US4641924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device
Assignee: Hitachi Ltd
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Filing: 1985-01-31
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Granted: 1987-02-10
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Expires: 2005-01-31
Abstract
Abstract A liquid crystal device comprising a thermal writing type liquid crystal, an electrode for generating heat necessary for said thermal writing, and a support for supporting said liquid crystal and said electrode, wherein a material having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said electrode and that of said support is arranged between said electrode and said support, whereby said electrode for generating heat can be prevented from being degraded by failure or peeling from the support due to thermal stress.
Inventors
- 👤 Yoshiharu Nagae
- 👤 Shunichi Numata
- 👤 Noriyuki Kinjo
- 👤 Katuyuki Funahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/132; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1039; C08G73/1067; C08G73/1071
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
116 words
A liquid crystal device comprising a thermal writing type liquid crystal, an electrode for generating heat necessary for said thermal writing, and a support for supporting said crystal and said electrode, and an insulating layer having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said electrode and that of said support, arranged between said electrode and said support, wherein said insulating layer comprises a polyimide having a chemical structural unit represented by the following formula [I]: ##STR8## wherein Ar 1 is an aromatic group selected from the group consisting of ##STR9## (wherein R is a lower alkyl group or a fluorine-containing lower alkyl group, and n is 0 to 4), ##STR10##
Claim 2
Dependent Claim
116 words
A liquid crystal device comprising a thermal writing type liquid crystal, an electrode for generating heat necessary for said thermal writing, and a support for supporting said crystal and said electrode, and an insulating layer having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said electrode and that of said support, arranged between said electrode and said support, wherein said insulating layer comprises a polyimide having a chemical structural unit represented by the following formula [I]: ##STR8## wherein Ar 1 is an aromatic group selected from the group consisting of ##STR9## (wherein R is a lower alkyl group or a fluorine-containing lower alkyl group, and n is 0 to 4), ##STR10##
Claim 3
Dependent Claim
45 words
A liquid crystal device in accordance with claim 1, wherein said insulating layer additionally contains a polyimide having a chemical structural unit represented by the following formula [III]: ##STR11## wherein Ar 2 is a bivalent aromatic group and Ar 3 is a tetravalent aromatic group.
Claim 4
Dependent Claim
16 words
A liquid crystal device in accordance with claim 1, wherein said insulating layer is a laminate.
Claim 5
Dependent Claim
21 words
A liquid crystal device in accordance with claim 1, wherein said insulating layer additionally contains a white material for reflecting light.
Claim 6
Dependent Claim
82 words
A liquid crystal device comprising a thermal writing type liquid crystal, an electrode for generating heat necessary for said thermal writing, and a support for supporting said crystal and said electrode, and an insulating layer having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said electrode and that of said support, arranged between said electrode and said support, wherein said insulating layer comprises a polyimide having a chemical structural unit represented by the following formula [II]: ##STR12##
Claim 7
Dependent Claim
82 words
A liquid crystal device comprising a thermal writing type liquid crystal, an electrode for generating heat necessary for said thermal writing, and a support for supporting said crystal and said electrode, and an insulating layer having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said electrode and that of said support, arranged between said electrode and said support, wherein said insulating layer comprises a polyimide having a chemical structural unit represented by the following formula [II]: ##STR12##
Claim 8
Dependent Claim
16 words
A liquid crystal device in accordance with claim 5, wherein said insulating layer is a laminate.
Claim 9
Dependent Claim
21 words
A liquid crystal device in accordance with claim 5, wherein said insulating layer additionally contains a white material for reflecting light.
Claim 10
Dependent Claim
121 words
A liquid crystal device comprising a thermal writing type liquid crystal, a heat electrode for generating heat necessary for said thermal writing, and a support for supporting said crystal and said heat electrode, said device further comprising an insulating layer having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said heat electrode and that of said support, arranged between the heat electrode and support, the coefficient of thermal expansion of said insulating layer, relative to that of the support and heat electrode, being such that heat electrode failure or peeling from the support due to thermal stress resulting from the difference between the coefficient of thermal expansion of the heat electrode and the support is avoided.
Claim 11
Dependent Claim
121 words
A liquid crystal device comprising a thermal writing type liquid crystal, a heat electrode for generating heat necessary for said thermal writing, and a support for supporting said crystal and said heat electrode, said device further comprising an insulating layer having a coefficient of thermal expansion lying between the coefficient of thermal expansion of said heat electrode and that of said support, arranged between the heat electrode and support, the coefficient of thermal expansion of said insulating layer, relative to that of the support and heat electrode, being such that heat electrode failure or peeling from the support due to thermal stress resulting from the difference between the coefficient of thermal expansion of the heat electrode and the support is avoided.
Claim 12
Dependent Claim
17 words
A liquid crystal device in accordance with claim 8, wherein the insulating layer comprises an organic polymer.
Claim 13
Dependent Claim
24 words
A liquid crystal device in accordance with claim 9, wherein the insulating layer comprises a composite of an inorganic material and said organic polymer.
Claim 14
Dependent Claim
27 words
A liquid crystal device in accordance with claim 9, wherein the insulating layer comprises powders, fibers or chopped strands incorporated in a layer of the organic polymer.
Claim 15
Dependent Claim
37 words
A liquid crystal device in accordance with claim 8, wherein said insulating layer is arranged so as to form a hexahedron of which the bottom coincides with the surface of the heat electrode closest to the substrate.
Claim 16
Dependent Claim
24 words
A liquid crystal device in accordance with claim 8, wherein said insulating layer is a laminate of a plurality of layers of different materials.
Claim 17
Dependent Claim
68 words
A liquid crystal device in accordance with claim 13, wherein the layers of different materials have different coefficients of thermal expansion, with the layer of material having a coefficient of thermal expansion closest to that of the support being located nearest the support, and the layer of material having a coefficient of thermal expansion closest to that of the heat electrode being located nearest to the heat electrode.
Claim 18
Dependent Claim
21 words
A liquid crystal device in accordance with claim 8, wherein said insulating layer additionally contains a white material for reflecting light.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |