 to 16% of Al 2 O 3 , from 0 to 10% of B 2 O 3 , from 0 to 16% of Li 2 O, from 4 to 16% of Na 2 O, from 0 and 8% of K 2 O, from 3 to 15% of MgO, from 0 to 10% of CaO, and from 0 to 5% of ZrO 2 , and wherein the sum of contents of SiO 2 and Al 2 O 3 is 82% or less.

10. The chemically strengthened glass for a display device according to claim 2 , wherein the glass contains, as represented by mol % on the basis of oxides, from 50 to 74% of SiO 2 , from 4 to 16% of Al 2 O 3 , from 0 to 10% of B 2 O 3 , from 0 to 16% of Li 2 O, from 4 to 16% of Na 2 O, from 0 and 8% of K 2 O, from 3 to 15% of MgO, from 0 to 10% of CaO, and from 0 to 5% of ZrO 2 , and wherein the sum of contents of SiO 2 and Al 2 O 3 is 82% or less.

11. The chemically strengthened glass for a display device according to claim 5 , wherein the glass contains, as represented by mol % on the basis of oxides, from 50 to 74% of SiO 2 , from 4 to 16% of Al 2 O 3 , from 0 to 10% of B 2 O 3 , from 0 to 16% of Li 2 O, from 4 to 16% of Na 2 O, from 0 and 8% of K 2 O, from 3 to 15% of MgO, from 0 to 10% of CaO, and from 0 to 5% of ZrO 2 , and wherein the sum of contents of SiO 2 and Al 2 O 3 is 82% or less.

12. The chemically strengthened glass for a display device according to claim 1 , wherein the glass does not contain BaO or contains less than 1% of BaO as represented by mol % on the basis of oxides.

13. The chemically strengthened glass for a display device according to claim 1 , which contains less than 0.05% by mass of SnO 2 in terms of oxides.

14. The chemically strengthened glass for a display device according to claim 1 , which is obtained by chemically strengthening a glass sheet produced by a float process, a downdraw process, a fusion process, or a roll-out process.

15. The chemically strengthened glass for a display device according to claim 2 , which is obtained by chemically strengthening a glass sheet produced by a float process, a downdraw process, a fusion process, or a roll-out process.

16. The chemically strengthened glass for a display device according to claim 5 , which is obtained by chemically strengthening a glass sheet produced by a float process, a downdraw process, a fusion process, or a roll-out process.

17. The chemically strengthened glass for a display device according to claim 1 , which is a cover glass.

18. The chemically strengthened glass for a display device according to claim 2 , which is a cover glass.

19. The chemically strengthened glass for a display device according to claim 5 , which is a cover glass.

20. A display device comprising the cover glass according to claim 17 .

Assignees

• Asahi Glass Co Ltd

Inventors

• Koike Akio
• Shimada Yuya
• Saito Isao

Classifications

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• C03C21/002 Primary

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C21/00 Primary

  Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface · CPC title

• Y10T428/315

  Surface modified glass [e.g., tempered, strengthened, etc.] · CPC title

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title