Ultra-thin backlight
First Claim
1. A backlight for a display device comprising:
- A light guiding plate having at least a front and a back surface said front surface being disposed proximate to said display device;
a light source couple to an edge portion of said light guiding plate;
a light extraction means disposed along at least one of said front or said back surfaces of said light guiding plate; and
a reflector disposed behind at least said back surface.
1 Assignment
0 Petitions
Accused Products
Abstract
A backlight for a display device, such as a liquid crystal display device, includes a light guiding plate having a front and a rear surface. The front and rear surfaces may be parallel to one another, or may instead be non-parallel. To the extent that such surfaces are non-parallel, one surface may be inclined at a single, or multiple angles with respect to the other surface. The backlight further includes a light source that is coupled to an edge of the light guiding plate by means of an energy conserving coupling section, and which provides light that is conditioned and transmitted through the light guiding plate. Light extractors are disposed on at least one side of the light guiding plate to assist in the transmission and conditioning of the light that is provided to the light guiding plate by the light source. A reflector may also be provided to assure that all light flux directed into the light guiding plate is ultimately directed in the direction of the display device.
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Citations
58 Claims
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1. A backlight for a display device comprising:
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A light guiding plate having at least a front and a back surface said front surface being disposed proximate to said display device;
a light source couple to an edge portion of said light guiding plate;
a light extraction means disposed along at least one of said front or said back surfaces of said light guiding plate; and
a reflector disposed behind at least said back surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24)
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22. A backlight for a display device comprising:
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A light guiding plate having at least a first surface and a second surface, said first surface being disposed proximate to said display device, and wherein said first and second surfaces are at least partially non-parallel;
a light emitting diode couple to an edge portion of said light guiding plate;
a light extraction means disposed along at least said back surface of said light guiding plate; and
a reflector disposed behind at least said back surface. - View Dependent Claims (23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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35. A flat illumination device (FID), having at least one illumination window defined over at least one plane, comprising:
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a light guiding plate, having two mutually parallel faces, and at least one edge said illumination window being outside said light guiding plate;
at least one light source, each said light source disposed so as to couple a respective input luminous flux from the light source into a corresponding edge;
each input luminous flux forming a corresponding internal flux component which propagates through said light guiding plate by total internal reflection;
wherein at least one of said faces is a flux extracting face, which has a pattern of flux extracting elements distributed thereon covering a varying fraction of an elementary area of said flux extracting faces.
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52. A flat illumination device (FID), having at least one illumination window defined over at least one plane, comprising:
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a light guiding plate, having two faces at least one of which is non-planar and at least one edge;
at least one light source, each operative and disposed so as to couple a respective input luminous flux into any one of said edges;
each input luminous flux forming a corresponding internal flux component, which propagates through said plate mainly by internal reflection;
wherein, for any non-planar face of said plate, the normal distance from any point on the face to a given plane varies over the face so as to effect any specified distribution of luminous emittance over at least one illumination window. - View Dependent Claims (53, 54, 55, 56, 57, 58)
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Specification