EP0208293A1
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EP
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A ferroelectric liquid crystal element and a method for manufacturing the same
Assignee: Hitachi Ltd
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Filing: 1986-07-08
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Granted: —
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Expires: 2006-07-08
Abstract
Abstract The element comprises a pair of transparent substrates, a pair of light-transmitting electrodes each provided on the respective substrates, a ferroelectric liquid crystal layer disposed between the pair of substrates and orientation control films for the molecules of the ferroelectric liquid crystal provided between the electrodes and the ferroelectric liquid crystal layer. The orientation control film controls a tilt angle of a biphenyle series nematic liquid crystal having biphenyl ring system below 1.5° and causes a uniform molecule orientation characteristic and a memory property for the ferroelectric liquid crystal element of smectic C<sup>*</sup> liquid crystal and having a liquid crystal layer thickness of even more than 4 µ m.
Inventors
- 👤 Hisao Yokokura
- 👤 Katsumi Kondo
- 👤 Yasuo Hanawa
- 👤 Susumu Era
- 👤 Kishiro Iwasaki
- 👤 Tadao Nakata
- 👤 Masato Isogain
- 👤 Teruo Kitamura
- 👤 Akio Mukoh
- 👤 Yasuhiko Kando
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:46
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133345; G02F1/1337; G02F1/133711; G02F1/137; G02F1/139; G02F1/141; C; C09; C09K; C09K2323/00; C09K2323/05
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
73 words
A ferroelectric liquid crystal element comprising a pair of substrates at least one of which is transparent and is provided with a light-transmitting electrode and a ferroelectric liquid crystal layer disposed between said pair of substrates characterized in that an orientation control film controlling an orientation tilt angle of a nematic liquid crystal having biphenyl ring system below 1.5° is provided at least one between said electrodes and said ferroelectric liquid crystal layer.
Claim 2
Dependent Claim
73 words
A ferroelectric liquid crystal element comprising a pair of substrates at least one of which is transparent and is provided with a light-transmitting electrode and a ferroelectric liquid crystal layer disposed between said pair of substrates characterized in that an orientation control film controlling an orientation tilt angle of a nematic liquid crystal having biphenyl ring system below 1.5° is provided at least one between said electrodes and said ferroelectric liquid crystal layer.
Claim 3
Dependent Claim
26 words
A ferroelectric liquid crystal element defined in claim 1 further characterized in that said orientation control film essentially consists of a polymer containing S0 2 .
Claim 4
Dependent Claim
38 words
A ferroelectric liquid crystal element defined in claim 2 further characterized in that said polymer containing S0 2 is a polymer of imide series, imide siloxane series, imido-isoindol-quinazoline-dion series, hydrazide imide series, amide series or amide imide series.
Claim 5
Dependent Claim
30 words
A ferroelectric liquid crystal element defined in claim 2 further characterized in that said orientation control film of said polymer containing S0 2 is provided through an inorganic insulating layer.
Claim 6
Dependent Claim
31 words
A ferroelectric liquid crystal element defined in claim 3 further characterized in that said orientation control film of said polymer containing S0 2 is provided through an in organic insulating layer.
Claim 7
Dependent Claim
27 words
6 . A ferroelectric liquid crystal element defined in claim 2 further characterized in that said polymer containing S0 2 contains a coupling agent of silane series.
Claim 8
Dependent Claim
29 words
A ferroelectric liquid crystal element defined in claim 4 further characterized in that said inorganic insulating layer contains at least one of silicon dioxide, aluminum oxide and titanium dioxide.
Claim 9
Dependent Claim
29 words
A ferroelectric liquid crystal element defined in claim 5 further characterized in that said inorganic insulating layer contains at least one of silicon dioxide, aluminum oxide and titanium dioxide.
Claim 10
Dependent Claim
42 words
A ferroelectric liquid crystal element comprising a ferroelectric liquid crystal disposed between a pair of substrates at least one of which is transparent and is provided with a light-transmitting electrode wherein the gap between said pair of substrates is at least 4pm.
Claim 11
Dependent Claim
42 words
A ferroelectric liquid crystal element comprising a ferroelectric liquid crystal disposed between a pair of substrates at least one of which is transparent and is provided with a light-transmitting electrode wherein the gap between said pair of substrates is at least 4pm.
Claim 12
Dependent Claim
36 words
A ferroelectric liquid crystal element defined in claim 9 further characterized in that an orientation control film of a polymer containing S0 2 is provided at least one between said electrodes and the ferroelectric liquid crystal.
Claim 13
Dependent Claim
45 words
A ferroelectric liquid crystal element defined in claim 10 further characterized in that said ferroelectric liquid crystal is one which exhibits isotropic phase → cholesteric phase + smectic C * phase or isotropic phase + smetic C * phase starting from a high temperature side.
