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Display apparatus having collimated illumination

  • US 20060227259A1
  • Filed: 04/08/2005
  • Published: 10/12/2006
  • Est. Priority Date: 04/08/2005
  • Status: Active Grant
First Claim
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1. A display apparatus comprising:

  • (a) an LC device exhibiting its maximum contrast with incident light at an oblique angle φ

    from normal, wherein oblique angle φ

    is greater than about +/−

    10 degrees from normal; and

    , (b) a backlight unit providing substantially collimated illumination with a central ray at an incident angle θ

    2 with respect to the LC device, wherein incident angle θ

    2 is within about +/−

    5 degrees of oblique angle φ and

    wherein the full-width half-maximum intensity of the illumination is within about +/−

    10 degrees of the central ray at incident angle θ

    2.

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