Display

• US 20040239823A1
• Filed: 07/09/2004
• Published: 12/02/2004
• Est. Priority Date: 08/13/2001
• Status: Abandoned Application

• Current Assignee: Inputpearl Limited
• Original Assignee: Inputpearl Limited
• Inventors: Aston, Mark, Silsby, Paul Alistair
• Application Number:
  US10/486,643
• Publication Number:
  US 20040239823A1
• Time in Patent Office: Days
• US Class Current: 349/40
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers

Abstract

The technique of the present invention improves the viewability of a large display screen by using an antiglare screen arranged over a plurality of pixels. The anti-glare consists of a plurality of anti-glare elements (17) which have a surface facing the position from which the display is viewable (18). Each anti-glare element surface (18) is of substantially parabolic shape in order to effectively disperse light that is incident on the display screen.

Claims

1-45. -45. (Canceled).

46. A display screen comprising a plurality of pixels arranged in rows and an anti-glare screen arranged over the pixels comprising anti-glare elements having a surface facing a position from which the display screen is viewable, which surface is curved to disperse light incident on the screen, wherein said anti-glare elements are arranged line-by-line over said rows of pixels.

47. A display screen as claimed in claim 46, wherein the curved surface of each element has a length of similar dimensions to a pixel of the screen, with anti-glare elements being provided over each pixel.

48. A display screen as claimed in claim 46, wherein the surfaces of the anti-glare elements are concave.

49. A display screen as claimed in claim 46, wherein the surfaces of the anti-glare elements are convex.

50. A display screen as claimed in claim 46, wherein the surfaces of the anti-glare elements have the shape of a section of the circumference of a conic section.

51. A display screen as claimed in claim 50, wherein the surfaces of the anti-glare elements have a substantially parabolic shape.

52. A display screen as claimed in claim 50, wherein the surfaces of the anti-glare elements have the shape of a section of the circumference of an ellipse.

53. A display screen as claimed in claim 46, wherein each pixel is square and has an area of between 49 mm² and 2500 mm².

54. A display screen as claimed in claim 46, wherein the screen has a total area of 3 m² to 120 m².

55. A display screen as claimed in claim 46 further comprising a plurality of pixel modules arranged such that the mutual spacing between said pixels is substantially constant so as to give a substantially seamless image.

56. A display screen comprising a plurality of pixels, wherein the pixels comprise liquid crystal elements divided into segments and the brightness of light passing through a respective pixel can be varied by controlling the number of segments of liquid crystal that are substantially transparent or substantially opaque.

57. A display screen as claimed in claim 56, comprising means of varying the relative proportions of time for which said segments are substantially transparent and substantially opaque respectively.

58. A display screen as claimed in claim 56, wherein the liquid crystal elements are Helmeier type liquid crystal.

59. A display screen as claimed in claim 58, wherein the Helmeier liquid crystal elements comprise a linear polariser and a nematic liquid hosting a pleochroic or Azo dye.

60. A display screen as claimed in claim 56, wherein said pixels comprise segments having differing surface areas.

61. A display screen as claimed in claim 60, wherein the surface areas of the segments are related to one another by powers of 2.

62. A display screen as claimed in claim 56, wherein each pixel comprises segments arranged concentrically.

63. A display screen as claimed in claim 56, wherein each pixel comprises segments having surface areas which increase toward the periphery of each pixel.

64. A display screen according to claim 60, wherein each pixel has red, green and blue filters and the filters are provided over groups of segments of each pixel such that the brightness of each colour may be varied.

65. A display screen according to claim 56, further comprising a white light source and filters for altering the colour of light transmitted by the or each pixel, wherein the filters have a band of strongest transmission at a wavelength substantially equal to an emission peak of the light source.

66. A display screen as claimed in claim 65, wherein dye provided in the pixels is also selected to absorb strongly at emission peaks of the light source.

67. A display screen as claimed in claim 56, wherein each pixel is square and has an area of between 49 mm² and 2500 mm².

68. A display screen as claimed in claim 56, wherein the screen has a total area of 3 m² to 120 m².

69. A display screen as claimed in claim 56 further comprising a plurality of pixel modules arranged such that the mutual spacing between said pixels is substantially constant so as to give a substantially seamless image.

70. A display comprising a display screen having a plurality of pixels, said display screen being arranged to be illuminated from the rear, the illumination comprising a plurality of tubular light sources inclined along their length to the plane of the display screen.

71. A display as claimed in claim 70, wherein the angle of inclination is about 8°

.

72. A display as claimed in claim 70, wherein said white light source is a fluorescent tube having a U-shape.

73. A display as claimed in claim 70, wherein each pixel is square and has an area of between 49 mm² and 2500 mm².

74. A display as claimed in claim 70, wherein the screen has a total area of 3 m² to 120 m².

75. A display as claimed in claim 70, wherein a temperature management system supplies air to the pixels.

76. A display as claimed in claim 70 comprising a reflector having a first arc of curvature along the base from the sidewall and a second arc of curvature along the base from a position intermediate to the light sources in use.

77. A display as claimed in claim 70 comprising a plurality of pixel modules arranged such that the mutual spacing between said pixels is substantially constant so as to give a substantially seamless image.