Electro-active lens

• US 7,728,949 B2
• Filed: 01/22/2008
• Issued: 06/01/2010
• Est. Priority Date: 01/22/2007
• Status: Active Grant

• Current Assignee: Carl Zeiss Vision International GMBH (Carl-Zeiss-Stiftung)
• Original Assignee: Pixeloptics Incorporated
• Inventors: Carmichael, Allan, Clarke, Roger, Kokonaski, William, Haddock, Joshua N.
• Primary Examiner(s): QI, ZHI QIANG
• Application Number:
  US12/018,048
• Publication Number:
  US 20080180630A1
• Time in Patent Office: 861 Days
• Field of Search: 349/201, 349/200, 349/175
• US Class Current: 349/201
• CPC Class Codes: G02C 2202/20 Diffractive and Fresnel lenses or lens portions
• CPC Class Codes: G02C 2202/22 Correction of higher order and chromatic aberrations, wave front measurement and calculation
• CPC Class Codes: G02C 7/083 Electrooptic lenses
• CPC Class Codes: G02F 1/1313 specially adapted for a particular application
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection

Abstract

Embodiments of the present invention relate to a cholesteric liquid crystalline material which may be usable in an electro-active element for providing fail safe operation, polarization insensitivity, low electrical power consumption requirements, and a small number of electrical connections. The cholesteric liquid crystalline material may be usable in an electro-active element for providing a diffractive efficiency or focusing efficiency above 90% in an activated state of the electro-active element and a diffractive efficiency or focusing efficiency below 10% in a deactivated state of the electro-active element.

Claims

1. An electro-active lens, comprising:

a single layer of an electro-active material, wherein the electro-active lens has an optical power in an activated state, and wherein the electro-active lens has substantially no optical power in a deactivated state,

the electro-active lens, further comprising;

a first substrate having a first index of refraction; and

a second substrate having said first index of refraction, wherein said electro-active material is disposed between said first and said second substrates, and wherein said electro-active material has a second index of refraction approximately equal to said first index of refraction when the electro-active lens is in said deactivated state;

wherein said first substrate is a surface relief diffractive element; and

wherein the electro-active lens has a diffraction efficiency in said deactivated state of less than approximately 10%.

2. The electro-active lens of claim 1, wherein the electro-active lens has a diffraction efficiency in said deactivated state of less than approximately 5%.

3. The electro-active lens of claim 1, further comprising:

a continuous electrode disposed on the side of said first substrate facing said electro-active material; and

one or more electrodes disposed on the side of said second substrate facing said electro-active material.

4. The electro-active lens of claim 3, wherein said one or more electrodes are patterned.

5. The electro-active lens of claim 3, wherein said one or more electrodes are pixilated.

6. The electro-active lens of claim 1, further comprising a base lens, wherein said base lens is selected from the group consisting of:

a finished lens blank, a semi-finished lens blank, an unfinished lens blank, a single focus lens, and a multifocal lens.

7. An electro-active lens, comprising:

a single layer of an electro-active material, wherein the electro-active lens has an optical power in an activated state, and wherein the electro-active lens has substantially no optical power in a deactivated state,

the electro-active lens, further comprising;

a first substrate having a first index of refraction; and

a second substrate having said first index of refraction, wherein said electro-active material is disposed between said first and said second substrates, and wherein said electro-active material has a second index of refraction approximately equal to said first index of refraction when the electro-active lens is in said deactivated state;

wherein said first substrate is a surface relief diffractive element; and

wherein the electro-active lens has a diffraction efficiency in said activated state of greater than approximately 90%.

8. An electro-active lens, comprising:

a single layer of an electro-active material, wherein the electro-active lens has an optical power in an activated state, and wherein the electro-active lens has substantially no optical power in a deactivated state;

wherein said electro-active material is a cholesteric liquid crystalline material;

wherein said cholesteric liquid crystalline material is comprised of a nematic liquid crystal and a chiral doping agent; and

wherein said nematic liquid crystal has a birefringence of approximately 0.20 or higher, and wherein said chiral doping agent has a helical twisting power with a magnitude of approximately 1.1 or higher.

9. The electro-active lens of claim 8, wherein said nematic liquid crystal is selected from the group consisting of:

BL036, BL037, BL038, BL087, BL093, BL111, TL213, TL216, E7, E63, MLC-6621-000, MLC-6621-100, ZLI-5049-000, and ZLI-5049-100.

