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US5285304A
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Ferroelectric liquid crystal device having spacers including the thermosetting adhesive particles and the thermoplastic polymer particles
Assignee: Canon Inc
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Filing: 1993-01-25
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Granted: 1994-02-08
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Expires: 2013-01-25
Abstract
Abstract There is provided a ferroelectric liquid crystal device wherein the yellowing due to a cell thickness increase or occurrence of voids is suppressed. The ferroelectric liquid crystal device includes a pair of substrates each having thereon a group of electrodes for liquid crystal drive, and a layer of ferroelectric liquid crystal disposed between the substrates, wherein thermosetting adhesive particles and thermoplastic polymer particles having a diameter which is 1.5-5 times the liquid crystal layer thickness are dispersed and pressed between the substrates. The polymer particles preferably have a glass transition temperature of at most -20° C.
Inventors
- 👤 Yoshio Hotta
- 👤 Yukio Hanyu
- 👤 Tadashi Mihara
- 👤 Yasuto Kodera
- 👤 Katsutoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13392
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having thereon a group of electrodes for liquid crystal drive, and a layer of ferroelectric liquid crystal disposed between the substrates, wherein thermosetting adhesive particles and thermoplastic polymer particles respectively having a diameter which is 1.5-5 times the liquid crystal layer thickness are dispersed and pressed between the substrates. g
Claim 2
Dependent Claim
61 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having thereon a group of electrodes for liquid crystal drive, and a layer of ferroelectric liquid crystal disposed between the substrates, wherein thermosetting adhesive particles and thermoplastic polymer particles respectively having a diameter which is 1.5-5 times the liquid crystal layer thickness are dispersed and pressed between the substrates. g
Claim 3
Dependent Claim
44 words
A device according to claim 1, wherein said ferroelectric liquid crystal is placed in a uniform alignment state satisfying a relationship of H>θa>H/2, wherein H denotes a half of cone angle and θa denotes an apparent tilt angle, respectively, of the ferroelectric liquid crystal.
Claim 4
Dependent Claim
37 words
A device according to claim 1, wherein said polymer particles are dispersed at a rate of at least 40 particles/mm 2 and said adhesive particles are dispersed at a rate of at least 40 particles/mm 2 .
Claim 5
Dependent Claim
38 words
A device according to claim 1, wherein said polymer particles comprise at least one material selected from the group consisting of high-density polyethylene, low-density polyethylene, acrylic urethane resin, acrylic resin containing butyl rubber, nylon, and silicone rubber resin.
Claim 6
Dependent Claim
57 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having thereon a group of electrodes for liquid crystal drive, and a layer of ferroelectric liquid crystal disposed between the substrates, wherein thermosetting adhesive particles and thermoplastic polymer particles having a glass transition temperature of at most -20° C. are dispersed and pressed between the substrates.
Claim 7
Dependent Claim
57 words
A ferroelectric liquid crystal device, comprising: a pair of substrates each having thereon a group of electrodes for liquid crystal drive, and a layer of ferroelectric liquid crystal disposed between the substrates, wherein thermosetting adhesive particles and thermoplastic polymer particles having a glass transition temperature of at most -20° C. are dispersed and pressed between the substrates.
Claim 8
Dependent Claim
15 words
A device according to claim 5, wherein said polymer particles are in an encapsulated form.
Claim 9
Dependent Claim
31 words
A device according to claim 5, wherein said polymer particles and thermosetting adhesive particles respectively have a diameter which is 1.5-5 times the liquid crystal layer thickness disposed between the substrates.
Claim 10
Dependent Claim
44 words
A device according to claim 5, wherein said ferroelectric liquid crystal is placed in a uniform alignment state satisfying a relationship of H>θ1>H/2, wherein H denotes a half of cone angle and θa denotes an apparent tilt angle, respectively, of the ferroelectric liquid crystal.
Claim 11
Dependent Claim
26 words
A device according to claim 5, wherein said polymer particles and adhesive particles are respectively dispersed at a rate of at least 40 particles/mm 2 .
Claim 12
Dependent Claim
38 words
A device according to claim 5, wherein said polymer particles comprise at least one material selected from the group consisting of high-density polyethylene, low-density polyethylene, acrylic urethane resin, acrylic resin containing butyl rubber, nylon, and silicone rubber resin.
Claim 13
Dependent Claim
15 words
A device according to claim 6, wherein said polymer particles are encapsulated with polymethyl methacrylate.
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