Color liquid crystal display device
First Claim
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1. A color liquid crystal display device, comprising:
- a nematic liquid crystal layer having a positive dielectric anisotropy and including a chiral material interposed between two substrates each having a transparent electrode and an alignment layer formed in substantially parallel;
a twist angle of the liquid crystal layer, formed by the alignment layer is 160°
-300°
;
a pair of polarizers disposed outside the liquid crystal layer;
a birefringent plate disposed at at least one side of the liquid crystal layer; and
a driving circuit configured to apply a driving voltage across the transparent electrodes, wherein;
a product Δ
n1·
d1 of a refractive index anisotropy of liquid crystal of the liquid crystal layer and a thickness d1 of the liquid crystal layer is 1.2-2.5 μ
m;
the birefringent plate has a slow axis and a fast axis;
a sum of a product Δ
n2·
d2 of the refractive index anisotropy of the slow axis and the fast axis and a thickness in a vertical direction is 1.2-2.5 μ
m;
when in a multiplex driving using a voltage averaging method, N represents a number of scanning electrodes, PN=N0.5+1 and BR=(Vr+Vc)/(Vc), a ratio (Vr+Vc)/(Vc) of a magnitude (Vr+Vr) of a voltage in a selection time to a magnitude (Vc) of a voltage in a non-selection time in a time that a pixel signal produced by a scanning signal and a data signal is in an ON display, BR≦
PN−
2 is satisfied; and
a voltage value of 3 or more is selected.
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Abstract
A reflective type STN color liquid crystal display device having polarizers a liquid crystal layer a birefringent plate, an absorbing axis of upper polarizer, an absorbing axis of lower polarizer. Also include is the direction of a long axis of a liquid crystal molecule at an upper side of the liquid crystal layer, the direction of a long axis of a liquid crystal molecule at a lower side, a slow axis of birefringent plate, scanning electrodes of an N number, and data electrodes. Further BR≦PN−2 is satisfied when PN=N0.5+1 and bias value BR=(Vr+Vc)/(Vc).
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Citations
19 Claims
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1. A color liquid crystal display device, comprising:
-
a nematic liquid crystal layer having a positive dielectric anisotropy and including a chiral material interposed between two substrates each having a transparent electrode and an alignment layer formed in substantially parallel;
a twist angle of the liquid crystal layer, formed by the alignment layer is 160°
-300°
;
a pair of polarizers disposed outside the liquid crystal layer;
a birefringent plate disposed at at least one side of the liquid crystal layer; and
a driving circuit configured to apply a driving voltage across the transparent electrodes, wherein;
a product Δ
n1·
d1 of a refractive index anisotropy of liquid crystal of the liquid crystal layer and a thickness d1 of the liquid crystal layer is 1.2-2.5 μ
m;
the birefringent plate has a slow axis and a fast axis;
a sum of a product Δ
n2·
d2 of the refractive index anisotropy of the slow axis and the fast axis and a thickness in a vertical direction is 1.2-2.5 μ
m;
when in a multiplex driving using a voltage averaging method, N represents a number of scanning electrodes, PN=N0.5+1 and BR=(Vr+Vc)/(Vc), a ratio (Vr+Vc)/(Vc) of a magnitude (Vr+Vr) of a voltage in a selection time to a magnitude (Vc) of a voltage in a non-selection time in a time that a pixel signal produced by a scanning signal and a data signal is in an ON display, BR≦
PN−
2 is satisfied; and
a voltage value of 3 or more is selected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification
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Current AssigneeOptrex Corporation (Kyocera Corporation)
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Original AssigneeOptrex Corporation (Kyocera Corporation)
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InventorsMori, Haruki, Ozeki, Masao
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Primary Examiner(s)Saras, Steven J.
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Assistant Examiner(s)Alphonse, Fritz
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Application NumberUS09/065,729Time in Patent Office1,012 DaysField of Search345/88, 345/89, 345/87, 349/78, 349/117, 349/118, 349/119US Class Current345/88CPC Class CodesG02F 1/1397 the twist being substantial...G09G 3/3622 using a passive matrix G09G...
