Elongated illuminators configuration for LCD displays

• US 7,780,330 B2
• Filed: 05/16/2007
• Issued: 08/24/2010
• Est. Priority Date: 05/16/2007
• Status: Expired due to Fees

• Current Assignee: SKC Haas Display Films Co., Ltd. (Dow, Inc.)
• Original Assignee: Rohm and Haas Electronic Materials LLC (DuPont de Nemours, Inc.)
• Inventors: Bourdelais, Robert P., Palmeri, John M., Hong, Qi, Gates, Leonard S., Aylward, Peter T.
• Primary Examiner(s): TON, ANABEL
• Application Number:
  US11/749,171
• Publication Number:
  US 20080285310A1
• Time in Patent Office: 1,196 Days
• Field of Search: 362600-634
• US Class Current: 362/613
• CPC Class Codes: G02B 6/001 the light being emitted along at least a portion of the lateral surface of the fibre
• CPC Class Codes: G02B 6/002 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0078 Side-by-side arrangements, e.g. for large area displays

Abstract

A solid waveguide comprises opposite TIR surfaces further comprising:

• • a) at least one light input surface for coupling light from a solid state light source;
  • b) at least one mixing section;
  • c) at least one light emitting surface; and
  • d) a desired pattern of light redirecting features located on one TIR surface or between the TIR surfaces.

Claims

1. A solid waveguide comprising opposite TIR surfaces further comprising:

a) at least one light input surface for coupling light from a solid state light source;

b) at least one mixing section;

c) at least one light emitting surface; and

d) a desired pattern of light redirecting features located on one TIR surface or between the TIR surfaces, and further comprising at least 2 additional TIR surfaces opposite to each other.

2. The solid waveguide of claim 1 further comprising at least one elongated illuminator.

3. The solid waveguide of claim 2 wherein said light mixing section is an integral part of said elongated illuminators.

4. The solid waveguide of claim 2 wherein said light mixing section is substantially free of the desired pattern of light directing features.

5. The solid waveguide of claim 2 wherein said light mixing section provides uniform color temperature for the light extraction area for the solid waveguide.

6. The solid waveguide of claim 2 wherein said at least one light input surface comprises at least one shape selected from the group consisting of flat, tapered, convex, concave, indented, multi-surfaced, partly reflecting, TIR adjusting.

7. The solid waveguide of claim 2 wherein said indents further comprises a means of adjusting the light to a critical TIR angle within said solid light guide.

8. The solid waveguide of claim 7 wherein said a means of adjusting the light to a critical TIR angle further comprises at least one selected from the group consisting of a reflector, a scatterer, and a prism.

9. The solid waveguide of claim 2 wherein said a desired pattern of light redirecting features comprises at least one selected from the group consisting of prisms, dots, reflectors, and changing slope.

10. The solid waveguide of claim 9 wherein said changing slope is on the side opposite of said at least one light-emitting surface.

11. The solid waveguide of claim 9 wherein said changing slope comprises at least one taper starting at the light guide side of said at least one mixing section.

12. The solid waveguide of claim 11 wherein said taper terminates at least in one location selected from the group consisting of the center, the opposite side of said at least one light emitting section, the opposite end of said light guide, and a reflector.

13. The solid waveguide of claim 11 wherein said taper comprises a radius.

14. The solid waveguide of claim 11 wherein said taper includes at least two different slopes.

15. The solid waveguide of claim 2 comprising at least one elongated illuminator further comprises a bridge connecting at least two elongated illuminators.

16. The solid waveguide of claim 1 further comprising at least one region with air.

17. The solid waveguide of claim 1 further comprising at least one elongated illuminator has an end cross sectional profile selected from the group consisting of square, rectangular, triangular, round.

18. The solid waveguide of claim 1 further comprising at least one elongated illuminator further comprises a region to spread light sideways towards said at least one light-emitting surface.

19. The solid waveguide of claim 2 wherein said at least one light-emitting surface is a view side.

20. The solid waveguide of claim 19 further comprising a region toward the elongated illuminator that includes a means of redirecting light substantially towards said light emitting surface.

21. The solid waveguide of claim 20 wherein said elongated illuminator comprises a means for side light emitting.

22. The solid waveguide of claim 1 wherein said elongated illuminator an optical fiber.

23. The solid waveguide of claim 1 wherein said elongated illuminator comprises regions of controlled light leakage.

24. The solid waveguide of claim 1 wherein said elongated illuminator further comprises a TIR cladding.

25. The solid waveguide of claim 1 further comprising at least one light mixing section substantially outside of the view area of the light guide.

26. The solid waveguide of claim 1 comprising a light source.

27. The solid waveguide of claim 1 comprising PMMA.

28. The solid waveguide of claim 2 wherein said at least one elongated illuminator has a length to input surface area ratio of greater than 100/1.

29. The solid waveguide of claim 1 wherein said at least one mixing section is from 20 to 60 mm in length.

30. The solid waveguide of claim 1 has an on-axis brightness of greater than 2000 cd/m².

31. The solid waveguide of claim 1 wherein the light from a solid state light source is redirected substantially normal to said at least one light emitting surface.

32. The solid waveguide of claim 2 wherein said at least one elongated illuminator has a brightness uniformity along its length of less than 10%.

33. A solid waveguide of claim 1 wherein said opposite TIR surfaces have a surface roughness Ra of less than 50 nm.

34. The solid waveguide of claim 1 wherein said solid state light source further comprises a heat sink.

35. The solid waveguide of claim 1 wherein the desired pattern of light redirecting features varies in at least one selected from the group consisting of height, density, size, location, included angle and roughness.