Tiled, flat-panel display having invisible seams

• US 5,661,531 A
• Filed: 01/29/1996
• Issued: 08/26/1997
• Est. Priority Date: 01/29/1996
• Status: Expired due to Term

• Current Assignee: TransPacific Exchange, LLC
• Original Assignee: Rainbow Displays, Inc.
• Inventors: Greene, Ray G., Seraphim, Donald P., Katyl, Robert H., Yost, Boris, Li, Che-yu, Krusius, J. Peter
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Dudek, James A.
• Application Number:
  US08/593,759
• Time in Patent Office: 575 Days
• Field of Search: 359/40, 359/41, 359/36, 359/82, 359/83, 359/80, 359/67, 359/53, 349/73, 349/37, 349/122, 349/143, 349/158
• US Class Current: 349/73
• CPC Class Codes: G02F 1/13336 Combining plural substrates to produce large-area displays, e.g. tiled displays
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

The present invention features a tiled, substantially flat, panel display having the characteristic of visually imperceptible seams between the tiles for the intended viewing conditions, which include the perception thresholds of the human eye, the view distance, the display brightness and the level of the ambient light. The panel consists of an image source plane having spaced-apart pixels containing light-transmitting elements comprising single or multiple lightvalves. These lightvalves transmit monochromatic light, or primary color light spectra, for example, red, green and blue, in gray-scale and color displays, respectively. Each of the pixels is located along the image source plane at a uniform pitch greater than approximately 0.2 mm. Many adjacently-situated tiles are located in a plane in proximity to the image source plane. Secondary light rays can be controlled via light shields, aperture plates, masks and optical elements. The view angles of the tiled display may be further enhanced by using dispersive, optical elements such as microlens arrays. If desired, the brightness of the tiled display can be enhanced by increasing the backlight intensity or the collection of light by using optical, focusing elements such as microlens arrays.

Claims

1. A tiled, substantially flat, panel display composed of a plurality of joined, smaller tiles, having the characteristic of visually imperceptible seams between tiles disposed in an interior portion thereof, such that said panel display can be viewed as though it were a single, monolithic display, comprising:

a) means defining an image source plane having spaced-apart, pixel-active areas, with each of said pixel-active areas being disposed along said image source plane at a given pitch distance;

b) a plurality of adjacently disposed tiles, each having a predetermined thickness, disposed in a plane adjacent said image source plane;

c) means defining seams disposed between adjacent tiles;

d) masking means in conjunction with light collimating means, said masking means being proximate said seams for blocking direct and selectively scattered light from said seams towards a viewer of said display, thereby rendering said seams substantially visually imperceptible to said viewer, notwithstanding any angle at which said display is viewed thereby; and

e) means defining a viewing plane adjacent said masking means for transmitting light from said image source plane to said viewer, with substantially no light from said seams.

2. The tiled, substantially flat, panel display in accordance with claim 1, wherein said tiles comprise an upper and a lower layer each having a predetermined thickness, and said distance from said image source plane to said viewing plane is between approximately the geometrical mean of said thicknesses of said layers and one order of magnitude greater than said given distance of said spaced-apart pixel-active areas.

3. The tiled, substantially flat, panel display in accordance with claim 1, wherein said viewing plane comprises a lens layer.

4. The tiled, substantially flat, panel display in accordance with claim 1, wherein said viewing plane comprises a screen layer.

5. The tiled, substantially flat, panel display in accordance with claim 1, further comprising a color filter layer.

6. The tiled, substantially flat, panel display in accordance with claim 1, wherein each of said pixel-active areas comprises a group of primary color elements.

7. The tiled, substantially flat, panel display in accordance with claim 1, wherein said image source plane comprises a substantially non-diverging, light-intensity distribution characteristic.

8. The tiled, substantially flat, panel display in accordance with claim 1, further comprising at least two polarizing layers, one of said polarizing layers being disposed between said image source plane and the viewing plane.

9. The tiled, substantially flat, panel display in accordance with claim 2, wherein said pitch distance of pixel-active areas is greater than approximately 0.2 mm.

10. The tiled, substantially flat, panel display in accordance with claim 2, wherein said distance from said image source plane to said viewing plans is less than approximately five times said tile thickness.

11. The tiled, substantially flat, display panel in accordance with claim 1, wherein said masking means comprises light-shielding material disposed in said image source plane.

12. The tiled, substantially flat, display panel in accordance with claim 1, wherein said masking means comprises light-shielding material disposed above said image source plane.

13. The tiled, substantially flat, display panel in accordance with claim 1, wherein said masking means comprises light-shielding material disposed below said image source plane, so that additional light collimation is provided along predetermined channels.

14. The tiled, substantially flat, display panel in accordance with claim 1, wherein said masking means comprises light-shielding material disposed within said seams.

15. The tiled, substantially flat, panel display in accordance with claim 1, further comprising:

f) a compound disposed in said seams, having optical properties that are substantially similar to the optical properties of said tiles.

16. The tiled, substantially flat, panel display in a accordance with claim 1, further comprising:

f) a plurality of light-directing means disposed proximate at least one of said planes for eliminating superfluous secondary light paths from said viewing plane.

17. The tiled, substantially flat, panel display in accordance with claim 1, further comprising:

f) a base plate for supporting said planes, said tiles and said masking means, and for providing an electrical, optical and mechanical interface.

18. The tiled, substantially flat, panel display in accordance with claim 17, further comprising:

g) a tile carrier for supporting said tiles.

19. The tiled, substantially flat, panel display in accordance with claim 18, further comprising:

h) a plurality of focusing devices for coupling light into said image source plane.

20. The tiled, substantially flat, panel display in accordance with claim 19, wherein said plurality of focusing devices comprises any one of the group comprising refractive microlenses, off-axis lenses and holographic lens devices.

