Flat panel display

• US 5,508,237 A
• Filed: 08/10/1994
• Issued: 04/16/1996
• Est. Priority Date: 03/14/1994
• Status: Expired

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Neubauer, Dean V., Moffatt, Dawne M.
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US08/288,300
• Time in Patent Office: 615 Days
• Field of Search: 501/66, 501/69, 501/70, 65/90, 65/99.2
• US Class Current: 501/69
• CPC Class Codes: C03C 3/085 containing an oxide of a divalent metal
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: G02F 1/133337 Layers preventing ion diffusion, e.g. by ion absorption

Abstract

A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640° C., a weight loss less than 20 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95° C., a CTE in the range of 31-57×10^-7 /° C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO₂, at least 6% Al₂ O₃, the Al₂ O₃ being 6-14% in conjunction with 55-67% SiO₂ and 16-23% in conjunction with 49-58% SiO₂, SiO₂ +Al₂ O₃ >68%, 0-15% B₂ O₃, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-18% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.

Claims

1. A flat panel display comprising an aluminosilicate glass panel that exhibits a strain point higher than 640°

C., a weight loss less than 2.5 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

C., a CTE in the range of 31-57×

10^-7 /°

C., is nominally free of alkali metal oxides and has a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO₂, at least 6% Al₂ O₃, the Al₂ O₃ being 6-14% in conjunction with 55-67% SiO₂ and 16-23% in conjunction with 49-58% SiO₂, SiO₂ +Al₂ O₃ >

68%, 0 to less than 8% B₂ O₃, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.

2. A flat panel display in accordance with claim 1 in which the glass panel has a CTE in the range of 31-44×

10^-7 /°

C. and the glass is selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;

a. 49-58% SiO₂, 17.5-23% Al₂ O₃, 0 to less than 8% B₂ O₃, 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO and MgO+CaO+SrO+BaO being 13-28%,

b. 57-66% SiO₂, 8-14% Al₂ O₃, 0 to less than 8% B₂ O₃, 0-4.5% MgO, 0-7.1% CaO, 0.5-13% SrO and 2-21% BaO.

3. A flat panel display in accordance with claim 2 in which the glass panel has a CTE in the range of 32-40×

10^-7 /°

C. and the aluminosilicate sub-families consist essentially of;

a. 54-57% SiO₂, 17.5-23% Al₂ O₃, 5 to less than 8% B₂ O₃, 2-2.75% MgO, 1.5-<

7% CaO, 2-6% SrO and 0.5-9.5% BaO,

b. 57-65.5% SiO₂, 8-13% Al₂ O₃, 4 to less than 8% B₂ O₃, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.

4. A flat panel display in accordance with claim 1 in which the glass panel has a CTE in the range of 44-57×

10^-7 /°

C. and the glass is selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;

a. 50-57% SiO₂, 16-22% Al₂ O₃, 0-5.5% B₂ O₃, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO and 1-21% BaO,

b. 55-67% SiO₂, 6-14% Al₂ O₃, 0-7.5% B₂ O₃, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO and MgO+CaO+SrO+BaO being 16.5-28%.

5. A flat panel display in accordance with claim 4 in which the glass panel has a CTE in the range of 45-50×

10^-7 /°

C. and the aluminosilicate sub-families consist essentially of;

a. 50-57% SiO₂, 16-20% Al₂ O₃, 0-5.5% B₂ O₃, 2-2.75% MgO, 1-<

7% CaO, 0.5-15% SrO and 1-21% BaO,

b. 55-67% SiO₂, 6-<

13% Al₂ O₃, 0-7.5% B₂ O₃, 2-6.5% MgO, 0-7.1% CaO, 14.5% SrO and 2-9.5% BaO.

6. A flat panel display in accordance with claim 1 in which the glass panel has a strain point greater than 660°

C. and a weight loss less than 1 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

C., the glass being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis;

a. 54-58% SiO₂, 16-23% Al_{2 3}, 0-6% B₂ O₃, 2-4.5% MgO, 1-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%,

b. 55-67% SiO₂, 6-14% Al₂ O₃, 0-7.1% B₂ O₃, 0-7% MgO, 0-7.1% CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.

7. A flat panel display in accordance with claim 1 in which the glass panel has a density less than 2.5 grams/cc and a composition, as calculated in weight percent on an oxide basis, consisting essentially of 54.8-57% SiO₂, 16.8-21.8% Al₂ O₃, 0 to less than 8% B₂ O₃, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%.

