Patterned electrodes for electroactive liquid-crystal ophthalmic devices

• US 20050231677A1
• Filed: 04/11/2005
• Published: 10/20/2005
• Est. Priority Date: 04/13/2004
• Status: Abandoned Application

• Current Assignee: Arizona Board of Regents (University of Arizona)
• Original Assignee: Arizona Board of Regents (University of Arizona)
• Inventors: Meredith, Gerald
• Application Number:
  US11/102,942
• Publication Number:
  US 20050231677A1
• Time in Patent Office: Days
• US Class Current: 349/143
• CPC Class Codes: G02B 3/14 of variable focal length
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection
• CPC Class Codes: G02F 1/294 Variable focal length devices
• CPC Class Codes: G02F 2203/28 focussing or defocussing

Abstract

Provided is an electroactive device comprising: a liquid crystal layer enclosed between a pair of transparent substrates; one or more patterned electrode sets positioned between the liquid crystal layer and the inward-facing surface of the first transparent substrate, said patterned electrode sets each comprising two or more electrodes forming an opposing pattern, said electrodes separated by an insulating layer, wherein there is no horizontal gap between the electrodes forming the patterned electrode set; and a conductive layer between the liquid crystal layer and the inward-facing surface of the second transparent substrate. The device provides greater efficiency than conventional devices.

Claims

1. An electroactive device comprising:

a liquid crystal layer enclosed between a pair of transparent substrates;

one or more patterned electrode sets positioned between the liquid crystal layer and the inward-facing surface of the first transparent substrate, said patterned electrode sets each comprising two or more electrodes forming an opposing pattern, said electrodes separated by an insulating layer, wherein there is no horizontal gap between the electrodes forming the patterned electrode set; and

a conductive layer between the liquid crystal layer and the inward-facing surface of the second transparent substrate.

2. The device of claim 1, wherein a patterned electrode set forms a circular pattern.

3. The device of claim 1, wherein a patterned electrode set forms an elliptical pattern.

4. The device of claim 1, comprising two non-overlapping patterned electrode sets.

5. The device of claim 1, wherein the liquid crystal is E7.

6. The device of claim 1, wherein the transparent substrates are glass.

7. The device of claim 1, wherein the transparent substrates are plastic.

8. The device of claim 1, further comprising an electrical control electrically connected to the patterned electrode sets and the conductive layer.

9. The device of claim 8, further comprising a range-finding device electrically connected to the electrical control.

10. The device of claim 1, wherein the electrodes and conductive layer are indium-tin-oxide.

11. The device of claim 1, further comprising an alignment layer surrounding the liquid crystal layer.

12. The device of claim 11, wherein the alignment layer is polyvinyl alcohol.

13. The device of claim 11, wherein the alignment layer is nylon 6,6.

14. The device of claim 1, wherein the transparent substrates are between about 3 and about 20 microns apart.

15. The device of claim 14, wherein the transparent substrates are between about 3 and about 8 microns apart.

16. A method of diffracting light comprising:

applying a voltage to the device of claim 1, whereby the phase of light transmitted through the transparent substrates is altered.

17. The method of claim 16, wherein the voltage applied is less than or equal to 2 Vrms.

18. A method of adjusting the diffraction in a device comprising a liquid crystal layer enclosed between a pair of transparent substrates;

one or more patterned electrode sets positioned between the liquid crystal layer and the inward-facing surface of the first transparent substrate, said patterned electrode sets each comprising two or more electrodes forming an opposing pattern, said electrodes separated by an insulating layer, wherein there is no horizontal gap between the electrodes forming the patterned electrode set;

a conductive layer between the liquid crystal layer and the inward-facing surface of the second transparent substrate; and

an electrical control electrically connected to the patterned electrode sets and the conductive layer;

said method comprising;

determining the desired amount of diffraction;

applying a voltage to the patterned electrode set and conductive layer so that the device has the desired amount of diffraction.

19. The method of claim 18, wherein the desired amount of diffraction is determined using a range-finding device to determine the distance between the device and a desired object and correlating the distance with the voltage applied.

20. A patterned electrode comprising:

a substrate;

one or more areas of conductive material arranged in a pattern on said substrate;

one or more areas of insulating material arranged in a complementary pattern with said areas of conductive material on said substrate.

21. The patterned electrode of claim 20, wherein the pattern is circular.

22. The patterned electrode of claim 20, wherein the pattern is angular.

23. The patterned electrode of claim 20, wherein the pattern is semicircular.

25. The patterned electrode set of claim 24, wherein the two or more electrodes are the electrodes of claim 20.

24. A patterned electrode set comprising two or more electrodes forming an opposing pattern, said electrodes separated by an insulating layer, wherein there is no horizontal gap between the electrodes forming the patterned electrode set.