Backlighting device
First Claim
1. A backlighting device for use with display panels comprising:
- a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with one of a specular and light diffusing/reflecting plate;
a linear light source provided in proximity to at least one end portion of said light conducting plate; and
directivity enhancing means provided on an exit face of the light conducting plate for enhancing a directivity of light emitted from said light conducting plate in directions close to a line dropped perpendicular to said exit face, said directivity enhancing means being entirely transparent and comprising at least one sheet that has a plurality of raised structures having straight ridgelines formed at minute intervals on a same side of said at least one sheet in such a manner that the straight ridgelines are substantially parallel to one another and said raised structures extend outward in a direction of light transmission, a distance between vertices of adjacent ones of said ridgelines being in a range of 10-1000 μ
m.
1 Assignment
0 Petitions
Accused Products
Abstract
In a backlighting device for use with display panels that comprises a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with a specular or light diffusing/reflecting plate, and a linear light source provided in proximity to the end portion of at least one side of said light conducting plate, the improvement wherein at least one sheet that is made of a light-transmissive material and that has a multiple of raised structures having straight ridgelines at minute intervals on the same side in such a manner that the ridgelines are substantially parallel to one another or at least one sheet that is made of a light-transmissive material and that has a multiple of pyramidal or conical projecting structures at minute intervals on the same side, said projecting structures having portions of such a shape that the vertical angles are substantially the same, is provided on the exit face of the light conducting plate in such a way that either type of structures face outward.
-
Citations
6 Claims
-
1. A backlighting device for use with display panels comprising:
-
a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with one of a specular and light diffusing/reflecting plate; a linear light source provided in proximity to at least one end portion of said light conducting plate; and directivity enhancing means provided on an exit face of the light conducting plate for enhancing a directivity of light emitted from said light conducting plate in directions close to a line dropped perpendicular to said exit face, said directivity enhancing means being entirely transparent and comprising at least one sheet that has a plurality of raised structures having straight ridgelines formed at minute intervals on a same side of said at least one sheet in such a manner that the straight ridgelines are substantially parallel to one another and said raised structures extend outward in a direction of light transmission, a distance between vertices of adjacent ones of said ridgelines being in a range of 10-1000 μ
m. - View Dependent Claims (2, 3)
-
-
4. A backlighting device for use with display panels comprising:
-
a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with one of a specular and light diffusing/reflecting plate; a linear light source provided in proximity to at least one end portion of said light conducting plate; and directivity enhancing means provided on an exit face of the light conducting plate for enhancing a directivity of light emitted from said light conducting plate in directions close to a line dropped perpendicular to said exit face, said directivity enhancing means being entirely transparent and comprising at least one sheet that has a plurality of one of pyramidal and conical projecting structures formed at minute intervals on a same side of said at least one sheet, said projecting structures having portions shaped such that angles formed by said structures with respect to a line perpendicular to said exit face are substantially the same, said projecting structures extending outward in a direction of light transmission, a distance between vertices of adjacent ones of said projecting structures being in a range of 10-1000 μ
m. - View Dependent Claims (5, 6)
-
Specification