Patent ID: 6801283
Filing Date: 2004-10-05
Classification: G02F

Abstract:
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 &Dgr;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:&it;â€ƒ89.2+1.42Ã—106[Re+(Reâ€²-270)&CenterDot;cos&af;(2&it;&LeftBracketingBar;Î±3-Î±2&RightBracketingBar;)]2when a twist angle in the liquid crystal layer is in a range of 63 to 77 degrees, an angle between a transmission axis &agr;1 of the polarizer and a slow axis &agr;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 &agr;2 of the first retarder and a slow axis &agr;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 Reâ€² (nm).