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US 3,942,872 AGranted
Liquid crystalline display
AssigneeXerox Corporation
InventorFranklin D. Saeva
Life of this patent
Estimating the term…
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.
Claims11
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.
1 more element
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.
2 more elements
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.
1 more element
Dependencies are inferred from the claim text.