Liquid crystal display device
First Claim
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;
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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Accused Products
Abstract
A liquid crystal display device has an elliptic polarizer consisting of a polarizer, a first retarder, and a second retarder, and a reflector reflecting light in a visual light range. Optimal values for a twist angle of a liquid crystal layer, an angle between a transmission axis of the polarizer and a slow axis of the first retarder, an angle between the slow axis of the first retarder and a slow axis of the second retarder, and a product of birefringence Δn of liquid crystal material used in the liquid crystal layer and a thickness d of the liquid crystal layer are evaluated.
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Citations
18 Claims
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1. A liquid crystal display device having a reflective liquid crystal display element, the reflective liquid crystal display element comprising:
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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;
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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification