DISPLAY COVER FOR DIGITAL WRITING AND OPTICAL PERFORMANCE

• US 20200132892A1
• Filed: 12/27/2019
• Published: 04/30/2020
• Est. Priority Date: 12/27/2019
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Kulkarni, Shantanu D., Ghosh, Prosenjit, Rosenzweig, Michael Daniel, Larsen, Denica N.
• Granted Patent: US 11,313,998 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/0221 the surface having an irregular structure G02B5/0226 takes precedence
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/0294 adapted to provide an additional optical effect, e.g. anti-reflection or filter
• CPC Class Codes: G06V 30/1423 the instrument generating sequences of position coordinates corresponding to handwriting preprocessing or recognising digital ink G06V30/32

Abstract

An embodiment of a method of manufacturing a cover lens for an electronic display includes etching a first surface geometry on a first surface of the cover lens. In the embodiment, the method includes determining a plurality of angles of refraction at the first surface from light generated from the electronic display based on the first surface geometry. In the embodiment, the method includes determining a second surface geometry for a second surface of the cover lens based on the plurality of angles of refraction at the first surface. In the embodiment, the method includes etching the second surface geometry on the second surface of the cover lens.

Claims

1. A method of manufacturing a cover lens for an electronic display, comprising:

etching a first surface geometry on a first surface of the cover lens;

determining a plurality of angles of refraction at the first surface from light generated from the electronic display based on the first surface geometry;

determining a second surface geometry for a second surface of the cover lens based on the plurality of angles of refraction at the first surface; and

etching the second surface geometry on the second surface of the cover lens.

2. The method of claim 1, wherein the first surface comprises a surface roughness having a root mean square height between 0.3 and 0.7 microns.

3. The method of claim 1, wherein determining the second surface geometry comprises:

determining, prior to etching the second surface geometry, that the second surface geometry satisfies at least one of a threshold haze, a threshold clarity, and a threshold transmittance; and

etching, in response to determining that at least one of the threshold haze, the threshold clarity, and the threshold transmittance is satisfied, the second surface geometry on the second surface of the cover lens.

4. The method of claim 3, wherein the threshold haze of the cover lens is less than thirty percent.

5. The method of claim 3, wherein the threshold transmittance is greater than ninety percent.

6. The method of claim 3, further comprising:

determining, in response to determining that the second surface geometry does not satisfy at least one of the threshold haze, the threshold clarity, and the threshold transmittance is satisfied, a second plurality of angles of refraction at the first surface; and

determining a third surface geometry for the second surface of the cover lens based on the second plurality of angles of refraction at the first surface.

7. The method of claim 6, further comprising etching the third surface geometry on the second surface of the cover lens.

8. The method of claim 6, further comprising:

determining that the third surface geometry satisfies at least one of the threshold haze, the threshold clarity, and the threshold transmittance is satisfied; and

etching, in response to determining at least one of the threshold haze, the threshold clarity, and the threshold transmittance is satisfied, the third surface geometry on the second surface of the cover lens.

9. A cover lens for an electronic display, comprising:

a first surface geometry on a first surface of the cover lens, the first surface geometry configured to interact with a writing utensil, the first surface geometry comprising a surface roughness including a root mean square height in a range from 0.3 to 0.7 microns; and

a second surface geometry on a second surface of the cover lens, wherein;

the second surface geometry is configured to refract a ray of light moving in a first direction to a second direction; and

the first surface geometry is configured to refract the ray of light moving in the second direction to a third direction, the third direction substantially parallel to the first direction.

10. The cover lens of claim 9, wherein the first surface geometry is chemically etched.

11. The cover lens of claim 9, wherein a kinetic coefficient of friction between the writing utensil and the first surface geometry is in a range between 0.1 and 0.25.

12. The cover lens of claim 9, wherein a thickness measured between the first surface geometry and the second surface geometry is in a range between 0.4 and 0.7 millimeters.

13. The cover lens of claim 9, wherein the first surface geometry comprises a set of peaks and a set of valleys.

14. The cover lens of claim 9, wherein the second surface geometry comprises a set of peaks and a set of valleys.

15. The cover lens of claim 9, wherein the second surface geometry is chemically etched.

16. The cover lens of claim 9, wherein the second surface is an opposite surface from the first surface.

17. An electronic display system, comprising:

a electronic display configured to generate a plurality of light rays moving in a first direction;

a cover lens coupled to the electronic display, comprising;

a first surface geometry on a first surface of the cover lens, the first surface geometry configured to interact with a writing utensil, the first surface geometry comprising a surface roughness including a root mean square height in a range from 0.3 to 0.7 microns; and

a second surface geometry on a second surface of the cover lens, wherein;

the second surface geometry is configured to refract at least one light ray of the plurality of light rays moving in the first direction to a second direction; and

the first surface geometry is configured to refract the at least one light ray moving in the second direction to a third direction, the third direction substantially parallel to the first direction.

18. The electronic display system of claim 17, wherein a transmittance through the cover lens is at least ninety percent.

19. The electronic display system of claim 17, wherein a haze of the cover lens is lower than thirty percent.

20. The electronic display system of claim 17, wherein the cover lens is adhesively coupled to the electronic display.