US3864022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color switching liquid crystal display
Assignee: Panasonic Holdings Corp
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Filing: 1973-12-18
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Granted: 1975-02-04
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Expires: 1993-12-18
Abstract
Abstract A color switching liquid crystal display consisting of a nematic liquid crystal which exhibits a homeotropic arrangement and having a negative dielectric anisotropy, and a combination of dyes of different display action characteristic mixed in the liquid crystal, thereby various color display being made possible by changing-over the display light through electronically controlling the liquid crystal. This device can eliminate the drawbacks of color shading or the weakness of colored light which are often the case with elements including only one kind of dye, and display an arbitrary color by the combination of dyes with different light absorption.
Inventors
- 👤 Akio Moriyama
- 👤 Masakazu Fukai
- 👤 Komei Asai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; C; C09; C09K; C09K19/00; C09K19/52; C09K19/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A COLOR SWITCHING LIQUID CRYSTAL DISPLAY COMPRISING: A LIQUID CRYSTAL ELEMENT FORMED OF A NEMATIC LIQUID CRYSTAL WHICH IN THE ABSENCE OF AN ELECTRIC FIELD EXHIBITS A HOMEOTROPIC ARRANGEMENT AND HAS A NEGATIVE DIELECTRIC ANISOTROPY, AND INCLUDING AT LEAST TWO KINDS OF DYES OF DIFFERNT LIGHT ABSORPTION AT LEAST ONE OF WHICH IS A PLEOCHROMATIC DYE, AND AT LEAST TWO OF WHICH EXHIBIT MUTUALLY DIFFERENT DISPLAY ACTION CHARACTERISTICS UNDER THE EFFECT OF AN ELECTRIC FIELD; AND MEANS FOR APPLYING AN ELECTRIC FIELD TO SAID LIQUID CRYSTAL ELEMENT.
Claim 2
Dependent Claim
87 words
A COLOR SWITCHING LIQUID CRYSTAL DISPLAY COMPRISING: A LIQUID CRYSTAL ELEMENT FORMED OF A NEMATIC LIQUID CRYSTAL WHICH IN THE ABSENCE OF AN ELECTRIC FIELD EXHIBITS A HOMEOTROPIC ARRANGEMENT AND HAS A NEGATIVE DIELECTRIC ANISOTROPY, AND INCLUDING AT LEAST TWO KINDS OF DYES OF DIFFERNT LIGHT ABSORPTION AT LEAST ONE OF WHICH IS A PLEOCHROMATIC DYE, AND AT LEAST TWO OF WHICH EXHIBIT MUTUALLY DIFFERENT DISPLAY ACTION CHARACTERISTICS UNDER THE EFFECT OF AN ELECTRIC FIELD; AND MEANS FOR APPLYING AN ELECTRIC FIELD TO SAID LIQUID CRYSTAL ELEMENT.
Claim 3
Dependent Claim
61 words
A color switching liquid crystal display according to claim 1, in which at least one kind of dye is a pleochromatic dye which changes from a colored state to a colorless state and at least one kind of dye among the rest of the dyes changes from a colorless state to a colored state by the application of an electric field.
Claim 4
Dependent Claim
64 words
A color switching liquid crystal display according to claim 1, in which at least one kind of dye is a pleochromatic dye which changes from a colored state to another colored state of different hue, and at least one kind of dye among the rest of the dyes changes from a colorless state to a colored state by the application of an electric field.
Claim 5
Dependent Claim
62 words
A color switching liquid crystal display according to claim 1, in which at least one kind is a pleochromatic dye which changes from a colored state to a colorless state and at least one kind of dye among the rest of the dyes changes from a colored state to another colored state of different hue by the application of an electric field.
Claim 6
Dependent Claim
60 words
A color switching liquid crystal display according to claim 1, in which at least one kind of dye is a pleochromatic dye which changes from a colored state to another colored state of different hue, and at least one kind of dye among the rest of the dyes changes from a colored state to another colored state of different hue.
Claim 7
Dependent Claim
57 words
A color switching liquid crystal display according to claim 1, in which at least one kind of dye is a pleochromatic dye which changes from a colored state to a colorless state, and at least one kind of dye among the rest of the dyes causes substantially no hue change by the application of an electric field.
Claim 8
Dependent Claim
60 words
A color switching liquid crystal display according to claim 1, in which at least one kind of dye is a pleochromatic dye which changes from a colored state to another colored state of different hue, and at least one kind of dye among the rest of the dyes causes substantially no hue change by the application of an electric field.
Claim 9
Dependent Claim
52 words
A color switching liquid crystal display according to claim 1, in which at least one kind of dye changes from a colorlEss state to a colored state and at least one kind of dye among the rest of the dyes causes substantially no hue change by the application of an electric field.
Claim 10
Dependent Claim
48 words
A color switching liquid crystal display according to claim 1, in which said means for applying an electric field generates an electric field having a voltage higher than the threshold voltage for re-alignment of the liquid crystal molecules and the voltage and a frequency not causing dynamic scattering.
Claim 11
Dependent Claim
46 words
A color switching liquid crystal display according to claim 1, in which said means for applying an electric field generates an electric field having a voltage higher than the threshold voltage for causing dynamic scattering and the voltage and a frequency capable of causing dynamic scattering.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |