Device having combined diffusing, collimating, and color mixing light control function

• US 20070110386A1
• Filed: 11/12/2005
• Published: 05/17/2007
• Est. Priority Date: 11/12/2005
• Status: Abandoned Application

• Current Assignee: Emphasis Materials Limited
• Original Assignee: Emphasis Materials Limited
• Inventors: Chiang, Tien-Hon
• Application Number:
  US11/272,905
• Publication Number:
  US 20070110386A1
• Time in Patent Office: Days
• US Class Current: 385/147
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0242 by means of dispersed particles
• 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: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A light control device for a light source unit having a specific spatial intensity and/or spectral distribution is provided herein. The light control device is positioned on the path of the light from the light source unit and contains at least one of three light control functions, namely the diffusion, collimation, and color mixing, which has a spatial distribution of its processing power corresponding to the spatial intensity and/or spectral distribution of the incident light. The light control device could also directly or interactively combine two or more of the light control functions into a single device. At least one of the combined light control functions of the device has a spatial distribution of its processing power corresponding to the spatial intensity and/or spectral distribution of the incident light to the device.

Claims

1. A light control device on a path of the light from a light source unit, comprising:

(a) a transparent substrate having a light incidence plane and a light emission plane; and

(b) a diffuser structure;

wherein the light from said light source unit enters said transparent substrate through said light incidence plane, and is scattered by said diffuser structure in various directions, and exits said transparent substrate through said light emission plane; and

said diffuser structure has a spatial distribution characterized by the degree of haze corresponding to a spatial intensity distribution of the light from said light source unit.

2. The light control device according to claim 1, wherein said diffuser structure is configured on said light incidence plane.

3. The light control device according to claim 1, wherein said diffuser structure is configured on said light emission plane.

4. The light control device according to claim 1, wherein said diffuser structure comprises a plurality of diffractive elements embedded inside said transparent substrate between said light incidence plane and said light emission plane.

5. The light control device according to claim 1, further comprising at least a polarization layer configured along the path of the light from said light source unit.

6. The light control device according to claim 1, further comprising at least an anti-reflection layer configured along the path of the light from said light source unit.

7. The light control device according to claim 1, wherein said spatial distribution characterized by the degree of haze covers 1˜

99% of the surface area of said light incidence plane.

8. The light control device according to claim 1, wherein said spatial distribution characterized by the degree of haze has a haze variation range between 3˜

95%.

9. The light control device according to claim 1, wherein said spatial intensity distribution is formed by the light from said light source unit on said light incidence plane.

10. The light control device according to claim 1, wherein said spatial intensity distribution is formed by the light from said light source unit on said diffuser structure.

11. The light control device according to claim 1, wherein said diffuser structure is dispersed with a plurality of additives providing at least one of the following color mixing functions:

absorption, scattering, and absorption and reemission.

12. The light control device according to claim 11, wherein said plurality of additives are selected from at least one of the following types of color mixing elements:

dyes, pigments, nano/micro particles, phosphors, and fluorescent materials.

13. The light control device according to claim 11, wherein the spatial distribution of said additives across said diffuser structure corresponds to a spatial spectral distribution over an appropriate range of wavelength of the light from said light source unit.

14. The light control device according to claim 13, wherein said spatial spectral distribution is formed by the light from said light source unit on said light incidence plane.

15. The light control device according to claim 13, wherein said spatial spectral distribution is formed by the light from said light source unit on said diffuser structure.

16. A light control device on a path of the light from a light source unit, comprising:

(a) a transparent substrate having a light incidence plane and a light emission plane; and

(b) a collimator structure comprising a plurality of microstructures;

wherein the light from said light source unit enters said transparent substrate through said light incidence plane, is focused by said plurality of microstructures into substantially collimated light beams in an appropriate viewing angle, and exits said transparent substrate through said light emission plane; and

said plurality of microstructures have a spatial distribution corresponding to a spatial intensity distribution of the light from said light source unit.

17. The light control device according to claim 16, wherein said plurality of microstructures is configured on said light emission plane.

18. The light control device according to claim 16, further comprising at least a polarization layer configured along the path of the light from said light source unit.

19. The light control device according to claim 16, further comprising at least an anti-reflection layer configured along the path of the light from said light source unit.

20. The light control device according to claim 16, wherein said spatial intensity distribution is formed by the light from said light source unit on said light incidence plane.

21. The light control device according to claim 16, wherein said spatial intensity distribution is formed by the light from said light source unit on said plurality of microstructures.

22. The light control device according to claim 16, wherein said plurality of microstructures are dispersed with a plurality of additives providing at least one of the following color mixing functions:

absorption, scattering, and absorption and reemission.

23. The light control device according to claim 22, wherein said plurality of additives are selected from at least one of the following types of color mixing elements:

dyes, pigments, nano/micro particles, phosphors, and fluorescent materials.

24. The light control device according to claim 22, wherein the spatial distribution of said additives across said plurality of microstructure corresponds to a spatial spectral distribution over an appropriate range of wavelength of the light from said light source unit.

25. The light control device according to claim 24, wherein said spatial spectral distribution is formed by the light from said light source unit on said light incidence plane.

26. The light control device according to claim 24, wherein said spatial spectral distribution is formed by the light from said light source unit on said collimator structure.

27. The light control device according to claim 16, wherein said spatial distribution of said plurality of microstructures is characterized by the geometric properties of said plurality of microstructures.

28. The light control device according to claim 16, wherein said spatial distribution of said plurality of microstructures is characterized by the refractive indices of said plurality of microstructures.

29. A light control device on a path of the light from a light source unit, comprising:

(a) a transparent substrate having a light incidence plane and a light emission plane; and

(b) a color mixing structure comprising a plurality of color mixing elements;

wherein the light from said light source unit enters said transparent substrate through said light incidence plane, is processed by said color mixing elements to conform to a desired spatial spectral distribution, and exits said transparent substrate through said light emission plane; and

said plurality of color mixing elements have a spatial distribution corresponding to a spatial spectral distribution over an appropriate range of wavelength of the light from said light source unit.

30. The light control device according to claim 29, wherein said plurality of color mixing elements provide at least one of the following color mixing functions:

absorption, scattering, and absorption and reemission.

31. The light control device according to claim 29, wherein said plurality of color mixing elements are selected from at least one of the following types of color mixing elements:

dyes, pigments, nano/micro particles, phosphors, and fluorescent materials.

32. The light control device according to claim 29, wherein said plurality of color mixing elements are embedded in a layer of an appropriate transparent material on said light incidence plane.

33. The light control device according to claim 29, wherein said plurality of color mixing elements are embedded in a layer of an appropriate transparent material on said light emission plane.

34. The light control device according to claim 29, wherein said plurality of color mixing elements are embedded inside said transparent substrate between said light incidence plane and said light emission plane.

35. The light control device according to claim 29, wherein said spatial spectral distribution is formed by the light from said light source unit on said light incidence plane.

36. The light control device according to claim 29, wherein said spatial spectral distribution is formed by the light from said light source unit on said color mixing structure.

37. The light control device according to claim 29, further comprising at least a polarization layer configured along the path of light from said light source unit.

38. The light control device according to claim 29, further comprising at least an anti-reflection layer configured along the path of light from said light source unit.

39. A light control device positioned on the path of the light from a light source unit comprising:

(a) a transparent substrate having a light incidence plane and a light emission plane;

(b) a diffuser structure; and

(c) a collimator structure comprising a plurality of microstructures;

wherein the light from said light source unit enters said transparent substrate through said light incidence plane, is scattered by said diffuser structure in various directions, is focused by said plurality of microstructures into substantially collimated light beams in an appropriate viewing angle, and exits said transparent substrate through said light emission plane; and

said diffuser structure has a spatial distribution characterized by the degree of haze corresponding to a first spatial intensity distribution of the light from said light source unit.

40. The light control device according to claim 39, wherein said diffuser structure is configured on said light incidence plane.

41. The light control device according to claim 39, wherein said diffuser structure is configured on said light emission plane.

42. The light control device according to claim 39, wherein said diffuser structure comprises a plurality of diffractive elements embedded inside said transparent substrate between said light incidence plane and said light emission plane.

43. The light control device according to claim 39, wherein said plurality of microstructures is configured on said light emission plane.

44. The light control device according to claim 39, further comprising at least a polarization layer configured along the path of the light from said light source unit.

45. The light control device according to claim 39, further comprising an anti-reflection layer configured along the path of the light from said light source unit.

46. The light control device according to claim 39, wherein said spatial distribution characterized by the degree of haze covers 1˜

99% of the surface area of said light incidence plane.

47. The light control device according to claim 39, wherein said spatial distribution characterized by the degree of haze has a haze variation range between 3˜

95%.

48. The light control device according to claim 39, wherein said first spatial intensity distribution is formed by the light from said light source unit on said light incidence plane.

49. The light control device according to claim 39, wherein said first spatial intensity distribution is formed by the light from said light source unit on said diffuser structure.

50. The light control device according to claim 39, wherein the geometric properties of said plurality of microstructures have a spatial distribution corresponding to a second spatial intensity distribution of the light from said light source unit.

51. The light control device according to claim 50, wherein said second spatial intensity distribution is formed by the light from said light source unit on said light incidence plane.

52. The light control device according to claim 50, wherein said second spatial intensity distribution is formed by the light from said light source unit on said plurality of microstructures.

53. The light control device according to claim 39, wherein the refractive indices of said plurality of microstructures have a spatial distribution corresponding to a second spatial intensity distribution of the light from said light source unit.

54. The light control device according to claim 53, wherein said second spatial intensity distribution is formed by the light from said light source unit on said light incidence plane.

55. The light control device according to claim 53, wherein said second spatial intensity distribution is formed by the light from said light source unit on said plurality of microstructures.

56. The light control device according to claim 39, wherein said diffuser structure is dispersed with a plurality of additives providing at least one of the following color mixing functions:

absorption, scattering, and absorption and reemission.

57. The light control device according to claim 56, wherein said plurality of additives are selected from at least one of the following types of color mixing elements:

dyes, pigments, nano/micro particles, phosphors, and fluorescent materials.

58. The light control device according to claim 56, wherein the distribution of said plurality of additives across said diffuser structure corresponds to a spatial spectral distribution over an appropriate range of wavelength of the light from said light source unit.

59. The light control device according to claim 58, wherein said spatial spectral distribution is formed by the light from said light source unit on said light incidence plane.

60. The light control device according to claim 58, wherein said spatial spectral distribution is formed by the light from said light source unit on said diffuser structure.

61. The light control device according to claim 39, wherein said plurality of microstructures are dispersed with a plurality of additives providing at least one of the following color mixing functions:

absorption, scattering, and absorption and reemission.

62. The light control device according to claim 61, wherein said plurality of additives are selected from at least one of the following types of color mixing elements:

dyes, pigments, nano/micro particles, phosphors, and fluorescent materials.

63. The light control device according to claim 61, wherein the distribution of said plurality of additives across said collimator structure corresponds to a spatial spectral distribution over an appropriate range of wavelength of the light from said light source unit.

64. The light control device according to claim 63, wherein said spatial spectral distribution is formed by the light from said light source unit on said light incidence plane.

65. The light control device according to claim 63, wherein said spatial spectral distribution is formed by the light from said light source unit on said collimator structure.