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Liquid crystal display device

  • US 20030210365A1
  • Filed: 05/02/2003
  • Published: 11/13/2003
  • Est. Priority Date: 05/10/2002
  • Status: Active Grant
First Claim
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1. A liquid crystal display device having a reflective liquid crystal display element, the reflective liquid crystal display element comprising:

  • a set of substrates having an electrode to apply a voltage to a liquid crystal layer;

    a twisted liquid crystal layer interposed between the substrates;

    an elliptic polarizer consisting of a polarizer, a first retarder, and a second retarder having a slow axis substantially parallel to a bisector of alignment directions of liquid crystal material at substrate interfaces, and producing retardation of less than 140 nm; and

    a reflector reflecting light in a visible light range;

    wherein a product (nm) of birefringence Δ

    n of liquid crystal material used in the liquid crystal layer and a thickness d of the liquid crystal layer is not less than 120 nm, and not more than a value given by Formula 1;

    Formula 

     

    1;





    89.2+1.42×

    106
    [Re+(Re

    -270
    )
    ·

    cos

    (2



    α

    3
    -α

    2


    )
    ]
    2


    when a twist angle in the liquid crystal layer is in a range of 63 to 77 degrees, an angle between a transmission axis α

    1 of the polarizer and a slow axis α

    2 of the first retarder is in a range of 5 to 25 degrees or in a range of 95 to 115 degrees, an angle between the slow axis α

    2 of the first retarder and a slow axis α

    3 of the second retarder is in a range of 50 to 70 degrees, retardation produced by the second retarder is Re (nm), and retardation produced by the first retarder is Re′

    (nm).

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