Claim 14
Dependent Claim
38 words
A ferroelectric liquid crystal element defined in claim 10 further characterzed in that said polymer containing S0 2 is a polymer of imide series, imide siloxane series, imido-isoindol-quinazoline-dion series, hydrazide imide series, amide series or amide imide series.
Claim 15
Dependent Claim
39 words
A ferroelectric liquid liqid crystal element defined in claim 11 further characterized in that said polymer containing S0 2 is a polymer of imide series, imide siloxane series, imido-isoindol-quinazoline-dion series, hydrazide imide series, amide series or amide imide series.
Claim 16
Dependent Claim
37 words
A ferrelectric liquid crystal element defined in claim 12 further characterized in that an inorganic insulating film is provided between said orientation control layer of said polymer containing S0 2 and said substrate with the light-transmitting electrode.
Claim 17
Dependent Claim
38 words
A ferroelectric liquid crystal element defined in claim 13 further characterized in that an inorganic insulating layer is provided between said orientation control film of said polymer containing S0 2 and said substrate with the light transmitting electrode.
Claim 18
Independent Claim
129 words
A method for manufacturing a ferroelectric liquid crystal element comprising a pair of substrates at least one of which is transparent and is provided with a light-transmitting electrode and a ferroelectric liquid crystal disposed between said pair of substrates, characterized in that applying a polyamic acid and/or polyamic hydrazide varnish obtained by reacting diamine or dihydrazide with S0 2 radical with tetracarboxylic dianhydr ide or di-, tri- or tetracarboxylic halide to at least one between said electrodes and said ferroelectric liquid crystal; forming a thin film of a polymer containing S0 2 by heating said varnish at a temperature which permits ring closure of said varnish and forming an orientation control film for said ferroelectric liquid crystal by rubbing the surface of the thin film in a predetermined direction.
Claim 19
Independent Claim
129 words
A method for manufacturing a ferroelectric liquid crystal element comprising a pair of substrates at least one of which is transparent and is provided with a light-transmitting electrode and a ferroelectric liquid crystal disposed between said pair of substrates, characterized in that applying a polyamic acid and/or polyamic hydrazide varnish obtained by reacting diamine or dihydrazide with S0 2 radical with tetracarboxylic dianhydr ide or di-, tri- or tetracarboxylic halide to at least one between said electrodes and said ferroelectric liquid crystal; forming a thin film of a polymer containing S0 2 by heating said varnish at a temperature which permits ring closure of said varnish and forming an orientation control film for said ferroelectric liquid crystal by rubbing the surface of the thin film in a predetermined direction.
Claim 20
Dependent Claim
55 words
A method for manufacturing the ferroelectric liquid crystal element defined in claim 16 further characterized in that forming an inorganic insulating layer on the substrate with the light-transmitting electrode; applying said varnish of polyamic acid containing S0 2 and/or polyamic hydrazide containing S0 2 on the inorganic insulating layer; and ring-closing said varnish by heating.
Claim 21
Dependent Claim
33 words
A method for manufacturing the ferroelectric liquid crystal element defined in claim 17 further characterised in that said inorganic insulating layer contains at least one of silicon dioxide, aluminum oxide and titanium dioxide.
Claim 22
Dependent Claim
104 words
A ferroelectric liquid crystal element characterized in that comprising a light-transmitting electrode provided to a pair of substrates at least one of which is transparent, a light tranmitting insulating layer covering said light transmitting electrodes, an orientation control film of a polymer of imide series, . imide siloxane series, imide-isoindol-quinazoline-dion series, hydrazide imide series, amide series, or amide imide series each containing S0 2 in its skeletal structure provided on said light transmitting insulating layer, a spacer disposed between the substrates capable of freely controlling the intersubstrate gap and a ferroelectric liquid crystal disposed between said substrates, periphery of which is air tightly sealed.
Claim 23
Dependent Claim
104 words
A ferroelectric liquid crystal element characterized in that comprising a light-transmitting electrode provided to a pair of substrates at least one of which is transparent, a light tranmitting insulating layer covering said light transmitting electrodes, an orientation control film of a polymer of imide series, . imide siloxane series, imide-isoindol-quinazoline-dion series, hydrazide imide series, amide series, or amide imide series each containing S0 2 in its skeletal structure provided on said light transmitting insulating layer, a spacer disposed between the substrates capable of freely controlling the intersubstrate gap and a ferroelectric liquid crystal disposed between said substrates, periphery of which is air tightly sealed.
Claim 24
Dependent Claim
41 words
A ferroelectric liquid crystal element defined in claim 19 further characterized in that said ferroelectric liquid crystal exhibits isotropic phase cholesteric phase → smectic C * phase or isotropic phase → smectric C * phase starting from a high temperature side.
Claim 25
Dependent Claim
23 words
2 1. A ferroelectric liquid crystal element defined in claim 20 further characterized in that said. ferroelectric liquid crystal contains a dichroic dye.
References Cited (Backward Citations)
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