Patent US4669580A successfully refreshed from Google Patents.
Patent US3942872A successfully refreshed from Google Patents.
US3942872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystalline display
Assignee: Xerox Corp
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Filing: 1974-04-29
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Granted: 1976-03-09
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Expires: 1994-04-29
Abstract
Abstract The optical transitions of extrinsically optically active insoluble materials become optically active and circularly dichroic when in contact with optically negative liquid crystalline materials thereby providing unusual and highly advantageous properties. The circularly dichroic optical properties induced in the extrinsically optically active insoluble materials can be utilized for optical display applications.
Inventors
- 👤 Franklin D. Saeva
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F2201/00; G02F2201/34; G02F2201/343; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
A method for providing a display, comprising: a. providing an imaging member comprising a layer of an optically negative liquid crystalline material arranged between a pair of electrodes, at least one of which is substantially transparent, said liquid crystalline material being in contact with at least one insoluble material, said insoluble material when in contact with said optically negative liquid crystalline material becoming extrinsically optically active and having an absorption band within which circular dichroism is induced, said liquid crystalline material being at a temperature in its negative-positive optical transition range; b. applying an imagewise configured electrical field across said layer within the optically negative-positive transition electrical field strength range of said liquid crystalline material thereby extinguishing said induced circular dichroism in imagewise configuration and leaving induced circular dichroism in a pattern complementary to said imagewise configuration; and c. viewing said induced circular dichroism in said complementary pattern through a circular polarizer.
Claim 2
Independent Claim
152 words
A method for providing a display, comprising: a. providing an imaging member comprising a layer of an optically negative liquid crystalline material arranged between a pair of electrodes, at least one of which is substantially transparent, said liquid crystalline material being in contact with at least one insoluble material, said insoluble material when in contact with said optically negative liquid crystalline material becoming extrinsically optically active and having an absorption band within which circular dichroism is induced, said liquid crystalline material being at a temperature in its negative-positive optical transition range; b. applying an imagewise configured electrical field across said layer within the optically negative-positive transition electrical field strength range of said liquid crystalline material thereby extinguishing said induced circular dichroism in imagewise configuration and leaving induced circular dichroism in a pattern complementary to said imagewise configuration; and c. viewing said induced circular dichroism in said complementary pattern through a circular polarizer.
Claim 3
Dependent Claim
18 words
The method as defined in claim 1 wherein said circular polarizer comprises a linear polarizer and quarter waveplate.
Claim 4
Dependent Claim
42 words
The method as defined in claim 1 wherein said insoluble material comprises a member selected from the insolubilized group consisting of aromatic compounds, azo compounds, nitro compounds, nitroso compounds, anil compounds, carbonyl compounds, thiocarbonyl compounds, alkenes, heterocyclic compounds, alkanes and mixtures thereof.
Claim 5
Dependent Claim
20 words
The method as defined in claim 1 wherein at least one of said electrodes is shaped in said imagewise configuration.
Claim 6
Dependent Claim
18 words
The method as defined in claim 1 wherein said insoluble material is dispersed within said liquid crystalline material.
Claim 7
Dependent Claim
24 words
The method as defined in claim 5 wherein the insoluble material content of said liquid crystal layer comprises up to about 90% by weight.
Claim 8
Dependent Claim
16 words
The method as defined in claim 1 wherein said insoluble material is in a layer configuration.
Claim 9
Independent Claim
131 words
A method for providing a display, comprising: a. providing an imaging member comprising a layer of an optically negative liquid crystalline material shaped in image configuration between a pair of electrodes at least one of which is substantially transparent, said liquid crystalline material having dispersed therein at least one insoluble material; said insoluble material becoming extrinsically, optically active and, having a light absorption band within which circular dichroism is induced, by being in contact with said optically negative liquid crystalline material; said liquid crystalline material being at a temperature in the negative-positive transition range of said liquid crystalline material; and b. while viewing said imaging member through a circular polarizer, applying an electrical field across said layer within the optically negative-positive transition electrical field strength range of said liquid crystalline material.
Claim 10
Independent Claim
131 words
A method for providing a display, comprising: a. providing an imaging member comprising a layer of an optically negative liquid crystalline material shaped in image configuration between a pair of electrodes at least one of which is substantially transparent, said liquid crystalline material having dispersed therein at least one insoluble material; said insoluble material becoming extrinsically, optically active and, having a light absorption band within which circular dichroism is induced, by being in contact with said optically negative liquid crystalline material; said liquid crystalline material being at a temperature in the negative-positive transition range of said liquid crystalline material; and b. while viewing said imaging member through a circular polarizer, applying an electrical field across said layer within the optically negative-positive transition electrical field strength range of said liquid crystalline material.
Claim 11
Dependent Claim
19 words
The method as defined in claim 8 wherein said circular polarizer comprises a linear polarizer and a quarter waveplate.
Claim 12
Independent Claim
124 words
A method for providing a display, comprising: a. providing an imaging member comprising a layer of optically negative liquid crystalline material in contact with a layer of insoluble material shaped in image configuration, said layers between a pair of electrodes at least one of which is substantially transparent, said liquid crystalline material being at a temperature in the negative-positive optical transition range of said liquid crystalline material; said insoluble material becoming extrinsically optically active and having a light absorption band within which circular dichroism is induced by contact with said optically negative liquid crystalline material; and b. while viewing said imaging member through a circular polarizer, applying an electrical field across said layers within the optically negative-positive transition range of said liquid crystalline material.
Claim 13
Independent Claim
124 words
A method for providing a display, comprising: a. providing an imaging member comprising a layer of optically negative liquid crystalline material in contact with a layer of insoluble material shaped in image configuration, said layers between a pair of electrodes at least one of which is substantially transparent, said liquid crystalline material being at a temperature in the negative-positive optical transition range of said liquid crystalline material; said insoluble material becoming extrinsically optically active and having a light absorption band within which circular dichroism is induced by contact with said optically negative liquid crystalline material; and b. while viewing said imaging member through a circular polarizer, applying an electrical field across said layers within the optically negative-positive transition range of said liquid crystalline material.
Claim 14
Dependent Claim
19 words
The method as defined in claim 10 wherein said circular polarizer comprises a linear polarizer and a quarter waveplate.
References Cited (Backward Citations)
US3697150A
Cited
US3780307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |