The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2001
Filed:
Sep. 22, 1999
Applicant:
Inventors:
Arndt Wagner, Leonberg, DE;
Gunther Haas, Leonberg, DE;
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/10 ; F21V 8/00 ; G02F 1/1335 ;
U.S. Cl.
CPC ...
G02B 6/10 ; F21V 8/00 ; G02F 1/1335 ;
Abstract
A backlighting unit for planar and homogeneous illumination has a cold-cathode fluorescent lamp that is mounted one narrow side of a waveguide plate. The light emitted from the backlighting unit is emitted from one of the two large surfaces of the waveguide plate. The light is deflected from one narrow side to one large surface by prisms which are also mounted on one large surface. To homogenize the emitted light, the prisms are arranged in irregular fashion. Homogenization is advantageous in particular if an L-shaped or U-shaped lamp, which illuminates several narrow sides of the waveguide plate, is used as the lamp.