Glass and display having anti-glare properties
A glass article that is ion-exchangeable and has at least one roughened surface. The roughened surface has a distinctness-of-reflected image DOI of less than 90 when measured at an incidence angle of 20°. A pixelated display system that includes such a glass article is also provided.
1. A glass article having at least one roughened surface, wherein the glass article has a distinctness-of-reflected image of less than 90 and a transmission haze of less than 40%.
2. The glass article of claim 1 , wherein the at least one roughened surface comprises a plurality of topographical features, the plurality of topographical features having an average characteristic largest feature size in a range from 1 μm up to about 50 μm.
3. The glass article of claim 2 , wherein the at least one roughened surface has an average RMS roughness that is less than 10% of the average characteristic largest feature size and greater than 10 nm.
4. The glass article of claim 1 , wherein the at least one roughened surface has an average RMS roughness in a range from about 10 nm up to about 800 nm.
5. The glass article of claim 1 , wherein the glass article is a glass panel that forms a portion of one of a display system and a touch-sensitive input device.
6. The glass article of claim 5 , wherein the display system comprises a pixelated image display panel adjacent to the glass article article, the image-displaying panel having a minimum native pixel pitch dimension that is greater than the average characteristic largest feature size.
7. The glass article of claim 1 , wherein the at least one roughened surface has a reflectance ratio R os /R s , where R os is relative reflectance averaged within a range from 0.2° to 0.4° away from the specular direction and R s is relative reflectance averaged within a range of ±0.05° centered in the specular direction, and wherein R os /R s is greater than 0.1.
8. The glass article of claim 1 , wherein the glass article comprises less than 4 mol % CaO.
9. The glass article of claim 1 , wherein the glass article comprises less than 5 mol % Na 2 O.
10. The glass article of claim 1 , wherein the glass article comprises at least 2 mol % B 2 O 3 .
11. The glass article of claim 1 , wherein the glass article comprises an alkali aluminosilicate glass comprising at least 2 mol % Al 2 O 3 .
12. The glass article of claim 11 , wherein the alkali aluminosilicate glass is ion exchanged to form a compressive stress layer on at least one surface of the glass article.
13. The glass article of claim 12 , wherein the ion exchanged glass has a compressive stress of at least 350 MPa and a compressive depth of layer of at least 15 microns.
14. The glass article of claim 12 , wherein the ion exchanged glass has a central tension of at least 10 MPa.
15. The glass article of claim 11 , wherein the alkali aluminosilicate glass comprises: 60-70 mol % SiO 2 ; 6-14 mol % Al 2 O 3 ; 0-15 mol % B 2 O 3 ; 0-15 mol % Li 2 O; 0-20 mol % Na 2 O; 0-10 mol % K 2 O; 0-8 mol % MgO; 0-10 mol % CaO; 0-5 mol % ZrO 2 ; 0-1 mol % SnO 2 ; 0-1 mol % CeO 2 ; less than 50 ppm As 2 O 3 ; and less than 50 ppm Sb 2 O 3 ; wherein 12 mol %≦Li 2 O+Na 2 O+K 2 O≦20 mol % and 0 mol %≦MgO+CaO≦10 mol %.
16. The glass article of claim 11 , wherein the alkali aluminosilicate glass comprises at least 58 mol % SiO 2 and at least one alkali metal modifier, wherein the ratio, expressed in mol %, (Al 2 O 3 (mol %)+B 2 O 3 (mol %))/Σ(modifiers (mol %))>1, and wherein the modifiers are selected from the group consisting of alkali metal oxides and alkaline earth metal oxides.
17. The glass article of claim 16 , wherein the alkali aluminosilicate glass comprises: 60-72 mol % SiO 2 ; 9-16 mol % Al 2 O 3 ; 5-12 mol % B 2 O 3 ; 8-16 mol % Na 2 O; and 0-4 mol % K 2 O.
18. The glass article of claim 11 , wherein the alkali aluminosilicate glass comprises: 61-75 mol % SiO 2 ; 7-15 mol % Al 2 O 3 ; 0-12 mol % B 2 O 3 ; 9-21 mol % Na 2 O; 0-4 mol % K 2 O; 0-7 mol % MgO; and 0-3 mol % CaO.
19. A display system, the display system comprising:
a. a glass panel, wherein the glass panel has at least one roughened surface, the roughened surface having a distinctness-of-reflected image DOI of less than 90 and a transmission haze of less than 40% and comprising a plurality of topographical features, the plurality of topographical features having an average characteristic largest feature size; and
b. a pixelated image-displaying panel adjacent to the glass panel, the image-displaying panel having a minimum native pixel pitch dimension, wherein the average characteristic largest feature size is less than the minimum native pixel pitch dimension.
20. The display system of claim 19 , wherein the at least one roughened surface has an average RMS roughness in a range from about 10 nm up to about 800 nm.
