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US5674576A
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Liquid crystalline optical device operable at a low drive voltage
Assignee: Gold Charm Ltd
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Filing: 1995-09-12
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Granted: 1997-10-07
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Expires: 2015-09-12
Abstract
Abstract In a liquid crystalline optical device, a light modulating layer composed of a liquid crystal and a high polymer resin is sandwiched between two substrates having electrode layers, at least one of the substrates being transparent. The polymer is a compound which is obtained by photopolymerization of a prepolymer containing a (meth)acryloyl compound having a stilbene skeleton, or a (meth)acryloyl compound including dioxane group or dioxolane group. The liquid crystalline optical device can be driven with a lower applied voltage and exhibits a reduced hysteresis.
Inventors
- 👤 Tomohisa Gotoh
- 👤 Taisaku Nakata
- 👤 Hideya Murai
- 👤 Etsuo Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:16
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/34; C09K19/3441; C09K19/3477; C09K19/32; C09K19/52; C09K19/54; C09K19/542; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13718; C09K19/3402; C09K19/3405; C09K2019/0444; C09K2019/0448; C09K2019/3408; C09K2019/3422; C09K2323/00; C09K2323/02; G02F1/13775; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acryloyl and methacryloyl, said first compound having a stilbene skeleton.
Claim 2
Dependent Claim
90 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acryloyl and methacryloyl, said first compound having a stilbene skeleton.
Claim 3
Dependent Claim
41 words
A liquid crystalline optical device as defined in claim 1 wherein said light modulating layer forms a planar texture in phase during absence of an applied voltage and forms a focal conic texture in phase during presence of an applied voltage.
Claim 4
Dependent Claim
36 words
A liquid crystalline optical device as defined in claim 1 wherein said precursor further contains at least one second compound selected from a group consisting of acryloyl, methacryloyl and said second compound having no stilbene skeleton.
Claim 5
Dependent Claim
26 words
A liquid crystalline optical device as defined in claim 3 wherein said precursor contains said first compound in an amount not lower than 30 wt %.
Claim 6
Dependent Claim
16 words
A liquid crystalline optical device as defined in claim 3 wherein said second compound includes fluorine.
Claim 7
Dependent Claim
26 words
A liquid crystalline optical device as defined in claim 5 wherein said precursor contains said first compound in an amount not lower than 60 wt %.
Claim 8
Dependent Claim
29 words
A liquid crystalline optical device as defined in claim 1 wherein said light modulating layer includes said polymer in an amount between 0.5 wt % and 8.0 wt %.
Claim 9
Dependent Claim
95 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acryloyl and methacryloyl, said first compound having at least one of dioxane and dioxolane groups.
Claim 10
Dependent Claim
95 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acryloyl and methacryloyl, said first compound having at least one of dioxane and dioxolane groups.
Claim 11
Dependent Claim
41 words
A liquid crystalline optical device as defined in claim 8 wherein said light modulating layer forms a planar texture in phase during absence of an applied voltage and forms a focal conic texture in phase during presence of an applied voltage.
Claim 12
Dependent Claim
29 words
A liquid crystalline optical device as defined in claim 8 wherein said light modulating layer includes said polymer in an amount between 0.5 wt % and 8.0 wt %.
Claim 13
Dependent Claim
55 words
A liquid crystalline optical device as defined in claim 8 wherein said first compound is expressed by the following formula: ##STR4## wherein R1 is selected from functional groups represented by: ##STR5## R2 is --O or a direct bond without an atom, and R3 is selected from a group consisting of --H and --CH 3 .
Claim 14
Dependent Claim
184 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acrylate and methacrylate, said first compound being represented by the following formula: ##STR6## wherein R1 is selected from a group consisting of radicals --H and --CH3, wherein R3, R4, R5 and R6 are independently selected from a group consisting of --H, --OH, halogen, amino, alkyl, alkoxy and aryl, and wherein X is selected from a group consisting of --CR 7 R 8 --, --O--, --NH-- and NR 9 , R 7 and R 8 being independently selected from a group consisting of --H, --OH, a halogen atom, amino, alkyl, alkoxy and aryl, R 9 being selected from a group consisting of alkyl and aryl.
Claim 15
Dependent Claim
184 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acrylate and methacrylate, said first compound being represented by the following formula: ##STR6## wherein R1 is selected from a group consisting of radicals --H and --CH3, wherein R3, R4, R5 and R6 are independently selected from a group consisting of --H, --OH, halogen, amino, alkyl, alkoxy and aryl, and wherein X is selected from a group consisting of --CR 7 R 8 --, --O--, --NH-- and NR 9 , R 7 and R 8 being independently selected from a group consisting of --H, --OH, a halogen atom, amino, alkyl, alkoxy and aryl, R 9 being selected from a group consisting of alkyl and aryl.
Claim 16
Dependent Claim
41 words
A liquid crystalline optical device as defined in claim 12 wherein said light modulating layer forms a planar texture in phase during absence of an applied voltage and forms a focal conic texture in phase during presence of an applied voltage.
Claim 17
Dependent Claim
29 words
A liquid crystalline optical device as defined in claim 12 wherein said light modulating layer includes said polymer in an amount between 0.5 wt % and 8.0 wt %.
Claim 18
Dependent Claim
185 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acryloyl and methacryloyl, said first compound being represented by the following formula: ##STR7## wherein R1 is selected from a group consisting of --H and --CH 3 , wherein R3, R4, R5 and R6 are independently selected from a group consisting of --H, --OH, halogen, amino, alkyl, alkoxy and aryl, and wherein X is selected from a group consisting of --CR 7 R 8 --, --O--, --NH-- and NR 9 , R 7 and R 8 being independently selected from a group consisting of --H, --OH, a halogen atom, amino, alkyl, alkoxy and aryl, R 9 being selected from a group consisting of alkyl and aryl.
Claim 19
Dependent Claim
185 words
A liquid crystalline optical device comprising a pair of substrates each having an electrode layer, at least one of said substrates being transparent, a light modulating layer sandwiched between said pair of substrates and composed of a liquid crystal and a polymer, said liquid crystal being one of a chiral nematic liquid crystal and a cholesteric liquid crystal, said polymer is a compound obtained by polymerizing a precursor containing at least one first compound selected from a group consisting of acryloyl and methacryloyl, said first compound being represented by the following formula: ##STR7## wherein R1 is selected from a group consisting of --H and --CH 3 , wherein R3, R4, R5 and R6 are independently selected from a group consisting of --H, --OH, halogen, amino, alkyl, alkoxy and aryl, and wherein X is selected from a group consisting of --CR 7 R 8 --, --O--, --NH-- and NR 9 , R 7 and R 8 being independently selected from a group consisting of --H, --OH, a halogen atom, amino, alkyl, alkoxy and aryl, R 9 being selected from a group consisting of alkyl and aryl.
Claim 20
Dependent Claim
41 words
A liquid crystalline optical device as defined in claim 15 wherein said light modulating layer forms a planar texture in phase during absence of an applied voltage and forms a focal conic texture in phase during presence of an applied voltage.
Claim 21
Dependent Claim
29 words
A liquid crystalline optical device as defined in claim 15 wherein said light modulating layer includes said polymer in an amount between 0.5 wt % and 8.0 wt %.
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