8. A method of producing a glass panel for a flat panel display which comprises melting a batch for an aluminosilicate glass consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO₂, at least 6% Al₂ O₃, the Al₂ O₃ being 6-14% in conjunction with 55-67% SiO₂ and 16-23% in conjunction with 49-58% SiO₂, SiO₂ +Al₂ O₃ >

68%, 0 to less than 8% B₂ O₃, at least one alkaline earth metal oxide selected from the group consisting of, in the indicated proportions, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO, SrO+MgO, and drawing a thin sheet of molten glass from the melt.

9. A method in accordance with claim 8 wherein the glass sheet is drawn by a float process.

10. An aluminosilicate glass exhibiting a strain point higher than 640°

C., a weight loss less than 2.5 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

C., a CTE between 31 and 57×

10^-7 /°

C., nominally free of alkali metal oxides and having a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO₂, at least 6% Al₂ O₃, the Al₂ O₃ being 6-14% in conjunction with 55-67% SiO₂ and 16-23% in conjunction with 49-58% SiO₂, SiO₂ +Al₂ O₃ >

68%, 0 to less than 8% B₂ O₃, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.

11. An aluminosilicate glass in accordance with claim 10 having a CTE in the range of 31-44×

10^-7 /°

C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;

a. 49-58% SiO₂, 17.5-23% Al₂ O₃, 0 to less than 8% B₂ O₃, 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO, the glass containing at least one alkaline earth oxide in the indicated proportion and the total BaO+CaO+SrO+MgO content being 13-28%,

b. 57-66% SiO₂, 8-14% Al₂ O₃, 0 to less than 8% B₂ O₃, 0-4.5% MgO, 0-9% CaO, 0.5-13% SrO, 2-21% BaO.

12. An aluminosilicate glass in accordance with claim 11 in which the glass has a CTE of 32-40×

10^-7 /°

C. and the aluminosilicate sub-families consist essentially of;

a. 54-57% SiO₂, 17.5-23% Al₂ O₃, 5 to less than 8% B₂ O₃, 2-2.75% MgO, 1.5-<

7% CaO, 2-6% SrO and 0.5-9.5% BaO,

b. 57-65.5% SiO₂, 8-13% Al₂ O₃, 4 to less than 8% B₂ O₃, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.

13. An aluminosilicate glass in accordance with claim 10 having a CTE in the range of 44-57×

10^-7 /°

C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;

a. 50-57% SiO₂, 16-22% Al₂ O₃, 0-5.5% B₂ O₃, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, 1-21% BaO,

b. 55-67% SiO₂, 6-14% Al₂ O₃, 0-7.5 % B₂ O₃, 0-6.5% MgO, 0-7.1% CaO, 0-15.5% SrO, 1-9.5% BaO, the total MgO+CaO+SrO+BaO being 16.5-28%.

14. An aluminosilicate glass in accordance with claim 13 in which the glass has a CTE in the range of 45-50×

10^-7 /°

C. and the aluminosilicate sub-families consist essentially of;

a. 50-57% SiO₂, 16-20% Al₂ O₃, 0-5.5% B₂ O₃, 2-2.75% MgO, 1-<

7% CaO, 0.5-15% SrO and 1-21% BaO,

b. 55-67% SiO₂, 6-<

13% Al₂ O₃, 0-7.5% B₂ O₃, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.

15. An aluminosilicate glass in accordance with claim 10 having a strain point greater than 660°

C. and a weight loss less than 1 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis;

a. 54-58% SiO₂, 16-23% Al₂ O₃, 0-6% B₂ O₃, 2-4.5% MgO, 0-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%,

b. 55-67% SiO₂, 6-14% Al₂ O₃, 0-7.5% B₂ O₃, 0-7% MgO, 0-18.5 CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.

16. An aluminosilicate glass in accordance with claim 10 having a density less than 2.5 grams/cc and a composition consisting essentially of 54.8-57% SiO₂, 16.8-21.8% Al₂ O₃, 0 to less than 8% B₂ O₃, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%.

