Multi-clad black display panel

• US 6,487,350 B1
• Filed: 06/18/1999
• Issued: 11/26/2002
• Est. Priority Date: 07/16/1998
• Status: Expired due to Fees

• Current Assignee: Brookhaven Science Associates, LLC (Government of the United States of America)
• Original Assignee: Brookhaven Science Associates, LLC (Government of the United States of America)
• Inventors: Veligdan, James T., Biscardi, Cyrus, Brewster, Calvin
• Primary Examiner(s): Sanghavi, Hemang
• Application Number:
  US09/335,660
• Time in Patent Office: 1,257 Days
• Field of Search: 385/116-120, 385/901, 385/131, 362/551, 362/554, 348/804
• US Class Current: 385/120
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate
• CPC Class Codes: Y10S 385/901 Illuminating or display apparatus

Abstract

A multi-clad black display panel, and a method of making a multi-clad black display panel, are disclosed, wherein a plurality of waveguides, each of which includes a light-transmissive core placed between an opposing pair of transparent cladding layers and a black layer disposed between transparent cladding layers, are stacked together and sawed at an angle to produce a wedge-shaped optical panel having an inlet face and an outlet face.

Claims

1. An optical display panel for displaying a projected image, said optical display panel comprising:

a plurality of stacked planar optical waveguides, wherein each waveguide has a receiving end and an outlet end, which plurality of receiving ends form an inlet face and which plurality of outlet ends form an outlet face, wherein each waveguide receives image light at the inlet face, and outlets the image light at the outlet face, wherein each waveguide is formed of a core between an opposing pair of cladding layers, and wherein each of said cladding layers extends from the inlet face to the outlet face; and

a black layer disposed between adjoining cladding layers, wherein each of said black layers extends from the inlet face to the outlet face.

2. The optical display panel of claim 1, wherein the image light is displayed at the outlet face as a video image.

3. The optical display panel of claim 1, wherein the image light is displayed at the outlet face as an illuminated button.

4. The optical display panel of claim 1, wherein said plurality of waveguides are stacked at an angle, thereby disposing the outlet face obliquely with the inlet face.

5. The optical display panel of claim 4, wherein the outlet face is disposed perpendicularly to the inlet face, thereby forming the panel into a triangular wedge shape.

6. The optical display panel of claim 5, wherein the triangular wedge has an angle in the range of about 1 to 10 degrees.

7. The optical display panel of claim 6, wherein the triangular wedge has an angle in the range of about 5 degrees.

8. The optical display panel of claim 1, further comprising a light generator which generates the image light.

9. The optical display panel of claim 8, wherein said light generator includes:

a light source;

a light modulator; and

imaging optics.

10. The optical display panel of claim 9, wherein said light source is chosen from the group consisting of an incandescent bulb, a laser, an LED, and an arc lamp.

11. The optical display panel of claim 9, wherein the image light from said light source is modulated by said light modulator to define pixels.

12. The optical display panel of claim 11, wherein horizontal resolution at the outlet face is controlled by modulation of the image light from said light source.

13. The optical display panel of claim 11, wherein said light modulator is chosen from the group consisting of a liquid crystal display, a digital micromirror device, a vector scanner, a raster scanner, an FED, and a CRT.

14. The optical display panel of claim 9, wherein said imaging optics include at least one light folding mirror and at least one lens.

15. The optical display panel of claim 9, wherein said imaging optics are optically aligned between the inlet face and said light modulator for compressing, expanding, and focusing the light to fit the inlet face.

16. The optical display panel of claim 1, wherein said black layer is disposed at an angle in order to absorb ambient light.

17. The optical display panel of claim 16, wherein each of said black layers is exposed at the opposed end which outlets the image light.

18. The optical display panel of claim 1, wherein each of said waveguides is bi-directional.

19. The optical display panel of claim 1, wherein the core is laminated between the cladding layers.

20. The optical display panel of claim 1, wherein said core has a first index of refraction and wherein said cladding layer has a second index of refraction which is lower than the first index of refraction.

21. The optical display panel of claim 1, wherein said core is transparent.

22. The optical display panel of claim 21, wherein each of said cladding layers is transparent.

23. The optical display panel of claim 1, wherein said outlet face is frosted.

24. The optical display panel of claim 1, wherein each of said cores is a glass sheet.

25. The optical display panel of claim 24, wherein the glass sheet is about 0.004″

in thickness.

26. The optical display panel of claim 24, wherein the glass sheet is of type BK-7.

27. The optical display panel of claim 1, wherein each of said cores is a plastic laminate.

28. The optical display panel of claim 27, wherein the plastic laminate is Lexan®

.

29. The optical display panel of claim 1, wherein each of said cores is plexiglass.

30. The optical display panel of claim 1, wherein each of said cladding layers is a clear coat.

31. The optical display panel of claim 1, wherein each of said cladding layers is formed of polyurethane.

32. The optical display panel of claim 1, wherein each of said cladding layers is a polymethylmethacrylate sheet.

33. The optical display panel of claim 1, wherein each of said black layers is a plastic laminate.

34. The optical display panel of claim 33, wherein the plastic laminate is bonded between adjoining cladding layers.

35. The optical display panel of claim 1, further comprising at least one light redirection element connected at the outlet face.

36. The optical display panel of claim 35, wherein said light redirection element is chosen from the group consisting of a holographic coating, a series of lenses, a series of mirrors, a series of micro-lenses, a plurality of serrations, and a Fresnel prism.

37. The optical display panel of claim 1, wherein each waveguide extends horizontally, and the plurality of stacked waveguides extends vertically.

38. The optical display panel of claim 37, wherein the panel has a width along a horizontal of the outlet face, a height along a vertical of the outlet face, a top, and a bottom along the inlet face, which bottom has a depth from the outlet face to the back face.

39. The optical display panel of claim 38, wherein the width to the height is an aspect ratio of 4:

3.

40. The optical display panel of claim 38, wherein the width to the height is an aspect ratio of 16:

9.

41. The optical display panel of claim 38, wherein the depth of the bottom is in the range of about 5.0 to 8.0 cm, and wherein the height of the panel is 100 cm and the width of the panel is 133 cm.