US5233450A
Expired / Lapsed
US
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Liquid crystal photoconductive layer including a back-to-back diode
Assignee: Sharp Corp
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Filing: 1991-06-18
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Granted: 1993-08-03
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Expires: 2011-06-18
Abstract
Abstract A liquid crystal element of optical writing type includes a pair of transparent substrates respectively having electrodes formed on the overall surfaces thereof. The liquid crystal element also includes a photoconductive layer formed on one of the transparent substrates and having a back-to-back diode structure, which impedance is to be changed depending on an amount of incident light. The liquid crystal element further includes a mirror layer for reflecting light entered from the other side of a writing side of the photoconductive layer, and a liquid crystal layer disposed between the pair of transparent substrates.
Inventors
- 👤 Akitsugu Hatano
- 👤 Naofumi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1354
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
128 words
A liquid crystal element of optical writing type comprising: a first transparent substrate having an electrode formed on a surface thereof; a second transparent substrate having an electrode formed on a surface thereof; a photoconductive layer configured as a back-to-back diode with an impedance that varies according to an amount of incident light and formed on the electrode of said first transparent substrate; a liquid crystal layer disposed between said photoconductive layer and said second transparent substrate; and a reflective layer disposed between said photoconductive layer and said liquid crystal for reflecting a light through said liquid crystal layer, said photoconductive layer including a junction with a wider optical band gap at one side thereof adjacent the electrode of said first transparent substrate than at another side thereof.
Claim 2
Dependent Claim
128 words
A liquid crystal element of optical writing type comprising: a first transparent substrate having an electrode formed on a surface thereof; a second transparent substrate having an electrode formed on a surface thereof; a photoconductive layer configured as a back-to-back diode with an impedance that varies according to an amount of incident light and formed on the electrode of said first transparent substrate; a liquid crystal layer disposed between said photoconductive layer and said second transparent substrate; and a reflective layer disposed between said photoconductive layer and said liquid crystal for reflecting a light through said liquid crystal layer, said photoconductive layer including a junction with a wider optical band gap at one side thereof adjacent the electrode of said first transparent substrate than at another side thereof.
Claim 3
Dependent Claim
67 words
A liquid crystal element of optical writing type according to claim 1, wherein said photoconductive layer includes a first layer of P-type hydrogenated amorphous semiconductor, a second layer of an I-type hydrogenated amorphous semiconductor, a third layer of a N-type hydrogenated amorphous semiconductor, a fourth layer of an I-type hydrogenated amorphous semiconductor, and a fifth layer of a P-type hydrogenated amorphous semiconductor, said five layers being laminated.
Claim 4
Dependent Claim
26 words
A liquid crystal element of optical writing type according to claim 2, wherein said five layers are made of silicon, or germanium, as a main material.
Claim 5
Dependent Claim
61 words
A liquid crystal element of optical writing type according to claim 2, wherein said first layer is made of P-type hydrogenated amorphous silicon carbide and said second layer is made of I-type hydrogenated amorphous silicon carbide and said third layer is made of N-type hydrogenated amorphous silicon carbide, a hetero junction being formed between said second layer and said third layer.
Claim 6
Dependent Claim
54 words
A liquid crystal element of optical writing type according to claim 4, wherein said first layer is about 100-600 Å thick, said second layer is about 0.4-2.0 μm thick, said third layer is about 100-600 Å thick, said fourth layer is about 0.4-3 μm thick, and said fifth layer is about 100-600 Å thick.
Claim 7
Dependent Claim
68 words
A liquid crystal element of optical writing type according to claim 1, wherein said photoconductive layer includes a first layer of an N-type hydrogenated amorphous semiconductor, a second layer of an I-type hydrogenated amorphous semiconductor, a third layer of a P-type hydrogenated amorphous semiconductor, a fourth layer of an I-type hydrogenated amorphous semiconductor, and a fifth layer of an N-type hydrogenated amorphous semiconductor, said five layers being laminated.
Claim 8
Dependent Claim
26 words
A liquid crystal element of optical writing type according to claim 6, wherein said five layers are made of silicon, or germanium, as a main material.
Claim 9
Dependent Claim
60 words
A liquid crystal element of optical writing type according to claim 6, wherein said first layer is made of N-type hydrogenated amorphous silicon carbide, said second layer is made of I-type hydrogenated amorphous silicon carbide, and said third layer is made of P-type hydrogenated amorphous silicon carbide, a hetero junction being formed between said second layer and said third layer.
Claim 10
Dependent Claim
54 words
A liquid crystal element of optical writing type according to claim 8, wherein said first layer is about 100-600 Å thick, said second layer is about 0.4-2.0 μm thick, said third layer is about 100-600 Å thick, said fourth layer is about 0.4-3 μm thick, and said fifth layer is about 100-700 Å thick.
Claim 11
Dependent Claim
49 words
A liquid crystal element of optical writing type according to claim 6, wherein said first layer is made of N-type hydrogenated amorphous silicon carbide and said second layer is made of I-type hydrogenated amorphous silicon carbide, a hetero junction being formed between said second layer and said third layer.
Claim 12
Dependent Claim
49 words
A liquid crystal element of optical writing type according to claim 6, wherein said first layer is made of N-type hydrogenated amorphous silicon carbide and said second layer is made of I-type hydrogenated amorphous silicon carbide, a hetero junction being formed between said first layer and said second layer.
Claim 13
Dependent Claim
49 words
A liquid crystal element of optical writing type according to claim 6, wherein said first layer is made of N-type hydrogenated amorphous silicon nitride and said second layer is made of I-type hydrogenated amorphous silicon nitride, a hetero junction being formed between said first layer and said second layer.
Claim 14
Dependent Claim
49 words
A liquid crystal element of optical writing type according to claim 6, wherein said first layer is made of N-type hydrogenated amorphous silicon oxide and said second layer is made of I-type hydrogenated amorphous silicon oxide, a hetero junction being formed between said first layer and said second layer.
Claim 15
Dependent Claim
24 words
A liquid crystal element of optical writing type according to claim 1, wherein said photoconductive layer comprises silicon, or germanium, as a main material.
Claim 16
Dependent Claim
22 words
A liquid crystal element of optical writing type according to claim 1, wherein said junction comprises a hetero junction or homo junction.
Claim 17
Dependent Claim
56 words
A liquid crystal element of optical writing type according to claim 1, wherein said element further comprises: a pair of reflection-preventing films formed on said first and second transparent substrates, respectively; a light-blocking layer formed between said reflective layer and said first transparent substrate; and alignment layers formed on both sides of said liquid crystal layer.
Claim 18
Dependent Claim
37 words
A liquid crystal element of optical writing type according to claim 1, wherein said liquid crystal layer comprises a nematic liquid crystal, a smectic liquid crystal, a polymeric liquid crystal, or a polymer dispersed liquid crystal film.
References Cited (Backward Citations)
US4206979A
Cited
JPS5734525A
Cited
JPS57100411A
Cited
JPS57199272A
Cited
US4622654A
Cited
US4917474A
Cited
US4600935A
Cited
US4842376A
Cited
US4881110A
Cited
EP0265903A2
Cited
US4925276A
Cited
US4799773A
Cited
US4941735A
Cited
US5084777A
Cited
US5132814A
Cited
WO1991014961A1
Cited
US5153761A
Cited
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| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
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