Liquid crystal display device
First Claim
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1. A liquid crystal display device comprising:
- a liquid crystal cell formed by sealing a liquid crystal layer between a pair of transparent substrates having electrodes on the opposed inner surfaces respectively;
reflection-type polarizing films respectively disposed on both sides of the liquid crystal cell for transmitting a linearly polarized light in a direction parallel to a transmission axis and reflecting a linearly polarized light in a direction orthogonal to the transmission axis; and
absorption-type polarizing films respectively disposed outside said reflection-type polarizing films for transmitting a linearly polarized light in a direction parallel to a transmission axis and absorbing a linearly polarized light in a direction orthogonal to the transmission axis.
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Abstract
A liquid crystal display device (1) which can display information on both surfaces is structured: by respectively disposing reflection-type polarizing films (8, 9) which transmit a linearly polarized light in a direction parallel to a transmission axis and reflect a linearly polarized light in a direction orthogonal to the transmission axis on both sides of a liquid crystal cell (7) formed by sealing a liquid crystal layer (6) between a pair of two glass substrates (2, 3) with transparent electrodes (4, 5) formed on the opposed inner surfaces, while disposing absorption-type polarizing films (10, 11) respectively on both sides thereof, which transmit a linearly polarized light in a direction parallel to a transmission axis and absorb a linearly polarized light in a direction orthogonal to the transmission axis, and by disposing the reflection-type polarizing film and the absorption-type polarizing film (8) and (10), (9) and (11) which are disposed on the same side of the liquid crystal cell (7) so that the directions of these transmission axes almost correspond with each other.
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Citations
12 Claims
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1. A liquid crystal display device comprising:
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a liquid crystal cell formed by sealing a liquid crystal layer between a pair of transparent substrates having electrodes on the opposed inner surfaces respectively;
reflection-type polarizing films respectively disposed on both sides of the liquid crystal cell for transmitting a linearly polarized light in a direction parallel to a transmission axis and reflecting a linearly polarized light in a direction orthogonal to the transmission axis; and
absorption-type polarizing films respectively disposed outside said reflection-type polarizing films for transmitting a linearly polarized light in a direction parallel to a transmission axis and absorbing a linearly polarized light in a direction orthogonal to the transmission axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
wherein said reflection-type polarizing film and said absorption-type polarizing film which are disposed on the same side of said liquid crystal cell are disposed so that the directions of these transmission axes almost correspond with each other. -
3. The liquid crystal display device according to claim 1,
wherein at least one light scattering member is disposed between said liquid crystal cell and said reflection-type polarizing film on one side and between said liquid crystal cell and said reflection-type polarizing film on the other side. -
4. The liquid crystal display device according to claim 2,
wherein at least one light scattering member is disposed between said liquid crystal cell and said reflection-type polarizing film on one side and between said liquid crystal cell and said reflection-type polarizing film on the other side. -
5. The liquid crystal display device according to claim 1,
wherein the liquid crystal layer of said liquid crystal cell is made of a super twisted nematic liquid crystal. -
6. The liquid crystal display device according to claim 4,
wherein the liquid crystal layer of said liquid crystal cell is made of a super twisted nematic liquid crystal. -
7. The liquid crystal display device according to claim 1,
wherein the liquid crystal layer of said liquid crystal cell is made of the super twisted nematic liquid crystal, and a retardation film is disposed on one surface side of said liquid crystal cell. -
8. The liquid crystal display device according to claim 4,
wherein the liquid crystal layer of said liquid crystal cell is made of the super twisted nematic liquid crystal, and a retardation film is disposed on one surface side of said liquid crystal cell. -
9. The liquid crystal display device according to claim 1,
wherein the liquid crystal layer of said liquid crystal cell is made of a twisted nematic liquid crystal. -
10. The liquid crystal display device according to claim 4,
wherein the liquid crystal layer of said liquid crystal cell is made of a twisted nematic liquid crystal. -
11. The liquid crystal display device according to claim 1,
wherein the liquid crystal layer of said liquid crystal cell is made of a ferroelectric liquid crystal. -
12. The liquid crystal display device according to claim 4,
wherein the liquid crystal layer of said liquid crystal cell is made of a ferroelectric liquid crystal.
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Specification
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Current AssigneeCitizen Holdings Co., Ltd. (Citizen Electronics Company Limited)
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Original AssigneeCitizen Watch Co Limited (Citizen Electronics Company Limited)
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InventorsAkiyama, Takashi
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Primary Examiner(s)Dudek; James
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Application NumberUS09/645,520Time in Patent Office949 DaysField of Search349/96US Class Current349/96CPC Class CodesG02F 1/133342 for double-sided displaysG02F 1/133504 Diffusing, scattering, diff...G02F 1/133536 Reflective polarizers G02F1...
