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Title:
BACKLIGHT WITH STRUCTURED SUFACES
Document Type and Number:
WIPO Patent Application WO2002004858
Kind Code:
A3
Abstract:
A backlight includes a lightguide (16), a light source (12) disposed with respect to the lightguide (16) to introduce light into the lightguide (16) and a turning film. Optical structures (40) are formed in one of an output surface (18) and a back surface (20) of the lightguide (16). The optical structures (40) are arranged to extract light from the lightguide (16). A back reflector (24) is disposed adjacent the back surface (20). The optical structures (40) are formed to include a varying pattern arranged to mask non-uniformities in the output of the lightguide (16).

Inventors:
GARDINER MARK E
COBB SANDFORD
KRETMAN WADE D
Application Number:
PCT/US2001/021294
Publication Date:
May 23, 2002
Filing Date:
July 05, 2001
Export Citation:
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Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
G02B6/00; F21V8/00; G02F1/13357; F21Y103/00; (IPC1-7): F21V8/00
Domestic Patent References:
WO2001027527A12001-04-19
Foreign References:
EP0426411A21991-05-08
US5997148A1999-12-07
US5921651A1999-07-13
US5775791A1998-07-07
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 10 31 October 1997 (1997-10-31)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 10 31 March 1999 (1999-03-31)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 14 22 December 1999 (1999-12-22)
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 09 31 October 1995 (1995-10-31)
See also references of EP 1301743A2
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