Direct-lit backlight having light recycling cavity with concave transflector

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United States of America Patent

PATENT NO 9857518
SERIAL NO

12905937

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Abstract

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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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Patent Owner(s)

  • 3M INNOVATIVE PROPERTIES COMPANY

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kienitz, Scott J Woodbury, US 3 145
Ostlie, Brian W Hudson, US 23 449
Schardt, Craig R St. Paul, US 74 1633
Thompson, David Scott Woodbury, US 52 818
Wheatley, John A Lake Elmo, US 242 9403

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