Patent US5812227A successfully refreshed from Google Patents.
US5812227A
Expired / Lapsed
US
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Liquid crystal device, display apparatus using same and display method using same
Assignee: Canon Inc
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Filing: 1993-04-01
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Granted: 1998-09-22
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Expires: 2013-04-01
Abstract
Abstract The liquid crystal device is constituted by disposing a display layer between a pair of electrode plates. The display layer comprises a porous polymer material having open pores partially filled and a low-molecular weight mesomorphic compound impregnating the porous polymer material. The display layer is free from an unfilled portion of the low-molecular weight mesomorphic compound to be effective for providing a liquid crystal device showing a high transmittance and a good contrast. The display layer also comprises a three dimensional network structure coated with a polymer layer, and a low-molecular weight mesomorphic compound impregnating the three-dimensional network structure. The display layer is free from a fibrous part which is unstable against an applied voltage to be effective for providing a liquid crystal device showing no hysteresis.
Inventors
- 👤 Yomishi Toshida
- 👤 Kazuo Yoshinaga
- 👤 Toshikazu Ohnishi
- 👤 Koichi Sato
- 👤 Takeo Eguchi
- 👤 Tsuyoshi Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:10
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; C09K2019/546; G02F1/13345
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
67 words
A liquid crystal device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon, and a display layer disposed between the electrode plates; said display layer comprising a porous polymer material having open pores, a portion of said open pores containing a filling substance and the remaining portion of said open pores containing a low-molecular weight mesomorphic compound other than said filling substance.
Claim 2
Dependent Claim
67 words
A liquid crystal device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon, and a display layer disposed between the electrode plates; said display layer comprising a porous polymer material having open pores, a portion of said open pores containing a filling substance and the remaining portion of said open pores containing a low-molecular weight mesomorphic compound other than said filling substance.
Claim 3
Dependent Claim
19 words
A device according to claim 1, wherein said open pores have a pore diameter of at most 0.5 μm.
Claim 4
Dependent Claim
18 words
A device according to claim 1, wherein said porous polymer material has a porosity of 80 to 98%.
Claim 5
Dependent Claim
60 words
A display apparatus, including: a display device according to any one of claims 1, 2 or 3; means for applying voltage to said display device; means for illuminating said display device with light, thereby separating said light into transmitted light and scattered light; and means for projecting said transmitted light passed through said display device onto a projection image-receiving member.
Claim 6
Dependent Claim
28 words
A liquid crystal device according to claim 1, wherein said filling substance comprises a material having a solubility parameter of at least 12 (cal/cm 3 ) 1/2 .
Claim 7
Dependent Claim
34 words
A device according to claim 5, wherein said open pores containing said material having a solubility parameter of at least 12 (cal/cm 3 ) 1/2 have a pore diameter of at most 0.5 μm.
Claim 8
Dependent Claim
18 words
A device according to claim 5, wherein said porous polymer material has a porosity of 80 to 98%.
Claim 9
Dependent Claim
57 words
A display apparatus, including: a display device according to any one of claims 5-7; means for applying voltage to said display device; means for illuminating said display device with light, thereby separating said light into transmitted light and scattered light; and means for projecting said transmitted light passed through said display device onto a projection image-receiving member.
Claim 10
Dependent Claim
62 words
A liquid crystal device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon, and a three-dimensional network structure disposed between the pair of electrode plates, wherein said three-dimensional network structure has open pores providing surfaces, and said surfaces are coated with a polymer layer to leave a space which is filled with a low-molecular weight mesomorphic compound.
Claim 11
Dependent Claim
62 words
A liquid crystal device, comprising: a pair of electrode plates each comprising a substrate and an electrode thereon, and a three-dimensional network structure disposed between the pair of electrode plates, wherein said three-dimensional network structure has open pores providing surfaces, and said surfaces are coated with a polymer layer to leave a space which is filled with a low-molecular weight mesomorphic compound.
Claim 12
Independent Claim
18 words
A device according to claims 9, wherein said polymer layer has a thickness of 0.2 to 2 μm.
Claim 13
Dependent Claim
23 words
A device according to claim 9, wherein said polymer layer shows a solubility parameter of as least 12 (cal/cm 3 ) 1/2 .
Claim 14
Dependent Claim
24 words
A device according to claim 5, wherein said three-dimensional network structure comprises a stretched porous polymer film having a porosity of 80 to 98%.
Claim 15
Dependent Claim
57 words
A display apparatus, including: a display device according to any one of claims 9-12; means for applying voltage to said display device; means for illuminating said display device with light, thereby separating said light into transmitted light and scattered light; and means for projecting said transmitted light passed through said display device onto a projection image-receiving member.
Claim 16
Dependent Claim
77 words
A process for producing a liquid crystal device comprising a pair of electrode plates each comprising a substrate and an electrode thereon, and a display layer disposed between the electrode plates comprising a porous polymer material having open pores; said process comprising the steps of: filling a portion of said open pores with a filling substance, and then filling the remaining portion of said open pores with a low-molecular weight mesomorphic compound other than said filling substance.
Claim 17
Dependent Claim
77 words
A process for producing a liquid crystal device comprising a pair of electrode plates each comprising a substrate and an electrode thereon, and a display layer disposed between the electrode plates comprising a porous polymer material having open pores; said process comprising the steps of: filling a portion of said open pores with a filling substance, and then filling the remaining portion of said open pores with a low-molecular weight mesomorphic compound other than said filling substance.
Claim 18
Dependent Claim
26 words
A process according to claim 14, wherein said filling substance comprises a material having a solubility parameter of at least 12 (cal/cm 3 ) 1/2 .
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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) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |