Illumination – Light fiber – rod – or pipe – Illuminating or display apparatus
Reexamination Certificate
2005-08-27
2010-10-19
Payne, Sharon E (Department: 2875)
Illumination
Light fiber, rod, or pipe
Illuminating or display apparatus
C362S561000, C362S624000
Reexamination Certificate
active
07815355
ABSTRACT:
Direct-lit backlights and associated methods and components are disclosed in which a transflector that partially transmits and partially reflects incident light is shaped to form at least one concave structure facing a back reflector of the backlight. This provides at least one recycling cavity therebetween, the at least one recycling cavity substantially filling the output area of the backlight. At least one light source is disposed behind the output area to inject light into each cavity, and can be positioned in the recycling cavity or behind an aperture in the back reflector. The cavities are preferably shallow and wide, having a width-to-depth ratio of at least 5 or 10, and can provide uniform brightness and color at the output area with sparsely distributed light sources and in a thin profile backlight.
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U.S. Application entitled “Direct Lit Backlight with Light Recycling and Source Polarizers”, filed on Feb. 24, 2005, having U.S. Appl. No. 11/064,685.
U.S. Application entitled “Method of Forming Direct-lit Backlights having Light Recycling Cavity with Concave Transflector”, filed on Aug. 27, 2005, having U.S. Appl. No. 60/711,523.
U
Kienitz Scott J.
Ostlie Brian W.
Schardt Craig R.
Thompson David Scott
Wheatley John A.
3M Innovative Properties Company
Payne Sharon E
Pralle Jay R.
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