Method for fabricating thin sheets of glass

• US 9,615,448 B2
• Filed: 03/14/2014
• Issued: 04/04/2017
• Est. Priority Date: 06/27/2008
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Feinstein, Casey J., Zhong, John Z., Hotelling, Steve Porter, Chang, Shih Chang
• Primary Examiner(s): Ahmed, Shamim
• Application Number:
  US14/211,396
• Publication Number:
  US 20140196933A1
• Time in Patent Office: 1,117 Days
• Field of Search: 216 23, 216 83, 216 88, 216 89, 451 41
• CPC Class Codes: B24B 7/241 Methods
• CPC Class Codes: B24B 7/242 for plate glass
• CPC Class Codes: C03C 15/00 Surface treatment of glass, not in the form of fibres or filaments, by etching etching or surface-brightening compositions, in general C09K13/00
• CPC Class Codes: C03C 19/00 Surface treatment of glass, not in the form of fibres or filaments, by mechanical means sand-blasting, grinding, or polishing glass B24
• CPC Class Codes: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: Y10T 428/24926 including ceramic, glass, porcelain or quartz layer
• CPC Class Codes: Y10T 428/266 of base or substrate

Abstract

Fabrication of thin sheets of glass or other substrate material for use in devices such as touch sensor panels is disclosed. A pair of thick glass sheets, typically with thicknesses of 0.5 mm or greater each, may each be patterned with thin film on a surface, sealed together to form a sandwich with the patterned surfaces facing each other and spaced apart by removable spacers, either or both thinned on their outside surfaces to thicknesses of less than 0.5 mm each, and separated into two thin glass sheets. A single thick glass sheet, typically with a thickness of 0.5 mm or greater, may be patterned, covered with a protective layer over the pattern, thinned on its outside surface to a thickness of less than 0.5 mm, and the protective layer removed. This thinness of less than 0.5 mm may be accomplished using standard LCD equipment, despite the equipment having a sheet minimum thickness requirement of 0.5 mm.

Claims

1. A method for fabricating a thin sheet of glass comprising:

providing a sheet of glass having a first thickness of at least 0.5 mm;

applying a patterned thin film on a first major surface of the sheet of glass;

applying a protective layer of material having a second thickness over the patterned thin film;

thinning the first thickness of the sheet of glass to less than 0.5 mm; and

removing the protective layer of material from the surface of the sheet of glass.

2. The method of claim 1, further comprising:

thinning the second thickness of the protective layer of material to less than 0.5 mm.

3. The method of claim 2, wherein the thinning of the first and second thicknesses occur concurrently.

4. The method of claim 1, wherein the protective layer of material comprises a laminate.

5. The method of claim 1, wherein the thinning comprises thinning a second major surface of the sheet of glass opposite the first major surface having the protective layer applied thereon.

6. The method of claim 1, wherein the removing comprising at least one of chemical etching and mechanical polishing.

7. The method of claim 1, wherein the sheet of glass with the patterned thin film is part of a touch sensor panel.

8. The method of claim 1, wherein the sheet of glass with the patterned thin film is part of a display device for a computing device.

9. The method of claim 5, wherein the method further comprises:

after the thinning of the second major surface of the sheet of substrate material, applying a thin film layer on the second major surface of the sheet of glass opposite the patterned surface.

10. A method for fabricating a thin sheet of substrate material comprising:

providing a sheet of substrate material having a first thickness of at least 0.5 mm;

applying a patterned thin film on a first major surface of the sheet of substrate material;

applying a protective layer of material having a second thickness over the patterned thin film on the first major surface of the sheet of substrate material; and

thinning the first thickness of the sheet of substrate material.

11. The method of claim 10, wherein the thinning comprises thinning the first thickness to less than 0.5 mm.

12. The method of claim 11, further comprising:

thinning the second thickness of the protective layer of material to less than 0.5 mm.

13. The method of claim 12, wherein the thinning of the first and second thicknesses occur concurrently.

14. The method of claim 10, wherein the method further comprises:

removing the protective layer of material from the surface of the sheet of substrate material.

15. The method of claim 14, wherein the removing comprising at least one of chemical etching and mechanical polishing.

16. The method of claim 14, wherein the protective layer of material comprises a laminate.

17. The method of claim 14, wherein the thinning comprises thinning a second major surface of the sheet of substrate material opposite the first major surface having the protective layer applied thereon.

18. The method of claim 17, wherein the method further comprises:

after the thinning of the second major surface of the sheet of substrate material, applying a thin film layer on the second major surface of the sheet of substrate material opposite the patterned surface.

19. The method of claim 10, wherein the substrate material with the patterned thin film is part of a touch sensor panel.

20. The method of claim 10, wherein the substrate material with the patterned thin film is part of a display device for a computing device.