Brightness enhancement film
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United States of America Patent
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Jul 6, 2004
Issued Date -
N/A
app pub date -
Jul 25, 2000
filing date -
Feb 29, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
An optical film is provided which comprises a disperse phase of polymeric particles disposed within a continuous birefringent matrix in combination with light directing materials to enable control of light emitted from a lighting fixture or display. The film is oriented, typically by stretching, in one or more directions. The size and shape of the disperse phase particles, the volume fraction of the disperse phase, the film thickness, and the amount of orientation are chosen to attain a desired degree of diffuse reflection and total transmission of electromagnetic radiation of a desired wavelength in the resulting film, and the light directing materials are chosen to control the direction of polarized light reflected from or transmitted by the optical film.
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