21. The display system of claim 19 , wherein the at least one roughened surface has an average RMS roughness that is less than 10% of the average characteristic largest feature size and greater than 10 nm.
22. The display system of claim 19 , wherein the at least one roughened surface has a reflectance ratio R os /R s , where R os is relative reflectance averaged within a range from 0.2° to 0.4° away from the specular direction and R s is relative reflectance averaged within a range of ±0.05° centered in the specular direction, and wherein R os /R s is greater than 0.1.
23. The display system of claim 19 , wherein the glass panel is an alkali aluminosilicate glass panel comprising at least 2 mol % Al 2 O 3 .
24. The display system of claim 23 , wherein the alkali aluminosilicate glass panel is ion exchanged to form a compressive stress layer on at least one surface of the glass panel.
25. The display system of claim 24 , wherein the ion exchanged glass panel has a compressive stress of at least 350 MPa and a compressive depth of layer of at least 15 microns.
26. The display system of claim 24 , wherein the ion exchanged glass panel has a central tension of at least 10 MPa.
27. An aluminosilicate glass article, wherein the glass article comprises at least 2 mol % Al 2 O 3 and is ion-exchangeable, and wherein the aluminosilicate glass has at least one roughened surface, the glass article having a distinctness-of-reflected image DOI of less than 90 and a transmission haze of less than 40%.
28. The aluminosilicate glass article of claim 27 , wherein the at least one roughened surface comprises a plurality of topographical features, the plurality of topographical features having an average characteristic largest feature size in a range from 1 μm up to about 50 μm.
29. The glass article of claim 27 , wherein the at least one roughened surface has an average RMS roughness in a range from about 10 nm up to about 800 nm.
30. The glass article of claim 27 , wherein the at least one roughened surface has an average RMS roughness that is less than 10% of the average characteristic largest feature size and greater than 10 nm.
31. The glass article of claim 27 , wherein the glass article is a glass panel that forms a portion of one of a display system and a touch-sensitive input device.
32. The glass article of claim 30 , wherein the display system comprises a pixelated image display panel adjacent to the glass panel, the image-displaying panel having a minimum native pixel pitch dimension that is greater than the average characteristic largest feature size.
33. The glass article of claim 27 , wherein the at least one roughened surface has a reflectance ratio R os /R s , where R os is relative reflectance averaged within a range of ±0.4° off the specular direction and R s is relative reflectance averaged within a range of ±0.05° centered in the specular direction, and wherein R os /R s is greater than 0.1.
34. The glass article of claim 27 , wherein the alkali aluminosilicate glass is ion exchanged to form a compressive stress layer on at least one surface of the glass article.
35. The glass article of claim 34 , wherein the ion exchanged glass has a compressive stress of at least 350 MPa and a compressive depth of layer of at least 15 microns.
36. The glass article of claim 33 , wherein the ion exchanged glass has a central tension of at least 10 MPa.
37. The glass article of claim 27 , wherein the alkali aluminosilicate glass comprises: 60-70 mol % SiO 2 ; 6-14 mol % Al 2 O 3 ; 0-15 mol % B 2 O 3 ; 0-15 mol % Li 2 O; 0-20 mol % Na 2 O; 0-10 mol % K 2 O; 0-8 mol % MgO; 0-10 mol % CaO; 0-5 mol % ZrO 2 ; 0-1 mol % SnO 2 ; 0-1 mol % CeO 2 ; less than 50 ppm As 2 O 3 ; and less than 50 ppm Sb 2 O 3 ; wherein 12 mol %≦Li 2 O+Na 2 O+K 2 O≦20 mol % and 0 mol %≦MgO+CaO≦10 mol %.
38. The glass article of claim 27 , wherein the alkali aluminosilicate glass comprises at least 58 mol % SiO 2 and at least one alkali metal modifier, wherein the ratio, expressed in mol %, (Al 2 O 3 (mol %)+B 2 O 3 (mol %))/Σ(modifiers (mol %))>1, and wherein the modifiers are selected from the group consisting of alkali metal oxides and alkaline earth metal oxides.
39. The glass article of claim 38 , wherein the alkali aluminosilicate glass comprises: 60-72 mol % SiO 2 ; 9-16 mol % Al 2 O 3 ; 5-12 mol % B 2 O 3 ; 8-16 mol % Na 2 O; and 0-4 mol % K 2 O. wherein the alkali aluminosilicate glass comprises: 60-72 mol % SiO 2 ; 9-16 mol % Al 2 O 3 ; 5-12 mol % B 2 O 3 ; 8-16 mol % Na 2 O; and 0-4 mol % K 2 O.
40. The glass article of claim 27 , wherein the alkali aluminosilicate glass comprises: 61-75 mol % SiO 2 ; 7-15 mol % Al 2 O 3 ; 0-12 mol % B 2 O 3 ; 9-21 mol % Na 2 O; 0-4 mol % K 2 O; 0-7 mol % MgO; and 0-3 mol % CaO.