10. The electro-active lens of claim 8, wherein said chiral doping agent is selected from the group consisting of:

C15, CB15, ZLI-811, ZLI-3786, ZLI-4571, ZLI-4572, MLC-6247, and MLC-6248.

11. An electro-active lens, comprising:

a single layer of an electro-active material, wherein the electro-active lens has an optical power in an activated state, and wherein the electro-active lens has substantially no optical power in a deactivated state;

wherein said electro-active material is a cholesteric liquid crystalline material;

wherein said cholesteric liquid crystalline material is comprised of a nematic liquid crystal and a chiral doping agent; and

wherein the cholesteric liquid crystalline material has approximately 10% ZLI-4571 or less by weight.

12. An electro-active lens, comprising:

a single layer of an electro-active material, wherein the electro-active lens has an optical power in an activated state, and wherein the electro-active lens has substantially no optical power in a deactivated state;

wherein said electro-active material is a cholesteric liquid crystalline material;

wherein said cholesteric liquid crystalline material is comprised of a nematic liquid crystal and a chiral doping agent; and

wherein the cholesteric liquid crystalline material has a twist pitch of approximately 0.10 μ

m or greater.

13. An electro-active lens, comprising:

a single layer of an electro-active material, wherein the electro-active lens has an optical power in an activated state, and wherein the electro-active lens has substantially no optical power in a deactivated state,

the electro-active lens, further comprising;

a first substrate having a first index of refraction; and

a second substrate having said first index of refraction, wherein said electro-active material is disposed between said first and said second substrates, and wherein said electro-active material has a second index of refraction approximately equal to said first index of refraction when the electro-active lens is in said deactivated state; and

wherein said first substrate and said second substrate have a first dispersion of said first index of refraction, and wherein said electro-active material has a second dispersion of said second index of refraction, and wherein said first dispersion of said first index of refraction is substantially equal to second dispersion of said second index of refraction.

14. A cholesteric liquid crystalline material, comprising:

a nematic liquid crystal having a birefringence of approximately 0.20 or higher; and

a chiral doping agent having a helical twisting power with a magnitude of approximately 1.1 or higher.

15. The cholesteric liquid crystalline material of claim 14, wherein said nematic liquid crystal is selected from the group consisting of:

BL036, BL037, BL038, BL087, BL093, BL111, TL213, TL216, E7, E63, MLC-6621-000, MLC-6621-100, ZLI-5049-000, and ZLI-5049100.

16. The cholesteric liquid crystalline material of claim 14, wherein said chiral doping agent is selected from the group consisting of:

C15, CB15, ZLI-811, ZLI-3786, ZLI-4571, ZLI4572, MLC-6247, and MLC-6248.

17. The cholesteric liquid crystalline material of claim 14, wherein the cholesteric liquid crystalline material has approximately 10% ZLI-4571 or less by weight.

18. The cholesteric liquid crystalline material of claim 14, wherein the cholesteric liquid crystalline material has a twist pitch of approximately 0.10 μ

m or greater.

19. An electro-active element, comprising:

a first substrate having an index of refraction and a first dispersion of said index of refraction;

a second substrate having said index of refraction and said first dispersion of said index of refraction;

a cholesteric liquid crystalline material disposed between said first and said second substrates, wherein said cholesteric liquid crystalline material has an average index of refraction approximately equal to said index of refraction and a second dispersion of said average index of refraction approximately equal to said first dispersion of said index of refraction;

a continuous electrode disposed on the side of said first substrate facing said cholesteric liquid crystalline material; and

one or more electrodes disposed on the side of said second substrate facing said cholesteric liquid crystalline material.

20. The electro-active element of claim 19, wherein said cholesteric liquid crystalline material is comprised of a nematic liquid crystal and a chiral doping agent.

21. The electro-active element of claim 20, wherein said nematic liquid crystal has a birefringence of approximately 0.20 or higher, and wherein said chiral doping agent has a helical twisting power with a magnitude of approximately 1.1 or higher.

22. The electro-active element of claim 20, wherein said nematic liquid crystal is selected from the group consisting of:

BL036, BL037, BL038, BL087, BL093, BL111, TL213, TL216, E7, E63, MLC-6621-000, MLC-6621-100, ZLI-5049-000, and ZLI-5049-100.

23. The electro-active element of claim 20, wherein said chiral doping agent is selected from the group consisting of:

C15, CBI5, ZLI-811, ZLI-3786, ZLI-4571, ZLI-4572, MLC-6247, and MLC-6248.

24. The electro-active element of claim 20, wherein the cholesteric liquid crystalline material has approximately 10% ZLI-4571 or less by weight.

25. The electro-active element of claim 20, wherein the cholesteric liquid crystalline material has a twist pitch of approximately 0.10 μ

m or greater.

26. The electro-active element of claim 19, wherein said first substrate is a surface relief optic.

27. The electro-active element of claim 26, wherein said first substrate is a surface relief refractive optic.

28. The electro-active element of claim 26, wherein said first substrate is a surface relief diffractive optic having a zone height.

29. The electro-active element of claim 28, wherein said zone height is approximately equal to an operative wavelength of the electro-active element divided by the difference of said index of refraction and an ordinary index of refraction of said cholesteric liquid crystalline material.

30. The electro-active element of claim 28, wherein the electro-active element has a diffraction efficiency in a deactivated state of less than approximately 10%.

31. The electro-active element of claim 30, wherein the electro-active element has a diffraction efficiency in a deactivated state of less than approximately 5%.

32. The electro-active element of claim 19, wherein said one or more electrodes are patterned.

33. The electro-active element of claim 19, wherein said one or more electrodes are pixilated.

34. The electro-active element of claim 19, wherein the electro-active element has a diffraction efficiency in an activated state of greater than approximately 90%.

35. An electro-active lens, comprising:

a base lens; and

an electro-active lens in optical communication with said base lens, comprising a first substrate having an index of refraction and a first dispersion of said index of refraction;

a second substrate having said index of refraction and said first dispersion of said index of refraction;

a cholesteric liquid crystalline material disposed between said first and said second substrates, wherein said cholesteric liquid crystalline material has an average index of refraction approximately equal to said index of refraction and a second dispersion of said average index of refraction approximately equal to said first dispersion of said index of refraction;

a continuous electrode disposed on the side of said first substrate facing said cholesteric liquid crystalline material; and

one or more electrodes disposed on the side of said second substrate facing said cholesteric liquid crystalline material.

36. The electro-active lens of claim 35, wherein said cholesteric liquid crystalline material is comprised of a nematic liquid crystal and a chiral doping agent.

37. The electro-active lens of claim 36, wherein said nematic liquid crystal has a birefringence of approximately 0.20 or higher, and wherein said chiral doping agent has a helical twisting power with a magnitude of approximately 1.1 or higher.

38. The electro-active lens of claim 36, wherein said nematic liquid crystal is selected from the group consisting of:

BL036, BL037, BL038, BL087, BL093, BL111, TL213, TL216, E7, E63, MLC-6621-000, MLC-6621-100, ZLI-5049-000, and ZLI-5049-100.

39. The electro-active lens of claim 36, wherein said chiral doping agent is selected from the group consisting of:

C15, CB15, ZLI-811, ZLI-3786, ZLI-4571, ZLI-4572, MLC-6247, and MLC-6248.

40. The electro-active lens of claim 36, wherein the cholesteric liquid crystalline material has approximately 10% ZLI-4571 or less by weight.

41. The electro-active lens of claim 36, wherein the cholesteric liquid crystalline material has a twist pitch of approximately 0.10 μ

m or greater.

42. The electro-active lens of claim 35, wherein said first substrate is a surface relief optic.

43. The electro-active lens of claim 42, wherein said first substrate is a surface relief refractive optic.

44. The electro-active lens of claim 42, wherein said first substrate is a surface relief diffractive optic having a zone height.

45. The electro-active lens of claim 44, wherein said zone height is approximately equal to an operative wavelength of the electro-active element divided by the difference of said index of refraction and an ordinary index of refraction of said cholesteric liquid crystalline material.

46. The electro-active lens of claim 44, wherein the electro-active element has a diffraction efficiency in a deactivated state of less than approximately 10%.

47. The electro-active lens of claim 46, wherein the electro-active element has a diffraction efficiency in a deactivated state of less than approximately 5%.

48. The electro-active lens of claim 35, wherein said one or more electrodes are patterned.

49. The electro-active lens of claim 35, wherein said one or more electrodes are pixilated.

50. The electro-active lens of claim 35, wherein the electro-active element has a diffraction efficiency in an activated state of greater than approximately 90%.

51. The electro-active lens of claim 35, wherein said base lens is selected from the group consisting of:

a finished lens blank, a semi-finished lens blank, an unfinished lens blank, a single focus lens, and a multifocal lens.