Display for mobile device with abrasion resistant siloxane coating

• US 9,471,172 B2
• Filed: 03/07/2014
• Issued: 10/18/2016
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Sirois, Ernest J.
• Primary Examiner(s): Zhang, Ruiyun
• Application Number:
  US14/200,408
• Publication Number:
  US 20140267952A1
• Time in Patent Office: 956 Days
• Field of Search: 428/1.1, 428/1.3, 428/1.32, 428/1.51, 428/1.52, 428/216, 428/217, 428/408, 156/60
• US Class Current: 1/1
• CPC Class Codes: B05D 7/04 to surfaces of films or sheets producing layered products by applying coatings of pasty or pulverulent plastics B29C41/00
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/051 Inorganic, e.g. glass or silicon oxide
• CPC Class Codes: C09K 2323/053 Organic silicon compound, e.g. organosilicon
• CPC Class Codes: C23C 14/12 Organic material
• CPC Class Codes: C23C 16/26 Deposition of carbon only
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 428/24983 Hardness

Abstract

An abrasion resistant coating (206) is applied to a display (202) of a mobile device (200). In an embodiment, the coating (140) includes a first layer (106B) including siloxane; a second layer (106A) including siloxane, wherein the second layer has opposing sides and a hardness greater than the first layer; and a third layer (104) including an amorphous carbon selected from a diamond-like carbon and a diamond-like nano-composite. The first layer (106B) and third layer (104) are positioned on opposing sides of the second layer (106A). The third layer (104) has a hardness greater than the second layer (106A).

Claims

1. A film comprising:

a substrate;

a siloxane layer comprising a siloxane-organic interpenetrating network contacting the substrate, the siloxane layer having a hardness greater than a hardness of the substrate;

another siloxane layer comprising a siloxane-organic interpenetrating network contacting the siloxane layer, the another siloxane layer having a hardness greater than the hardness of the siloxane layer, the siloxane layer and the another siloxane layer having a combined thickness of at least 20 microns; and

a diamond-like nano-composite layer comprising an amorphous carbon and a siloxane contacting the another siloxane layer, the diamond-like nano-composite layer having a hardness greater than the hardness of the another siloxane layer.

2. The film of claim 1, wherein the substrate is a plastic.

3. The film of claim 2, wherein the substrate is selected from the group consisting of poly(methyl methacrylate), polycarbonate, and co-extrusions of poly(methyl methacrylate) and polycarbonate.

4. The film of claim 1, wherein the substrate is flexible.

5. The film of claim 1, wherein the another siloxane layer has a thickness between 5 microns to 25 microns.

6. The film of claim 1, further comprising a hydrophobic treatment layer contacting the diamond-like nano-compo site layer.

7. The film of claim 1, wherein the combined thickness is less than 75 microns.

8. The film of claim 1, wherein the amorphous carbon is an amorphous hydrogenated diamond-like carbon.

9. The film of claim 1, wherein the siloxane layer or the another siloxane layer comprise an interpenetrating network of a siloxane and an acrylic.

10. The film of claim 1, wherein the diamond-like nano-composite layer has a thickness between 3 microns and 20 microns.

11. A method of producing a film for a substrate comprising:

providing the substrate;

applying a siloxane layer comprising a siloxane-organic interpenetrating network contacting the substrate, the siloxane layer having a hardness greater than a hardness of the substrate;

applying another siloxane layer comprising a siloxane-organic interpenetrating network contacting the siloxane layer, the another siloxane layer having a hardness greater than the hardness of the siloxane layer, the siloxane layer and the another siloxane layer having a combined thickness of at least 20 microns; and

applying a diamond-like nano-composite layer comprising an amorphous carbon and a siloxane contacting the another siloxane layer, the diamond-like nano-composite layer having a hardness greater than the hardness of the another siloxane layer.

12. The method of claim 11, wherein the substrate is a co-extrusion of poly(methyl methacrylate) and polycarbonate.

13. The method of claim 11, wherein the substrate is a plastic lens.

14. The method of claim 11, wherein the substrate is affixed to a plastic lens.

15. The method of claim 11, wherein the substrate is affixed to a touch screen and display assembly.

16. The method of claim 11, wherein the siloxane layer and the another siloxane layer have a combined thickness of less than 75 microns.

17. The method of claim 11, wherein the diamond-like nano-composite layer is applied to the siloxane layer by a chemical vapor deposition process.

18. The method of claim 17, wherein the chemical vapor deposition process is selected from ion beam plasma enhanced chemical vapor deposition and plasma enhanced chemical vapor deposition.

19. The method of claim 11, wherein the siloxane layer comprises an interpenetrating network of a siloxane and an acrylic.

20. The method of claim 11, wherein the siloxane layer comprises from 25 wt.% to 50 wt.% siloxane.