Microlens-array, production method thereof, and liquid crystal display device using the same

• US 5,886,760 A
• Filed: 01/10/1997
• Issued: 03/23/1999
• Est. Priority Date: 01/10/1996
• Status: Expired due to Fees

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Shimizu, Akiko, Ueda, Kayoko
• Primary Examiner(s): Dang, Hung X.
• Assistant Examiner(s): NGUYEN, TIEP HUU
• Application Number:
  US08/782,492
• Time in Patent Office: 802 Days
• Field of Search: 349/95, 359/619, 359/620, 359/455, 359/456, 264/2.5
• US Class Current: 349/95
• CPC Class Codes: G02B 3/0012 characterised by the manufacturing method
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/133562 on the viewer side

Abstract

A microlens-array containing a mesh-like sheet and an optically-transparent resin formed at apertures of the mesh-like sheet, wherein the resin formed at each aperture has a concave lens shape; and method for production thereof. A liquid crystal display device using the aforementioned microlens-array.

Claims

1. A microlens-array comprising a mesh-like sheet and an optically-transparent resin formed at apertures of the mesh-like sheet, wherein the optically-transparent resin formed at each aperture has a concave lens shape and wherein the optically-transparent resin is prepared by polymerizing at least one polymerizable compound or a composition containing the at least one polymerizable compound, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 5 Pa·

s or less prior to polymerization.

2. The microlens-array according to claim 1, wherein the mesh-like sheet has a mesh size of from 100 to 600 mesh.

3. The microlens-array according to claim 1, wherein the mesh-like sheet is covered or dyed with a shading material.

4. The microlens-array according to claim 1, wherein the mesh-like sheet comprises a woven fabric.

5. The microlens-array according to claim 1, wherein the mesh-like sheet comprises printing lattices made by screen printing.

6. The microlens-array according to claim 1, wherein the mesh-like sheet comprises fibers selected from the group consisting of cotton, linen, silk, nylon, polyester, polyethylene, polypropylene, stainless steel and glass fibers.

7. The microlens-array according to claim 6, wherein the mesh-like sheet comprises fibers selected from the group consisting of nylon and polyester fibers.

8. The microlens-array according to claim 1, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 3 Pa·

s or less prior to polymerization.

9. The microlens-array according to claim 1, wherein the wherein the optically-transparent resin formed at each aperture has a plano-concave lens shape.

10. A method of producing a microlens-array, comprising the steps of:

(i) mounting a mesh-like sheet on an optically-transparent substrate;

(ii) applying at least one polymerizable compound or a composition containing the at least one polymerizable compound onto the mesh-like sheet, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 5 Pa·

s or less prior to polymerization, and wherein the at least one polymerizable compound is formed at each aperture of the mesh-like sheet, has a concave lens shape at each aperture and is optically-transparent upon polymerization thereof; and

(iii) polymerizing the at least one polymerizable compound.

11. The microlens-array according to claim 10, wherein the mesh-like sheet comprises a woven fabric.

12. The method of producing a microlens-array according to claim 10, wherein the mesh-like sheet comprises printing lattices made by screen printing.

13. The method of producing a microlens-array according to claim 10, wherein the mesh-like sheet comprises fibers selected from the group consisting of cotton, linen, silk, nylon, polyester, polyethylene, polypropylene, stainless steel and glass fibers.

14. The method of producing a microlens-array according to claim 13, wherein the mesh-like sheet comprises fibers selected from the group consisting of nylon and polyester fibers.

15. The method of producing a microlens-array according to claim 10, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 3 Pa·

s or less prior to polymerization.

16. The method of producing a microlens-array according to claim 10, wherein the optically-transparent resin formed at each aperture has a plano-concave lens shape.

17. The method of producing a microlens-array according to claim 10, further comprising the step of applying heat during the applying step (ii).

18. A method of producing a microlens-array, comprising the steps of:

(i) applying at least one polymerizable compound or a composition containing the at least one polymerizable compound to an optically-transparent substrate, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 5 Pa·

s or less prior to polymerization, and wherein the at least one polymerizable compound is optically-transparent upon polymerization thereof;

(ii) mounting a mesh-like sheet thereon, wherein the at least one polymerizable compound is formed at each aperture of the mesh-like sheet and has a concave lens shape at each aperture; and

(iii) polymerizing the at least one polymerizable compound.

19. The microlens-array according to claim 18, wherein the mesh-like sheet comprises a woven fabric.

20. The method of producing a microlens-array according to claim 18, wherein the mesh-like sheet comprises printing lattices made by screen printing.

21. The method of producing a microlens-array according to claim 18, wherein the mesh-like sheet comprises fibers selected from the group consisting of cotton, linen, silk, nylon, polyester, polyethylene, polypropylene, stainless steel and glass fibers.

22. The method of producing a microlens-array according to claim 21, wherein the mesh-like sheet comprises fibers selected from the group consisting of nylon and polyester fibers.

23. The method of producing a microlens-array according to claim 18, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 3 Pa·

s or less prior to polymerization.

24. The method of producing a microlens-array according to claim 18, wherein the wherein the optically-transparent resin formed at each aperture has a plano-concave lens shape.

25. The method of producing a microlens-array according to claim 18, further comprising the step of applying heat during the steps (i) and (ii).

26. A liquid crystal display device comprising a light source unit, a liquid crystal cell and a microlens-array provided at the side from which the liquid crystal cell is observed by an observer, wherein the microlens-array comprises a mesh-like sheet and an optically-transparent resin formed at apertures of the mesh-like sheet, and wherein the optically-transparent resin formed at each aperture of the mesh-like sheet has a concave lens shape, wherein the optically-transparent resin is prepared by polymerizing at least one polymerizable compound or a composition containing the at least one polymerizable compound, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 5 Pa·

s or less prior to polymerization.

27. The liquid crystal display device according to claim 26, wherein the microlens-array is provided directly on a substrate comprising the liquid crystal cell.

28. The liquid crystal display device according to claim 26, wherein the mesh-like sheet has a mesh size of from 100 to 600 mesh.

29. The liquid crystal display device according to claim 26, wherein the mesh-like sheet is covered or dyed with a shading material.

30. The liquid crystal display device according to claim 26, wherein the mesh-like sheet comprises a woven fabric.

31. The liquid crystal display device according to claim 26, wherein the mesh-like sheet comprises printing lattices made by screen printing.

32. The liquid crystal display device according to claim 26, wherein the mesh-like sheet comprises fibers selected from the group consisting of cotton, linen, silk, nylon, polyester, polyethylene, polypropylene, stainless steel and glass fibers.

33. The liquid crystal display device according to claim 32, wherein the mesh-like sheet comprises fibers selected from the group consisting of nylon and polyester fibers.

34. The liquid crystal display device according to claim 26, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 3 Pa·

s or less prior to polymerization.

35. The liquid crystal display device according to claim 26, wherein the wherein the optically-transparent resin formed at each aperture has a plano-concave lens shape.

36. A liquid crystal display device comprising a light source unit, a back side polarizing plate, a liquid crystal cell, a front side polarizing plate and a microlens-array, wherein the microlens-array is provided at the side from which the liquid crystal cell is observed by an observer and is located closer to the observer than the front side polarizing plate;

and wherein the microlens-array comprises a mesh-like sheet and an optically-transparent resin formed at apertures of the mesh-like sheet and the optically-transparent resin formed at each aperture has a concave lens shape, wherein the optically-transparent resin is prepared by polymerizing at least one polymerizable compound or a composition containing the at least one polymerizable compound, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 5 Pa·

s or less prior to polymerization.

37. The liquid crystal display device according to claim 36, wherein the microlens-array is provided directly on the front side polarizing plate.

38. The liquid crystal display device according to claim 36, wherein the mesh-like sheet has a mesh size of from 100 to 600 mesh.

39. The liquid crystal display device according to claim 36, wherein the mesh-like sheet is covered or dyed with a shading material.

40. The liquid crystal display device according to claim 36, wherein the mesh-like sheet comprises a woven fabric.

41. The liquid crystal display device according to claim 36, wherein the mesh-like sheet comprises printing lattices made by screen printing.

42. The liquid crystal display device according to claim 36, wherein the mesh-like sheet comprises fibers selected from the group consisting of cotton, linen, silk, nylon, polyester, polyethylene, polypropylene, stainless steel and glass fibers.

43. The liquid crystal display device according to claim 42, wherein the mesh-like sheet comprises fibers selected from the group consisting of nylon and polyester fibers.

44. The liquid crystal display device according to claim 36, wherein the at least one polymerization compound and the composition containing the at least one polymerization compound each has a viscosity of 3 Pa·

s or less prior to polymerization.

45. The liquid crystal display device according to claim 36, wherein the wherein the optically-transparent resin formed at each aperture has a plano-concave lens shape.