US3914019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display arrangements
Assignee: BAE Systems Electronics Ltd
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Filing: 1974-02-19
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Granted: 1975-10-21
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Expires: 1994-02-19
Abstract
Abstract A liquid crystal display arrangement comprising two electrodes separated by liquid crystal material, at least one of which has a pattern formed over a display area to provide a desired display and wherein there is provided on the side of the pattern electrode remote from the liquid crystal material a further electrode which extends continuously over the display area and which is electrically isolated from the pattern electrode.
Inventors
- 👤 Dennis William George Byatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:17
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134336
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
185 words
A liquid crystal display cell comprising not more than one layer of liquid crystal material and which material is of the storage type; two electrodes arranged one on each side of the liquid crystal material, at least one of which two electrodes is a pattern electrode which contacts and incompletely covers one side of the liquid crystal material so as to provide a desired display and to leave the remainder of said one side uncovered by said pattern electrode and the other of which two electrodes is in contact with said layer; a further electrode and an insulating layer disposed between and in contact with said pattern and said further electrode, which further electrode at least covers said remainder of said one side of the liquid crystal material; and conductor means connected to each of said two and said further electrode and extending therefrom for external connection whereby signals may be applied respectively for clearing an initial cloudiness in the liquid crystal material, for generating localized cloudiness according to the pattern of said pattern electrode and for erasing localized cloudiness according to the pattern generated.
Claim 2
Dependent Claim
185 words
A liquid crystal display cell comprising not more than one layer of liquid crystal material and which material is of the storage type; two electrodes arranged one on each side of the liquid crystal material, at least one of which two electrodes is a pattern electrode which contacts and incompletely covers one side of the liquid crystal material so as to provide a desired display and to leave the remainder of said one side uncovered by said pattern electrode and the other of which two electrodes is in contact with said layer; a further electrode and an insulating layer disposed between and in contact with said pattern and said further electrode, which further electrode at least covers said remainder of said one side of the liquid crystal material; and conductor means connected to each of said two and said further electrode and extending therefrom for external connection whereby signals may be applied respectively for clearing an initial cloudiness in the liquid crystal material, for generating localized cloudiness according to the pattern of said pattern electrode and for erasing localized cloudiness according to the pattern generated.
Claim 3
Dependent Claim
84 words
A liquid crystal display cell as claimed in claim 1 wherein each of said two electrodes is a pattern electrode and wherein a respective further electrode overlies each of said pattern electrodes, one further electrode extending continuously over the display area at least in regions not covered by solid portions of the first of said pattern electrodes and the second further electrode extending continuously over the display area at least in regions not covered by solid portions of the second of said pattern electrodes.
Claim 4
Dependent Claim
39 words
A liquid crystal display cell as claimed in cLaim 2 wherein one of said pattern electrodes consists of a plurality of individually selectable conductors in crossing relationship with a plurality of individually selectable conductors forming the second pattern electrode.
Claim 5
Dependent Claim
25 words
A liquid crystal display cell as claimed in claim 1 and wherein said further electrode completely covers said one side of said liquid crystal material.
Claim 6
Dependent Claim
29 words
A liquid crystal display cell as claimed in claim 1 and wherein said liquid crystal material is a mixture of nematic liquid crystal material and cholesteric liquid crystal material.
Claim 7
Dependent Claim
156 words
In a liquid crystal display arrangement in combination: a layer of liquid crystal material which may be altered between different light transmissive states; first electrode means disposed on one side of and completely covering said layer and second electrode means disposed on the other side of and completely covering said layer, said first electrode means including a pattern electrode which incompletely covers said layer, a further electrode spaced from said pattern electrode, and insulating means separating said pattern electrode and said further electrode; first signal generating means connected between said first electrode means and said second electrode means, for applying a voltage across the entirety of said liquid crystal material initially to condition it to a non-displaying light transmissive state; and second signal generating means connected to said pattern electrode and to said second electrode means for locally applying a voltage across said liquid crystal material to condition it locally to a displaying liquid transmissive state.
Claim 8
Dependent Claim
156 words
In a liquid crystal display arrangement in combination: a layer of liquid crystal material which may be altered between different light transmissive states; first electrode means disposed on one side of and completely covering said layer and second electrode means disposed on the other side of and completely covering said layer, said first electrode means including a pattern electrode which incompletely covers said layer, a further electrode spaced from said pattern electrode, and insulating means separating said pattern electrode and said further electrode; first signal generating means connected between said first electrode means and said second electrode means, for applying a voltage across the entirety of said liquid crystal material initially to condition it to a non-displaying light transmissive state; and second signal generating means connected to said pattern electrode and to said second electrode means for locally applying a voltage across said liquid crystal material to condition it locally to a displaying liquid transmissive state.
Claim 9
Dependent Claim
55 words
In an arrangement as recited in claim 6 wherein said further electrode within said first electrode means covers the entirety of said liquid crystal material and said first signal generating means is connected between said first and second electrode means so as to create a potential between said further electrode and said second electrode means.
Claim 10
Dependent Claim
51 words
In an arrangement as recited in claim 6 wherein said second electrode means includes a second pattern electrode which incompletely covers said layer of liquid crystal material and a second further electrode spaced from said second pattern electrode, and insulating means separating said second pattern electrode and said second further electrode.
Claim 11
Dependent Claim
57 words
In an arrangement as recited in claim 8 wherein said second further electrode within said second electrode means covers the entirety of said liquid crystal material and said first signal generating means is connected between said first and second electrode means so as to create a potential between said second further electrode and said first electrode means.
Claim 12
Dependent Claim
47 words
In an arrangement as recited in claim 8 wherein said first pattern electrode and said second pattern electrodes are formed by a plurality of individually selectable conductors, the conductors of said first pattern electrode being in a crossing relationship with the conductors of said second pattern electrode.
Claim 13
Dependent Claim
36 words
In an arrangement as recited in claim 6 and wherein said liquid crystal material is one in which the change in light transmissive characteristics achieved by passing a current therethrough remains after said current is removed.
Claim 14
Dependent Claim
27 words
In an arrangement as recited in claim 11 and wherein said liquid crystal material is a mixture of nematic liquid crystal material and cholesteric liquid crystal material.
Claim 15
Dependent Claim
23 words
In an arrangement as recited in claim 6 wherein said pattern electrode, said further electrode and said insulating means are transparent in nature.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |