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Optical compensator for improved gray scale performance in liquid crystal display

  • US 5,504,603 A
  • Filed: 04/04/1994
  • Issued: 04/02/1996
  • Est. Priority Date: 04/04/1994
  • Status: Expired due to Term
First Claim
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1. A liquid crystal display for viewing at various angles with respect to a normal axis perpendicular to the display, comprising:

  • a polarizer layer having an absorbing axis;

    an analyzer layer having an absorbing axis substantially perpendicular to the absorbing axis of the polarizer layer;

    a liquid crystal layer disposed between the polarizer layer and the analyzer layer and having a director exhibiting an azimuthal twist through the layer with respect to the normal axis;

    a first electrode proximate to a first major surface of the liquid crystal layer;

    a second electrode proximate to a second major surface of the liquid crystal layer, the first and second electrodes being adapted to apply a voltage across the liquid crystal layer when the electrodes are connected to a source of electrical potential; and

    a compensator, including a positively birefringent O-plate compensator layer disposed between the polarizer layer and the analyzer layer with its principal symmetry axis oriented at a substantially oblique angle of between 25 and 65 degrees with respect to the normal axis.

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