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Backlighting of nematic curvilinear aligned phase liquid crystal display panels

  • US 5,283,563 A
  • Filed: 03/20/1990
  • Issued: 02/01/1994
  • Est. Priority Date: 03/20/1990
  • Status: Expired due to Fees
First Claim
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1. A backlighted liquid crystal display comprising:

  • a first liquid crystal cell and a second liquid crystal cell disposed in a substantially aligned position relative to one another, said first liquid crystal cell having a first transparent substrate coincident with a front surface of said liquid crystal display and sealed with a second transparent substrate to form a first chamber containing a first liquid crystal, and said second liquid crystal cell being integral with said second transparent substrate and containing an encapsulated second liquid crystal, said first and second liquid crystal cells each including electrodes deposited on said first and second transparent substrates and connected to a source of voltage for applying a voltage across selected portions of said first and second liquid crystals;

    switching means connecting said electrodes to said source of voltage so that when a voltage is applied across a selected portion of said first liquid crystal causing the selected portion to become transparent, voltage is prevented from being applied across a corresponding portion of said second liquid crystal so that the corresponding portion is diffusely reflecting, said switching means further preventing voltage from being applied across nonselected portions of said first liquid crystal and applying a voltage across corresponding nonselected portions of said second liquid crystal, said switching means control of said nonselected portions associated with said first liquid crystal making the nonselected portions of said second liquid crystal clear; and

    an edge lighted clear wedge in optical contact with said second liquid crystal cell, light propagated within said wedge being internally reflected except where said second liquid crystal is diffusely reflecting, whereby incident light which is transmitted through said first liquid crystal cell and reflected by said second liquid crystal is augmented by light from said edge lighted plastic wedge.

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