Transflective liquid crystal display device having particular angles between optical axes
First Claim
Patent Images
1. A transflective liquid crystal display device capable of balancing color difference between a reflective region and a transmissive region, comprising:
- a first substrate;
a second substrate;
a liquid crystal layer disposed between the first and the second substrates;
a first polarization plate arranged on the first substrate and opposite to the liquid crystal layer;
a second polarization plate ranged on the second substrate and opposite to the liquid crystal layer;
a first half-wavelength, (λ
/2) plate arranged between the first polarization plate and the liquid crystal layer;
a first quarter wavelength (λ
/4) plate arranged between the first half-wavelength plate and the liquid crystal layer;
a first alignment film arranged between the first quarter wavelength plate and the liquid crystal layer;
a second half-wavelength (λ
/2) plate arranged between the second polarization plate and the liquid crystal layer;
a second quaffer wavelength (λ
/4) plate arranged between the second half-wavelength plate and the liquid crystal layer;
a second alignment film arranged between the second quarter wavelength plate and the liquid crystal layer;
a reflective electrode and a transparent electrode arranged in-plane between the second alignment film and the second substrate; and
a backlight arranged on a surface of the second polarization plate and opposite to the second substrate,whereina twist angle of the liquid crystal is 40°
to 80°
, a retardation (Δ
n×
d)LC of the liquid crystal is 200 to 300 nm,an angle (β
up) between a rubbing direction of the first alignment film and a transmissive axis of the first polarization plate is −
20°
to −
60°
,an angle (β
down) between a rubbing direction of the second alignment film and a transmissive axis of the second polarization plate is −
20°
to 20°
,an angle (θ
up) between the transmissive axis of the first polarization plate and a retardation axis of the first half-wavelength (λ
/2) plate is 60°
to 110°
,an angle (θ
down) between the transmissive axis of the second polarization plate and a retardation axis of the second half-wavelength (λ
/2) plate is −
30°
to 20°
,an angle between the retardation axis of the first half-wavelength (λ
/2) plate and a retardation axis of the first quarter wavelength (λ
/4) plate is 30°
to 100°
, andan angle between the retardation axis of the second half-wavelength (λ
/2) plate and a retardation axis of the second quarter wavelength (λ
/4) plate is 30°
to 80°
.
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Abstract
A transflective liquid crystal device capable of balancing a color difference between a reflective region and a transmissive region. The arrangement conditions of optical elements in the transflective LCD are as follows. The twist angle of the liquid crystal is about 40°˜80°. The angles βup, βdown, θup and θdown are about −20°˜−60°, −20°˜20°, 60°˜110°, −30°˜20° respectively. The angle between the retardation axes of the upper λ/2 plate and the upper λ/4 plate is about 30°˜100°, and the angle between the retardation axes of the lower λ/2 plate and the lower λ/4 plate is about 30°˜80°.
14 Citations
3 Claims
-
1. A transflective liquid crystal display device capable of balancing color difference between a reflective region and a transmissive region, comprising:
-
a first substrate; a second substrate; a liquid crystal layer disposed between the first and the second substrates; a first polarization plate arranged on the first substrate and opposite to the liquid crystal layer; a second polarization plate ranged on the second substrate and opposite to the liquid crystal layer; a first half-wavelength, (λ
/2) plate arranged between the first polarization plate and the liquid crystal layer;a first quarter wavelength (λ
/4) plate arranged between the first half-wavelength plate and the liquid crystal layer;a first alignment film arranged between the first quarter wavelength plate and the liquid crystal layer; a second half-wavelength (λ
/2) plate arranged between the second polarization plate and the liquid crystal layer;a second quaffer wavelength (λ
/4) plate arranged between the second half-wavelength plate and the liquid crystal layer;a second alignment film arranged between the second quarter wavelength plate and the liquid crystal layer; a reflective electrode and a transparent electrode arranged in-plane between the second alignment film and the second substrate; and a backlight arranged on a surface of the second polarization plate and opposite to the second substrate, wherein a twist angle of the liquid crystal is 40°
to 80°
, a retardation (Δ
n×
d)LC of the liquid crystal is 200 to 300 nm,an angle (β
up) between a rubbing direction of the first alignment film and a transmissive axis of the first polarization plate is −
20°
to −
60°
,an angle (β
down) between a rubbing direction of the second alignment film and a transmissive axis of the second polarization plate is −
20°
to 20°
,an angle (θ
up) between the transmissive axis of the first polarization plate and a retardation axis of the first half-wavelength (λ
/2) plate is 60°
to 110°
,an angle (θ
down) between the transmissive axis of the second polarization plate and a retardation axis of the second half-wavelength (λ
/2) plate is −
30°
to 20°
,an angle between the retardation axis of the first half-wavelength (λ
/2) plate and a retardation axis of the first quarter wavelength (λ
/4) plate is 30°
to 100°
, andan angle between the retardation axis of the second half-wavelength (λ
/2) plate and a retardation axis of the second quarter wavelength (λ
/4) plate is 30°
to 80°
. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeAU Optronics Corporation
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Original AssigneeAU Optronics Corporation
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InventorsChen, Po-Lun, Wu, Yang-En
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Primary Examiner(s)Schechter, Andrew
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Assistant Examiner(s)CHIEN, LUCY P
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Application NumberUS10/798,942Publication NumberTime in Patent Office705 DaysField of Search349/117, 349/119, 349/143, 349/147, 349/96, 349/138, 349/144US Class Current349/114CPC Class CodesG02F 1/133555 TransflectorsG02F 1/13363 Birefringent elements, e.g....G02F 1/133638 Waveplates, i.e. plates wit...G02F 1/1398 the twist being below 90°G02F 2413/04 Number of plates greater th...G02F 2413/08 with a particular optical a...
