US4838653A
Expired / Lapsed
US
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Liquid crystal display with particular relationship of the capacitances
Assignee: Raychem Corp
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Filing: 1986-07-22
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Granted: 1989-06-13
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Expires: 2006-07-22
Abstract
Abstract PCT No. PCT/US87/01756 Sec. 371 Date Mar. 18, 1988 Sec. 102(e) Date Mar. 18, 1988 PCT Filed Jul. 22, 1986 PCT Pub. No. WO88/00717 PCT Pub. Date Jan. 28, 1988.A display comprises an array of a plurality of liquid crystal elements electrically connected in series. The element with the lowest capacitance when energized comprises a liquid crystal material having a positive dielectric anisotropy so that it has a higher capacitance when energized than when non-energized. A second of the elements has a capacitance when non-energized lower than the capacitance of the first element when it is energized. The display can be used for detecting a voltage or an electric field.
Inventors
- 👤 Manoochehr Mohebban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:58
CPC Classifications
G; G01; G01R; G01R15/00; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06777; G01R15/14; G01R15/24; G01R15/245; G01R29/00; G01R29/12; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/13306; G02F1/1333; G02F1/1343; G02F1/134309
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A liquid crystal display comprising an array of a plurality of liquid crystal elements, said array comprising: (a) a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other of said liquid crystal elements and comprising a liquid crystal material having a positive dielectric anisotropy so that said liquid crystal element has a capacitance in the energized state higher than its capacitance in the nonenergized state; and (b) a second liquid crystal element connected electrically in series with said first liquid crystal element, said second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state.
Claim 2
Dependent Claim
117 words
A liquid crystal display comprising an array of a plurality of liquid crystal elements, said array comprising: (a) a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other of said liquid crystal elements and comprising a liquid crystal material having a positive dielectric anisotropy so that said liquid crystal element has a capacitance in the energized state higher than its capacitance in the nonenergized state; and (b) a second liquid crystal element connected electrically in series with said first liquid crystal element, said second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state.
Claim 3
Dependent Claim
26 words
A liquid crystal display in accordance with claim 1, comprising an array of at least five liquid crystal elements, the elements being electrically connected in series.
Claim 4
Dependent Claim
22 words
A display in accordance with claim 2, wherein the liquid crystal elements comprise a liquid crystal material having a positive dielectric anisotropy.
Claim 5
Dependent Claim
16 words
A display in accordance with claim 3, wherein the liquid crystal material is smectic or nematic.
Claim 6
Dependent Claim
18 words
A display in accordance with claim 4, wherein the liquid crystal material is an encapsulated liquid crystal material.
Claim 7
Dependent Claim
18 words
A display in accordance with claim 2, wherein the liquid crystal elements are of substantially the same size.
Claim 8
Dependent Claim
34 words
A liquid crystal device comprising a plurality of liquid crystal arrays in accordance with claim 1, at least one of said arrays being connected in parallel to at least one other of said arrays.
Claim 9
Independent Claim
212 words
A method of making a display comprising an array of a plurality of liquid crystal elements connected in series, said method comprising: (a) providing first and second support members; (b) providing said first support member with electrodes in a first predetermined pattern; (c) providing said second support member with electrodes in a second predetermined pattern, said first and second patterns being such that when the support members are superimposed and aligned, the electrodes of said first support member partially overlap the electrodes of said second support member providing areas of overlap; (d) positioning a layer of liquid crystal material having a positive dielectric anisotropy between said first and second support members; (e) superimposing and aligning said support members such that their respective electrodes are facing said liquid crystal layer and the overlap areas of the electrodes with liquid crystal material therebetween form a plurality of liquid crystal elements connected in series by overlapping electrodes, said array having a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other liquid crystal element and a second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state; and (f) laminating the resulting structure.
Claim 10
Independent Claim
212 words
A method of making a display comprising an array of a plurality of liquid crystal elements connected in series, said method comprising: (a) providing first and second support members; (b) providing said first support member with electrodes in a first predetermined pattern; (c) providing said second support member with electrodes in a second predetermined pattern, said first and second patterns being such that when the support members are superimposed and aligned, the electrodes of said first support member partially overlap the electrodes of said second support member providing areas of overlap; (d) positioning a layer of liquid crystal material having a positive dielectric anisotropy between said first and second support members; (e) superimposing and aligning said support members such that their respective electrodes are facing said liquid crystal layer and the overlap areas of the electrodes with liquid crystal material therebetween form a plurality of liquid crystal elements connected in series by overlapping electrodes, said array having a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other liquid crystal element and a second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state; and (f) laminating the resulting structure.
Claim 11
Independent Claim
150 words
A method of detecting the presence of an electric field in a given area, comprising positioning a liquid crystal display in said area and observing the optical state of said liquid crystal display; said liquid crystal display comprising an array of a plurality of liquid crystal elements, said array comprising: (a) a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other of said liquid crystal elements and comprising a liquid crystal material having a positive dielectric anisotropy so that said liquid crystal element has a capacitance in the energized state higher than its capacitance in the non-energized state; and (b) a second liquid crystal element connected electrically in series with said first liquid crystal element, said second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state.
Claim 12
Independent Claim
150 words
A method of detecting the presence of an electric field in a given area, comprising positioning a liquid crystal display in said area and observing the optical state of said liquid crystal display; said liquid crystal display comprising an array of a plurality of liquid crystal elements, said array comprising: (a) a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other of said liquid crystal elements and comprising a liquid crystal material having a positive dielectric anisotropy so that said liquid crystal element has a capacitance in the energized state higher than its capacitance in the non-energized state; and (b) a second liquid crystal element connected electrically in series with said first liquid crystal element, said second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state.
Claim 13
Independent Claim
134 words
A method of detecting a voltage which comprises ohmically connecting at least one lead of a voltage source to a display comprising an array of a plurality of liquid crystal elements, said array comprising: (a) a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other of said liquid crystal elements and comprising a liquid crystal material having a positive dielectric anisotropy so that said liquid crystal element has a capacitance in the energized state higher than its capacitance in the non-energized state; and (b) a second liquid crystal element connected electrically in series with said first liquid crystal element, said second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state.
Claim 14
Independent Claim
134 words
A method of detecting a voltage which comprises ohmically connecting at least one lead of a voltage source to a display comprising an array of a plurality of liquid crystal elements, said array comprising: (a) a first liquid crystal element having a capacitance in the non-energized state lower than the capacitance of any other of said liquid crystal elements and comprising a liquid crystal material having a positive dielectric anisotropy so that said liquid crystal element has a capacitance in the energized state higher than its capacitance in the non-energized state; and (b) a second liquid crystal element connected electrically in series with said first liquid crystal element, said second liquid crystal element having a capacitance in the non-energized state lower than the capacitance of the first liquid crystal element in its energized state.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |