Low cost optical film stack

  • US 9,720,278 B2
  • Filed: 01/21/2016
  • Issued: 08/01/2017
  • Est. Priority Date: 01/22/2015
  • Status: Active Grant
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First Claim
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1. A backlight assembly for a display having a polarized transmission axis comprising:

  • a light source for emitting light;

    a first brightness enhancement film having a plurality of prismatic elements extending in a first direction, and positioned to receive light emitted from the light source;

    a second brightness enhancement film having a plurality of prismatic elements extending in a second direction; and

    a diffuser positioned to receive light exiting the first brightness enhancement film, wherein light exiting the diffuser enters the second brightness enhancement film.

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