US4256377A
Expired / Lapsed
US
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Process for producing homeotropic orientation layers for liquid crystal devices and the resultant liquid crystal devices
Assignee: Siemens AG
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Filing: 1978-05-18
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Granted: 1981-03-17
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Expires: 1998-05-18
Abstract
Abstract A homeotropic orientation layer for a liquid crystal cell is produced by forming an organic liquid solution containing a suitable amount of Si and Me to provide a necessary ratio of such elements to correspond to a chemical composition defined by the formula: (Me.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein Me is an element selected from the group consisting of Al and Cr, x is a numeral at least equal to 0 and smaller than 1, and y is a numeral at least equal to 1.9 and not more than 2; applying a layer of such organic solution onto at least one face of a liquid crystal cell substrate, which may have a conductive layer thereon, and transferring such layer of organic solution into a solid homeotropically orientating layer by thermal decomposition of the organic solution, as by heating the solution-coated substrate at a temperature in the range of about 100° to 550° C. for a period of time ranging from about 10 to 30 minutes.
Inventors
- 👤 Hans Krueger
- 👤 Hans Pink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:52
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133719; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
134 words
A process of producing a homeotropically orientating layer on a liquid crystal cell substrate, comprising: forming an organic liquid solution containing a suitable amount of Si and Me to provide a necessary ratio of such materials to form an orientatiion layer having a chemical composition defined by the formula: (Me.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein Me is an element selected from the group consisting of Al and Cr, x is a numeral greater than 0 and smaller than 1, and y is a numeral at least equal to 1.9 and not more than 2; applying a layer of said organic solution onto at least one face of a liquid crystal cell substrate; and transforming said layer of organic solution into a solid homeotropically orientating layer having said chemical composition by thermal decomposition of said organic solution.
Claim 2
Dependent Claim
134 words
A process of producing a homeotropically orientating layer on a liquid crystal cell substrate, comprising: forming an organic liquid solution containing a suitable amount of Si and Me to provide a necessary ratio of such materials to form an orientatiion layer having a chemical composition defined by the formula: (Me.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein Me is an element selected from the group consisting of Al and Cr, x is a numeral greater than 0 and smaller than 1, and y is a numeral at least equal to 1.9 and not more than 2; applying a layer of said organic solution onto at least one face of a liquid crystal cell substrate; and transforming said layer of organic solution into a solid homeotropically orientating layer having said chemical composition by thermal decomposition of said organic solution.
Claim 3
Dependent Claim
31 words
A process as defined in claim 1 wherein applying said layer of organic solution to said substrate face is accomplished by submerging at least said substrate face into said organic solution.
Claim 4
Dependent Claim
28 words
A process as defined in claim 1 wherein applying said layer of organic solution to said substrate face is accomplished by spraying said solution onto said substrate face.
Claim 5
Dependent Claim
27 words
A process as defined in claim 1 wherein said substrate face, prior to said layer of organic solution being applied thereto, is provided with a conductive layer.
Claim 6
Dependent Claim
47 words
A process as defined in claim 1 wherein said organic solution contains a solvent for Si and Me, said solvent being selected from the group consisting of relatively low molecular weight monocarboxylic acids, relatively low molecular weight alcohols, esters of such acids and alcohols and mixtures thereof.
Claim 7
Dependent Claim
32 words
A process as defined in claim 5 wherein said relatively low molecular weight monocarboxylic acids and relatively low molecular weight alcohols are comprised of C 1 to C 4 alcohols and acids.
Claim 8
Dependent Claim
23 words
A process as defined in claim 1 wherein said organic solution contains relatively low molecular weight monocarboxylic acid compounds of Si and Me.
Claim 9
Dependent Claim
32 words
A process as defined in claim 7 wherein said relatively low molecular weight monocarboxylic acids and relatively low molecular weight alcohols are comprised of C 1 to C 4 alcohols and acids.
Claim 10
Dependent Claim
32 words
A process as defined in claim 1 wherein said organic solution contains Si and Me metal halides whose anions are at least partially substituted by relatively low molecular weight monocarboxylic acid radicals.
Claim 11
Dependent Claim
32 words
A process as defined in claim 9 wherein said relatively low molecular weight monocarboxylic acids and relatively low molecular weight alcohols are comprised of C 1 to C 4 alcohols and acids.
Claim 12
Dependent Claim
51 words
A process as defined in claim 1 wherein said organic solution contains Si and Me metal halides whose anions are at least partially substituted by materials selected from the group consisting of (a) relatively low molecular weight monocarboxylic acid radicals and hydroxy radicals and (b) relatively low molecular weight alcohol radicals.
