Liquid crystal display apparatus
First Claim
Patent Images
1. A liquid crystal display apparatus, comprising:
- a pair of spaced substrates including an upper substrate and a lower substrate;
a liquid crystal layer disposed between said substrates;
an upper polarizer arranged on one side of said pair of substrates;
a lower polarizer arranged on the other side of said pair of substrates;
an upper phase plate arranged between said pair of substrates and the upper polarizer; and
a lower phase plate arranged between said pair of substrates and the lower polarizer;
whereinsaid liquid crystal layer has a twist angle in a range from at least 200°
to less than 360°
;
a product of the layer thickness and birefringence of the liquid crystal layer is in a range of 0.80 μ
m-0.90 μ
m;
an azimuth of the transmittance axis of the upper polarizer is in a range of 30°
-70°
;
an azimuth of the transmittance axis of the lower polarizer is in a range of 60°
-90°
;
an azimuth of the slow axis of the upper phase plate is in a range of 150°
-190°
;
an azimuth of the slow axis of the lower phase plate is in a range of 30°
-80°
;
the retardation of the upper phase plate at a wave length of 550 nm is in a range of 200 nm-300 nm; and
the retardation of the lower phase plate at a wave length of 550 nm is in a range of 500 nm-620 nm;
wherein the azimuth is defined as an angle measured counter-clockwise from a direction of 0°
, and which direction of 0°
equally divides an angle formed between respective orientation treatment directions of upper and lower orientation layers of the upper and lower substrates.
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Abstract
A color STN-LCD having preferable display quality and decreased manufacturing cost uses a liquid crystal display apparatus which includes a liquid crystal layer having a twist angle in a range from 200° and less than 360°, a retardation of the liquid crystal layer in a range of 0.80 μm˜0.90 μm, an azimuth of transmittance axis of the upper polarizer in a range of 30°˜70°, an azimuth of the transmittance axis of the lower polarizer in a range of 60°˜90°, an azimuth of the slow axis of the upper phase plate in a range of 150°˜190°, an azimuth of the slow axis of the lower phase plate in a range of 30°˜80°, a retardation of the upper phase plate at a wave length of 550 nm in a range of 200 nm˜300 nm, and a retardation of the lower phase plate at a wave length of 550 nm in a range of 500 nm˜620 nm.
24 Citations
7 Claims
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1. A liquid crystal display apparatus, comprising:
-
a pair of spaced substrates including an upper substrate and a lower substrate; a liquid crystal layer disposed between said substrates; an upper polarizer arranged on one side of said pair of substrates; a lower polarizer arranged on the other side of said pair of substrates; an upper phase plate arranged between said pair of substrates and the upper polarizer; and a lower phase plate arranged between said pair of substrates and the lower polarizer;
whereinsaid liquid crystal layer has a twist angle in a range from at least 200°
to less than 360°
;a product of the layer thickness and birefringence of the liquid crystal layer is in a range of 0.80 μ
m-0.90 μ
m;an azimuth of the transmittance axis of the upper polarizer is in a range of 30°
-70°
;an azimuth of the transmittance axis of the lower polarizer is in a range of 60°
-90°
;an azimuth of the slow axis of the upper phase plate is in a range of 150°
-190°
;an azimuth of the slow axis of the lower phase plate is in a range of 30°
-80°
;the retardation of the upper phase plate at a wave length of 550 nm is in a range of 200 nm-300 nm; and the retardation of the lower phase plate at a wave length of 550 nm is in a range of 500 nm-620 nm; wherein the azimuth is defined as an angle measured counter-clockwise from a direction of 0°
, and which direction of 0°
equally divides an angle formed between respective orientation treatment directions of upper and lower orientation layers of the upper and lower substrates. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A liquid crystal display apparatus, comprising:
-
a pair of spaced substrates including an upper substrate and a lower substrate; a liquid crystal layer disposed between said substrates; an upper polarizer arranged on one side of said pair of substrates; a lower polarizer arranged on the other side of said pair of substrates; an upper phase plate arranged between said pair of substrates and the upper polarizer; and a lower phase plate arranged between said pair of substrates and the lower polarizer;
whereinsaid liquid crystal layer has a twist angle in a range from at least 200°
to less than 360°
;a product of the layer thickness and birefringence of the liquid crystal layer is in a range of 0.84 μ
m-0.88 μ
m;an azimuth of the transmittance axis of the upper polarizer is in a range of 35°
-65°
;an azimuth of the transmittance axis of the lower polarizer is in a range of 65°
-85°
;an azimuth of the slow axis of the upper phase plate is in a range of 160°
-180°
;an azimuth of the slow axis of the lower phase plate is in a range of 40°
-70°
;the retardation of the upper phase plate at a wave length of 550 nm is in a range of 220 nm-280 nm; and the retardation of the lower phase plate at a wave length of 550 nm is in a range of 540 nm-600 nm; wherein the azimuth is defined as an angle measured counter-clockwise from a direction of 0°
, and which direction of 0°
equally divides an angle formed between respective orientation treatment directions of upper and lower orientation layers of the upper and lower substrates.
-
-
7. A liquid crystal display apparatus, comprising:
-
a pair of spaced substrates including an upper substrate and a lower substrate; a liquid crystal layer disposed between said substrates; an upper polarizer arranged on one side of said pair of substrates; a lower polarizer arranged on the other side of said pair of substrates; an upper phase plate arranged between said pair of substrates and the upper polarizer; and a lower phase plate arranged between said pair of substrates and the lower polarizer;
whereinsaid liquid crystal layer has a twist angle in a range from at least 200°
to less than 360°
;a product of the layer thickness and birefringence of the liquid crystal layer is in a range 0.85 μ
m-0.87 μ
m;an azimuth of the transmittance axis of the upper polarizer is in a range of 45°
-55°
;an azimuth of the transmittance axis of the lower polarizer is in a range of 70°
-80°
;an azimuth of the slow axis of the upper phase plate is in a range of 165°
-180°
;an azimuth of the slow axis of the lower phase plate is in a range of 50°
-60°
;the retardation of the upper phase plate at a wave length of 550 nm is in a range of 250 nm-270 nm; and the retardation of the lower phase plate at a wave length of 550 nm is in a range of 540 nm-590 nm; wherein the azimuth is defined as an angle measured counter-clockwise from a direction of 0°
, and which direction of 0°
equally divides an angle formed between respective orientation treatment directions of upper and lower orientation layers of the upper and lower substrates.
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Specification
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Current AssigneeHitachi Device Engineering Co., Ltd., Hitachi, Ltd.
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Original AssigneeHitachi Device Engineering Co., Ltd., Hitachi, Ltd.
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InventorsKikuchi, Naoki, Kondo, Katsumi, Utsumi, Yuka, Nakamura, Yoshiaki, Hirakata, Junichi, Itoh, Osamu
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Primary Examiner(s)Sikes, William L.
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Assistant Examiner(s)DUDEK, JAMES A
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Application NumberUS08/583,658Time in Patent Office1,040 DaysField of Search349/119, 349/121US Class Current349/119CPC Class CodesG02F 1/133531 characterised by the arrang...G02F 1/13363 Birefringent elements, e.g....G02F 1/1397 the twist being substantial...G02F 2202/40 Materials having a particul...G02F 2413/02 Number of plates being 2G02F 2413/08 with a particular optical a...