21. The tiled, substantially flat, panel display in accordance with claim 13, further comprising

f) a plurality of focusing devices for coupling light in said predetermined collimating channels.

22. The tiled, substantially flat, panel display in accordance with claim 19, wherein said plurality of focusing devices is integrated into said substantially flat, panel display.

23. The tiled, substantially flat, panel display in accordance with claim 1, wherein said masking means and said viewing plane comprise a single, integrated structure.

24. The tiled, substantially flat, panel display in accordance with claim 1, further comprising an anti-reflective coating.

25. The tiled, substantially flat, panel display in accordance with claim 1, wherein at least one of said pixel-active areas is dimensionally non-identical to the others of said pixel-active areas.

26. A tiled, substantially flat, panel display composed of a plurality of joined, smaller tiles, having the characteristic of a visually imperceptible seam, such that said panel display can be viewed as though it were a single, monolithic display, comprising:

a) means defining an image source plane having spaced-apart, pixel-active areas;

b) a plurality of tiles disposed in a plane adjacent said image source plane;

c) means defining a seam disposed between adjacently disposed tiles;

d) masking means in conjunction with light collimating means, said masking means being disposed proximate said seam for blocking direct and selectively scattered light directed from said seam towards a viewer of said display, thereby making said seam substantially visually imperceptible to said viewer, notwithstanding any angle at which said display is viewed thereby; and

e) means defining a viewing plane comprising a light-transmitting layer disposed adjacent said masking means.

27. The tiled, substantially flat, panel display in accordance with claim 26, further comprising a color filter layer.

28. The tiled, substantially flat, display panel in accordance with claim 26, wherein said masking means comprises light-shielding material disposed in said image source plane for providing additional light collimation along predetermined channels.

29. The tiled, substantially flat, panel display in accordance with claim 26, further comprising:

f) a compound disposed in said seam having optical properties that are substantially similar to the optical properties of said tiles.

30. The tiled, substantially flat, panel display in accordance with claim 29, further comprising:

g) a plurality of focusing devices for coupling light into said image source plane.

31. A tiled, substantially, flat panel composed of a plurality of joined, smaller tiles, display having the characteristic of visually imperceptible seams between tiles disposed in an interior portion thereof, such that said panel display can be viewed as though it were a single, monolithic display, comprising:

a) means defining an image source plane having spaced-apart, pixel-active areas, with each of said pixel-active areas being disposed along said image source plane at a given pitch distance;

b) a plurality of adjacently disposed tiles, each having a predetermined thickness, disposed in a plane adjacent said image source plane;

c) means defining seams disposed between adjacent tiles;

d) a compound disposed in said seams, having optical properties that are substantially similar to the optical properties of said tiles, whereby light passing through said seams is substantially less refracted and/or scattered than in the absence of said compound; and

e) means defining a viewing plane for transmitting light from said image source plane to said viewer, with substantially no light from said seams.

32. The tiled, substantially flat, panel display in accordance with claim 31, wherein distance from said image source plane to said viewing plane is within one order of magnitude of said given pitch distance of said spaced-apart, pixel-active areas.

33. The tiled, substantially flat, panel display in accordance with claim 31, wherein said viewing plane comprises a lens layer.

34. The tiled, substantially flat, panel display in accordance with claim 31, wherein said viewing plane comprises a screen layer.

35. The tiled, substantially flat, panel display in accordance with claim 31, further comprising a color filter layer.

36. The tiled, substantially flat, panel display in accordance with claim 31, wherein each of said pixel-active areas comprises a group of primary color elements.

37. The tiled, substantially flat, panel display in accordance with claim 31, wherein said image source plane comprises a substantially non-diverging, light-intensity distribution characteristic.

38. The tiled, substantially flat, panel display in accordance with claim 31, further comprising at least two polarizing layers, one of said polarizing layers being disposed between said image source plane and said viewing plane.

39. The tiled, substantially flat, panel display in accordance with claim 32, wherein said pitch distance of pixel-active areas is greater than approximately 0.2 mm.

40. The tiled, substantially flat, panel display in accordance with claim 32, wherein said distance from said image source plane to said viewing layer is less than approximately five times the thickness of said tiles.

41. The tiled, substantially flat, panel display in accordance with claim 31, further comprising:

f) a compound disposed in said seams having optical properties that are substantially similar to the optical properties of said tiles.

42. A tiled, substantially flat, panel display in a accordance with claim 31, further comprising:

f) a plurality of light-directing means disposed proximate at least one of said planes for eliminating superfluous secondary light paths from said viewing plane.

43. The tiled, substantially flat, panel display in accordance with claim 31, further comprising:

f) a base plate for supporting said planes, said tiles and said masking means, and for providing an electrical, optical and mechanical interface.

44. The tiled, substantially flat, panel display in accordance with claim 43, further comprising:

g) a tile carrier for supporting said tiles.

45. The tiled, substantially flat, panel display in accordance with claim 31, further comprising:

h) a plurality of focusing devices for coupling light into said image source plane.

46. The tiled, substantially flat, panel display in accordance with claim 31, wherein said plurality of focusing devices comprises any one of the group comprising refractive microlenses, off-axis lenses and holographic lens devices.

47. The tiled, substantially flat, panel display in accordance with claim 31, further comprising:

f) a plurality of focusing devices for coupling light in said predetermined collimating channels.

48. The tiled, substantially flat, panel display in accordance with claim 45, wherein said plurality of focusing devices is integrated into said substantially flat, panel display.

49. The tiled, substantially flat, panel display in accordance with claim 31, further comprising an anti-reflective coating.

50. The tiled, substantially flat, panel display in accordance with claim 31, wherein at least one of said pixel-active areas is dimensionally non-identical to the others of said pixel-active areas.