US4037927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display screen with multiple electrode arrangement
Assignee: Siemens AG
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Filing: 1975-01-21
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Granted: 1977-07-26
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Expires: 1995-01-21
Abstract
Abstract A liquid crystal display screen having a liquid crystal layer disposed between a pair of carrier plates to form a liquid crystal cell characterized in a plurality of electrode layers disposed between the carrier plates with adjacent electrode layers being separated by an insulating layer and selected electrode layers being in the shape of characters or digits and being energized to form displays of different characters or digits. In one embodiment, a digit electrode layer is applied on opposite faces of the liquid crystal layer and a continuous electrode is separated by an insulating layer from each of the additional electrode layers. In a second embodiment, the liquid crystal layer is disposed between a continuous electrode layer and more than two digit electrode layers with the outermost digit electrode layer being continuous whereas the inner digit electrodes have interrupted conducting surfaces. In the third embodiment, a color filter such as a three-color triplet having the colors arranged in strips is disposed between the carrier plates, the continuous electrode is formed by three electrode layers separated by insulating layers with each layer having strips of electrodes overlying the strips of a specific color so by selecting the energizing of various electrodes, a character of one color can be produced.
Inventors
- 👤 Hans Krueger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:44
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/1335; G02F1/133509; G02F1/133514; G09; G09F; G09F9/00; G09F9/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
In a liquid crystal display screen which may be operated to separately display in time sequence at least two digits, said screen comprising a liquid crystal cell having two transparent carrier plates with a liquid crystal layer disposed therebetween, the improvement comprising a continuous, transparent electrical conductive layer disposed adjacent one of the two carrier plates and having a shape of a first digit and being provided with an electrical lead; at least one additional digit panel positioned between the layer forming the first digit and the liquid crystal layer, each of said additional digit panels having an interrupted electrical conducting layer in the form of a plurality of parallel strips delimiting an additional digit with said strips being interconnected to a single electrical lead and the strips of each additional digit panel extending in different directions, an insulating layer disposed between adjacent conductive layers, and electrical conducting electrode layer adjoining the other of said two carrier plates with the liquid crystal layer between the electrode layer and the digit panels so that a selected application of a potential on the electrode layer and a conductive layer of the digit creates an indication of the selected digit in the liquid crystal layer.
Claim 2
Dependent Claim
202 words
In a liquid crystal display screen which may be operated to separately display in time sequence at least two digits, said screen comprising a liquid crystal cell having two transparent carrier plates with a liquid crystal layer disposed therebetween, the improvement comprising a continuous, transparent electrical conductive layer disposed adjacent one of the two carrier plates and having a shape of a first digit and being provided with an electrical lead; at least one additional digit panel positioned between the layer forming the first digit and the liquid crystal layer, each of said additional digit panels having an interrupted electrical conducting layer in the form of a plurality of parallel strips delimiting an additional digit with said strips being interconnected to a single electrical lead and the strips of each additional digit panel extending in different directions, an insulating layer disposed between adjacent conductive layers, and electrical conducting electrode layer adjoining the other of said two carrier plates with the liquid crystal layer between the electrode layer and the digit panels so that a selected application of a potential on the electrode layer and a conductive layer of the digit creates an indication of the selected digit in the liquid crystal layer.
Claim 3
Dependent Claim
24 words
In a liquid crystal display screen according to claim 1, which includes a pair of cross polarizers with the liquid crystal cell disposed therebetween.
Claim 4
Dependent Claim
114 words
In the liquid crystal display screen according to claim 1, wherein the cell includes a color strip layer with a plurality of successively red, green, blue color triplets disposed between the other carrier plate and the liquid crystal layer, and wherein the electrode layer is formed of three comb-like electrode strip layers, which are separated from one another by insulating layers and are disposed between the color strip layer and the liquid crystal layer with electrodes of each comb-like strip layer coinciding with all of the color strips of a separate one of the three colors of the color strip layer so that a colored display of each of the digits can be obtained.
Claim 5
Dependent Claim
24 words
In a liquid crystal display screen according to claim 3, which includes a pair of cross polarizers with the liquid crystal cell disposed therebetween.
Claim 6
Dependent Claim
230 words
In a liquid crystal display screen which may be operated to separately display in time sequence at least two digits, said screen comprising a liquid crystal cell having two transparent carrier plates with a liquid crystal layer disposed therebetween, the improvement comprising a continuous, transparent electrical conductive layer disposed adjacent one of the two carrier plates and having the shape of a first digit, said layer being provided with an electrical lead, at least one additional digit panel having an electrical conducting layer having an electrical lead and delimiting a second digit, each of said additional digit panels being positioned between the layer forming the first digit and the liquid crystal layer with an insulating layer disposed between adjacent conductive layers, a color strip layer with a plurality of successive red-green-blue color strip triplets disposed in the cell adjacent the other of the two carrier plates, three comb-like electrode strip layers disposed between the color strip layer and the liquid crystal layer with an insulating layer disposed between adjacent electrode strip layers, said electrode strip layer being arranged so that the comb-like electrodes of each electrode strip layer coincides with all of the colored strips of a separate one of the three colors of the color strip layer so that by selectively energizing selected electrode strip layers and a selected digit layer a colored presentation of the digit will occur.
Claim 7
Dependent Claim
230 words
In a liquid crystal display screen which may be operated to separately display in time sequence at least two digits, said screen comprising a liquid crystal cell having two transparent carrier plates with a liquid crystal layer disposed therebetween, the improvement comprising a continuous, transparent electrical conductive layer disposed adjacent one of the two carrier plates and having the shape of a first digit, said layer being provided with an electrical lead, at least one additional digit panel having an electrical conducting layer having an electrical lead and delimiting a second digit, each of said additional digit panels being positioned between the layer forming the first digit and the liquid crystal layer with an insulating layer disposed between adjacent conductive layers, a color strip layer with a plurality of successive red-green-blue color strip triplets disposed in the cell adjacent the other of the two carrier plates, three comb-like electrode strip layers disposed between the color strip layer and the liquid crystal layer with an insulating layer disposed between adjacent electrode strip layers, said electrode strip layer being arranged so that the comb-like electrodes of each electrode strip layer coincides with all of the colored strips of a separate one of the three colors of the color strip layer so that by selectively energizing selected electrode strip layers and a selected digit layer a colored presentation of the digit will occur.
Claim 8
Dependent Claim
24 words
In a liquid crystal display screen according to claim 5, which includes a pair of cross polarizers with the liquid crystal cell disposed therebetween.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |