Method of making a variable density light control apparatus by stretching an unsupported film
First Claim
1. A method of making a liquid crystal polarizer comprising casting an emulsion of liquid crystal material with pleochroic dye in a containment medium to form a film, and forming substantially permanent elongate volumes of said liquid crystal material and pleochroic dye in said containment medium by stretching the film while it is unsupported, and wherein said forming step comprises curing said cast material while stretching said cast material.
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Abstract
A method of making a liquid crystal polarizer includes casting an emulsion of liquid crystal material with pleochroic dye in a containment medium, and forming elongate volumes of said liquid crystal material and pleochroic dye in said containment medium. A liquid crystal polarizer device includes liquid crystal material having low birefringence, a containment medium for containing said liquid crystal material in elongate volumes, and means in combination with said liquid crystal material for affecting polarization of light incident thereon; the liquid crystal material being responsive to a prescribed input to change the optical polarization characteristic of the device.
37 Citations
13 Claims
- 1. A method of making a liquid crystal polarizer comprising casting an emulsion of liquid crystal material with pleochroic dye in a containment medium to form a film, and forming substantially permanent elongate volumes of said liquid crystal material and pleochroic dye in said containment medium by stretching the film while it is unsupported, and wherein said forming step comprises curing said cast material while stretching said cast material.
- 7. A method of making a liquid crystal polarizer comprising casting an emulsion of liquid crystal material with pleochroic dye in a containment medium to form a film, and forming substantially permanent elongate volumes of said liquid crystal material and pleochroic dye in said containment medium by stretching the film while it is unsupported, and wherein the width of said elongate volumes measured in a direction perpendicular to the axis of elongation is approximately 0.5 to 7 microns.
- 9. A liquid crystal polarizer comprising liquid crystal material having low birefringence, a containment medium for containing said liquid crystal material in elongate volumes, and means in combination with said liquid crystal material for affecting polarization of light incident thereon, and wherein the width of said elongate volumes measured in a direction perpendicular to the axis of elongation is approximately 0.5 to 7 microns.
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11. A method of making a liquid crystal polarizer comprising casting liquid crystal material in a containment medium to form a film, and forming substantially permanent elongate volumes of said liquid crystal material by stretching the film while it is unsupported said casting comprising casting an emulsion of liquid crystal material, containment medium and pleochroic dye, allowing the emulsion to at least partially cure, and said forming comprising substantially longitudinally stretching the emulsion in a partially cured state to form substantially permanent elongate volumes of said liquid crystal material and pleochroic dye in said containment medium.
- 12. A method of making a liquid crystal polarizer comprising casting liquid crystal material in a containment medium to form a film, and forming substantially permanent elongate volumes of said liquid crystal material by stretching the film while it is unsupported, allowing the film to at least partially cure, and said forming comprising substantially longitudinally stretching the film while in the partially cured state.
Specification