Liquid crystal display device
First Claim
Patent Images
1. A liquid crystal display device comprising:
- a TN liquid crystal cell constituted by sandwiching a nematic liquid crystal which is aligned at a twist angle of about 90°
between a first and a second transparent substrate each having transparent electrodes;
an absorption-type polarizing film provided on the outside, which is the visible side of said TN liquid crystal cell, of said second substrate;
a reflection-type polarizing film provided on the outside, which is the opposite side to the visible side of said TN liquid crystal cell, of said first substrate;
a scattering layer provided on the outside of said reflection-type polarizing film; and
a mirror reflector provided on the outside of said scattering layer reflecting light only incident from the visible side of said liquid crystal cell.
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Abstract
A TN liquid crystal cell constituted by sandwiching a nematic liquid crystal which is aligned at a twist angle of about 90° between a first and a second transparent substrate each of which has transparent electrodes is used, an absorption-type polarizing film is provided on the outside, which is the visible side, of the second substrate, and a reflection-type polarizing film, a scattering layer, and a mirror reflector are provided in order on the outside, which is the opposite side to the visible side of the TN liquid crystal cell, of the first substrate, thereby constituting a liquid crystal display device for performing a reflection display of information of character and image in an achromatic metallic tone within a bright diffused white background.
26 Citations
10 Claims
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1. A liquid crystal display device comprising:
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a TN liquid crystal cell constituted by sandwiching a nematic liquid crystal which is aligned at a twist angle of about 90°
between a first and a second transparent substrate each having transparent electrodes;
an absorption-type polarizing film provided on the outside, which is the visible side of said TN liquid crystal cell, of said second substrate;
a reflection-type polarizing film provided on the outside, which is the opposite side to the visible side of said TN liquid crystal cell, of said first substrate;
a scattering layer provided on the outside of said reflection-type polarizing film; and
a mirror reflector provided on the outside of said scattering layer reflecting light only incident from the visible side of said liquid crystal cell. - View Dependent Claims (2)
a TN liquid crystal cell constituted by sandwiching a nematic liquid crystal which is aligned at a twist angle of about 90°
between a first and a second transparent substrate each having transparent electrodes;
an absorption-type polarizing film provided on the outside, which is the visible side of said TN liquid crystal cell, of said second substrate;
a reflection-type polarizing film provided on the outside, which is the opposite side to the visible side of said TN liquid crystal cell, of said first substrate;
a scattering layer provided on the outside of said reflection-type polarizing film; and
a mirror reflector provided on the outside of said scattering layer, wherein said mirror reflector is a mirror transflective reflector, and a backlight is provided on the outside of said mirror transflective reflector.
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3. A liquid crystal display device comprising:
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an STN liquid crystal cell constituted by sandwiching a nematic liquid crystal which is aligned at a twist angle from 180°
to 270°
between a first and a second transparent substrate each having transparent electrodes;
an absorption-type polarizing film provided on the outside, which is the visible side of said STN liquid crystal cell, of said second substrate;
a retardation film provided between said absorption-type polarizing film and said second substrate;
a reflection-type polarizing film provided on the outside, which is the opposite side to the visible side of said STN liquid crystal cell, of said first substrate;
a scattering layer provided on the outside of said reflection-type polarizing film; and
a mirror reflector provided on the outside of said scattering layer reflecting light only incident from the visible side of said liquid crystal cell. - View Dependent Claims (4, 5, 6)
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5. A liquid crystal display device according to claim 3,
wherein said retardation film is a twisted retardation film, and a difference between an amount of birefringence of said STN liquid crystal cell and a retardation value of said twisted retardation film ranges from 0.15 μ - m to 0.25 μ
m.
- m to 0.25 μ
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6. A liquid crystal display device according to claim 3,
wherein said retardation film is a twisted retardation film, and a value of Δ - T=|Ts|−
|Tc| ranges from 0°
to 30°
where Δ
T is a difference between an absolute value of a twist angle Ts of said STN liquid crystal cell and an absolute value of a twist angle Tc of said twisted retardation film.
- T=|Ts|−
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7. A liquid crystal display device comprising:
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an STN liquid crystal cell constituted by sandwiching a nematic liquid crystal which is aligned at a twist angle from 180°
to 270°
between a first and a second transparent substrate each having transparent electrodes;
an absorption-type polarizing film provided on the outside, which is the visible side of said STN liquid crystal cell, of said second substrate;
a retardation film provided between said absorption-type polarizing film and said second substrate;
a reflection-type polarizing film provided on the outside, which is the opposite side to the visible side of said STN liquid crystal cell, of said first substrate;
a scattering layer provided on the outside of said reflection-type polarizing film; and
a mirror reflector provided on the outside of said scattering layer, wherein said mirror reflector is a mirror transfiective reflector, and a backlight is provided on the outside of said mirror transfiective reflector. - View Dependent Claims (8, 9, 10)
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9. A liquid crystal display device according to claim 7,
wherein said retardation film is a twisted retardation film, and a difference between an amount of birefringence of said STN liquid crystal cell and a retardation value of said twisted retardation film ranges from 0.15 μ - m to 0.25 μ
m.
- m to 0.25 μ
-
10. A liquid crystal display device according to claim 7,
wherein said retardation film is a twisted retardation film, and a value of Δ - T=|Ts|−
|Tc| ranges from 0°
to 30°
where Δ
T is a difference between an absolute value of a twist angle Ts of said STN liquid crystal cell and an absolute value of a twist angle Tc of said twisted retardation film.
- T=|Ts|−
Specification
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Current AssigneeCitizen Holdings Co., Ltd.
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Original AssigneeCitizen Watch Co Limited (Citizen Electronics Company Limited)
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InventorsArai, Makoto
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Primary Examiner(s)Parker, Kenneth
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Application NumberUS09/764,211Publication NumberTime in Patent Office1,173 DaysField of Search349/194, 349/98, 349/96, 349/114, 349/64US Class Current349/114CPC Class CodesG02F 1/133504 Diffusing, scattering, diff...G02F 1/133536 Reflective polarizers G02F1...G02F 2203/02 reflectiveG02F 2203/09 transflective
