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Optical sheet, and backlight unit and display using the same

  • US 20070236940A1
  • Filed: 06/06/2007
  • Published: 10/11/2007
  • Est. Priority Date: 01/31/2005
  • Status: Active Grant
First Claim
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1. An optical sheet which is used for light control illumination in a backlight unit for a display, comprising:

  • light reflection parts at non-light condensing areas by the lens unit; and

    light transmission parts at areas other than the light reflection parts, respectively on a surface of a lenticular sheet having a lens unit which is formed by forming a convex cylindrical lens group in parallel, and a surface at a side opposite to the lens unit, wherein among a distance TB from a valley portion of concavity and convexity structuring the lens unit to the surface at the opposite side, a width A of the light transmission parts, a pitch P between the parallel convex cylindrical lenses, and a critical angle α

    at an interface with the lenticular sheet at the light transmission parts, a relation of P≦

    A+2*TB*tanα

    is formed.

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