Backlighting device

Details Backlighting device Backlighting device

1994-02-01

1996-05-28

Lazarus, Ira S.

Illumination

Revolving

362 26, 362330, 385129, 385901, F21V 800

Patent

active

055217974

ABSTRACT:
A backlighting device for use with display panels has a plurality of light diffusing elements formed in dots or stripes on one of the two major faces of a light conducting plate that is made of a light-transmissive material. The device also has a linear light source provided in proximity to the end portion of at least one side of the light conducting plate. In the device, at least one sheet that is made of a light-transmissive material and which has a multiple of prisms or raised structures having straight ridgelines defined by the apices and minima of the raised structures at small intervals on the same side of the sheet. The sheet is arranged in such a manner that the ridgelines are substantially parallel to one another and is located on an exit face of the light conducting plate in such a way that the straight ridgelines intersect that sides of the major face of the light conducting plate or intersect imaginary lines or stripes that would be drawn when the light diffusing elements are formed on the light conducting plate.

REFERENCES:
patent: 4673254 (1987-06-01), Kato et al.
patent: 4924356 (1990-05-01), French et al.
patent: 5134549 (1992-07-01), Yokoyama
IBM Technical Disclosure Bulletin, "Backlighting for Liquid Crystal Display", Apr. 1987, pp. 4838-4839, class/subcl. 359/49.
Patent Abstracts of Japan, vol. 15, No. 262 (P-1222), Mar. 7, 1991 (JP-A-03 085 586, Oct. 4, 1991).
Patent Abstracts of Japan, vol. 13, No. 324 (P-903), Jul. 21, 1989 (JP-A-01092701, Apr. 12, 1989).
Patent Abstracts of Japan, vol. 15, No. 119 (P-1183), Mar. 22, 1991 (JP-A-3009306, Jan. 17, 1991).

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