17. An aluminosilicate glass substrate exhibiting a strain point higher than 640°

C., a weight loss less than 2.5 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

C., a CTE between 31 and 57×

10^-7 /°

C., nominally free of alkali metal oxides and having a composition consisting essentially of, as calculated in percent by weight on an oxide basis, 49-67% SiO₂, at least 6% Al₂ O₃, the Al₂ O₃ being 6-14% in conjunction with 55-67% SiO₂ and 16-23% in conjunction with 49- 58% SiO₂, SiO₂ +Al₂ O₃ >

68%, 0 to less than 8% B₂ O₃, at least one alkaline earth metal oxide selected from the group consisting of, in the proportions indicated, 0-21% BaO, 0-15% SrO, 0-7.1% CaO, 0-8% MgO and 12-30% BaO+CaO+SrO+MgO.

18. An aluminosilicate glass substrate in accordance with claim 17 having a CTE in the range of 31-44×

10^-7 /°

C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;

a. 49-58% SiO₂, 17.5-23% Al₂ O₃, 0 to less than 8% B₂ O₃, 0-8% MgO, 0-7.1% CaO, 0.4-13.5% SrO, 0-21% BaO, the glass containing at least one alkaline earth oxide in the indicated proportion and the total BaO+CaO+SrO+MgO content being 13-28%,

b. 57-66% SiO₂, 8-14% Al₂ 0₃, 0 to less than 8% B₂ O₃, 0-4.5% MgO, 0-9% CaO, 0.5-13% SrO, 2-21% BaO.

19. An aluminosilicate glass substrate in accordance with claim 18 in which the glass has a CTE of 32-40×

10^-7 /°

C. and the aluminosilicate sub-families consist essentially of;

a. 54-57% SiO₂, 17.5-23% Al₂ O₃, 5 to less than 8% B₂ O₃, 2-2.75% MgO, 1.5-<

7% CaO, 2-6% SrO and 0.5-9.5% BaO,

b. 57-65.5% SiO₂, 8-13% Al₂ O₃, 4 to less than 8% B₂ O₃, 2-3.5% MgO, 0-6.5% CaO, 0-13% SrO and 2-21% BaO.

20. An aluminosilicate glass substrate in accordance with claim 17 having a CTE in the range of 44-57×

10^-7 /°

C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in weight percent on an oxide basis;

a. 50-57% SiO₂, 16-22% Al₂ O₃, 0-5.5% B₂ O₃, 0.5-3% MgO, 1-7.1% CaO, 0.5-15% SrO, 1-21% BaO,

b. 55-67% SiO₂, 6-14% Al₂ O₃, 0-7.5% B₂ O₃, 0-6.5% MgO, 0-18.5% CaO, 0-15.5% SrO, 1-9.5% BaO, the total MgO+CaO+SrO+BaO being 16.5-28%.

21. An aluminosilicate glass substrate in accordance with claim 20 in which the glass has a CTE in the range of 45-50×

10^-7 /°

C. and the aluminosilicate sub-families consist essentially of;

a. 50-57% SiO₂, 16-20% Al₂ O₃, 0-5.5% B₂ O₃, 2-2.75% MgO, 1-<

7% CaO, 0.5-15% SrO and 1-21% BaO,

b. 55-67% SiO₂, 6-<

13% Al₂ O₃, 0-7.5% B₂ O₃, 2-6.5% MgO, 0-7.1% CaO, 0-14.5% SrO and 2-9.5% BaO.

22. An aluminosilicate glass substrate in accordance with claim 17 having a strain point greater than 660°

C. and a weight loss less than 1 mg/cm² after immersion for 24 hours in an aqueous 5% by weight HCl solution at 95°

C. and being selected from a group of aluminosilicate sub-families consisting of glasses having compositions consisting essentially of, as calculated in percent by weight on an oxide basis;

a. 54-58% SiO₂, 16-23% Al₂ O₃, 0-6% B₂ O₃, 2-4.5% MgO, 0-7.1% CaO, 2.5-15.5% SrO and 0-14.5% BaO, MgO+CaO+SrO+BaO being 15-27%,

b. 55-67% SiO₂, 6-14% Al₂ O₃, 0-7.5% B₂ O₃, 0-7% MgO, 0-18.5 CaO, 0-15% SrO, 1-21% BaO, MgO+CaO+SrO+BaO being 18-28%.

23. An aluminosilicate glass substrate in accordance with claim 17 having a density less than 2.5 grams/cc and a composition consisting essentially of 54.8-57% SiO₂, 16.8-21.8% Al₂ O₃, 0 to less than 8% B₂ O₃, 2.2-2.5% MgO, 1.5-7.1% CaO, 4.5-5.5% SrO, 0.1-14.5% BaO, MgO+CaO+SrO+BaO being 12.5-27%.