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Transflective mode liquid crystal display with phosphor illumination

  • US 5,146,355 A
  • Filed: 03/18/1991
  • Issued: 09/08/1992
  • Est. Priority Date: 10/23/1986
  • Status: Expired due to Fees
First Claim
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1. A transflective mode liquid crystal display comprising in combination:

  • (a) a layer of liquid crystal material;

    (b) an active planar array of transparent control electrodes on a first side of said layer of liquid crystal material for forming a corresponding array of adjacent, modulated light-conducting cells within said layer of liquid crystal material;

    (c) a planar matrix layer of discrete phosphor elements of predetermined dot pitch, said layer being located on the opposed, second side of said layer of liquid crystal material;

    (d) an ultraviolet light source located behind said second side of said layer of liquid crystal material and behind said planar matrix of discrete phosphor elements for irradiating said phosphor elements with ultraviolet light;

    (e) a dilute color filter comprising a planar matrix of light-absorbing, wide-passband dye elements, each of said dye elements being in alignment with a like color emitting one of said phosphor elements located between said phosphor layer and said layer of liquid crystal material and adjacent a transparent counterelectrode; and

    (f) the spacing between said layer of discrete phosphor elements and said planar array of transparent control electrodes does not exceed one-tenth of said dot pitch.

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