Claim 13
Dependent Claim
32 words
A process as defined in claim 11 wherein said relatively low molecular weight monocarboxylic acids and relatively low molecular weight alcohols are comprised of C 1 to C 4 alcohols and acids.
Claim 14
Dependent Claim
20 words
A process as defined in claim 1 wherein x is a numeral greater than 0 and not more than 0.8.
Claim 15
Dependent Claim
20 words
A process as defined in claim 1 wherein x is a numeral greater than 0 and not more than 0.5.
Claim 16
Dependent Claim
21 words
A process as defined in claim 1 wherein x is a numeral at least equal to 0.9 but less than 1.
Claim 17
Dependent Claim
33 words
A process as defined in claim 1 wherein said transforming said organic solution layer into said orientation layer includes heating said solution layer at a temperature ranging from about 100° to 550° C.
Claim 18
Dependent Claim
29 words
A process as defined in claim 1 wherein said orientation layer is composed of a mixture of SiO 2 and about 7 weight percent Al 2 O 3 .
Claim 19
Dependent Claim
21 words
A homeotropically orientating layer produced via the process defined in claim 1 and positioned within an operable liquid crystal display device.
Claim 20
Dependent Claim
99 words
In an operational liquid crystal display device having a pair of spaced carrier plates with inner surfaces thereof forming a cavity, at least one of said inner surfaces having a conductive coating thereon and a liquid crystal within said cavity, the improvement comprising wherein: a homeotropically orientating layer is positioned on at least said conductive coating, said orientating layer consisting essentially of a chemical composition defined by the formula: (Al.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein x is a numeral greater than 0 and less than 1, and y is a numeral at least equal to 1.9 and not greater than 2.
Claim 21
Dependent Claim
99 words
In an operational liquid crystal display device having a pair of spaced carrier plates with inner surfaces thereof forming a cavity, at least one of said inner surfaces having a conductive coating thereon and a liquid crystal within said cavity, the improvement comprising wherein: a homeotropically orientating layer is positioned on at least said conductive coating, said orientating layer consisting essentially of a chemical composition defined by the formula: (Al.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein x is a numeral greater than 0 and less than 1, and y is a numeral at least equal to 1.9 and not greater than 2.
Claim 22
Dependent Claim
98 words
In an operational liquid crystal display device having a pair of spaced carrier plates with inner surfaces thereof forming a cavity, at least one said inner surfaces having a conductive coating thereon and a liquid crystal within said cavity, the improvement comprising wherein: a hometropically orientating layer is positioned on at least said conductive coating, said orientating layer consisting essentially of a chemical composition defined by the formula: (Cr.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein x is a numeral greater than 0 and less than 1, and y is a numeral at least equal to 1.9 and not greater than 2.
Claim 23
Dependent Claim
98 words
In an operational liquid crystal display device having a pair of spaced carrier plates with inner surfaces thereof forming a cavity, at least one said inner surfaces having a conductive coating thereon and a liquid crystal within said cavity, the improvement comprising wherein: a hometropically orientating layer is positioned on at least said conductive coating, said orientating layer consisting essentially of a chemical composition defined by the formula: (Cr.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein x is a numeral greater than 0 and less than 1, and y is a numeral at least equal to 1.9 and not greater than 2.
Claim 24
Dependent Claim
112 words
In an operational liquid crystal display device having a pair of spaced carrier plates with inner surfaces thereof forming a cavity, at least one of said inner surfaces having a conductive coating thereon and a liquid crystal within said cavity, the improvement comprising wherein: a homeotropically orientating layer is positioned on at least said conductive coating, said orientating layer consisting essentially of a chemical composition defined by the formula: (Me.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein Me is an element selected from the group consisting of Al and Cr, x is a numeral greater than 0 and less than 1, and y is a numeral at least equal to 1.9 and not greater than 2.
Claim 25
Dependent Claim
112 words
In an operational liquid crystal display device having a pair of spaced carrier plates with inner surfaces thereof forming a cavity, at least one of said inner surfaces having a conductive coating thereon and a liquid crystal within said cavity, the improvement comprising wherein: a homeotropically orientating layer is positioned on at least said conductive coating, said orientating layer consisting essentially of a chemical composition defined by the formula: (Me.sub.2 O.sub.3).sub.1-x (SiO.sub.y).sub.x wherein Me is an element selected from the group consisting of Al and Cr, x is a numeral greater than 0 and less than 1, and y is a numeral at least equal to 1.9 and not greater than 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |