Ultra-thin backlight
First Claim
1. A backlight for a display device comprising:
- a light guiding plate having at least one edge and a front major surface and a back major surface said front major surface being disposed proximate to said display device, and wherein said back major surface of said light guiding plate forms a doubly curved wedge light guiding plate;
at least one light source coupled to said edge 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 major 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 included 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.
-
Citations
40 Claims
-
1. A backlight for a display device comprising:
-
a light guiding plate having at least one edge and a front major surface and a back major surface said front major surface being disposed proximate to said display device, and wherein said back major surface of said light guiding plate forms a doubly curved wedge light guiding plate; at least one light source coupled to said edge 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 major surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 40)
-
-
20. A backlight for a display device comprising:
-
a light guiding plate having at least one edge, a first major surface and a second major surface, said first major surface being disposed proximate to said display device, and wherein said second major surface of said light guiding plate forms a doubly curved wedge light guiding plate; at least one light emitting diode coupled to an edge portion of said light guiding plate; a light extraction means disposed along at least said second major surface of said light guiding plate; and a reflector disposed behind at least said second major surface. - View Dependent Claims (21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. A flat illumination device (FID), having at least one illumination window defined over at least one plane, comprising:
-
a light guiding plate, having two major faces at least one of which is planar and one of which is non-planar and at least two edges, and wherein one of said major surfaces of said light guiding plate forms a doubly curved wedge light guiding plate; 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 by internal reflection; wherein, for any non-planar face of said plate, the distance from any point on the face to said second major face varies over the face as a function of a distance from said point to at least two edges of said plate, so as to effect any specified distribution of luminous emittance over at least one illumination window. - View Dependent Claims (34, 35, 36, 37, 38, 39)
-
Specification