Chemically strengthened glass for display device

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 .