SPD films and light valves comprising same
First Claim
1. A film suitable for use as the light-modulating unit of an SPD light valve, said film comprising a cross-linked polymer matrix and having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix, said liquid light valve suspension comprising particles suspended in a liquid suspending medium, wherein both said matrix and said droplets have a refractive index within a range of from 1.455 to 1.463.
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Accused Products
Abstract
A film suitable for use as the light-modulating unit of an SPD light valve, the film comprising a cross-linked polymer matrix and having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix, the liquid light valve suspension comprising particles suspended in a liquid suspending medium, wherein the matrix and the droplets each have a refractive index within a range of from about 1.455 to 1.463 and wherein the refractive index of the droplet and the matrix components of the film are preferably matched as closely as possible within RI 0.005 of each other.
128 Citations
30 Claims
- 1. A film suitable for use as the light-modulating unit of an SPD light valve, said film comprising a cross-linked polymer matrix and having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix, said liquid light valve suspension comprising particles suspended in a liquid suspending medium, wherein both said matrix and said droplets have a refractive index within a range of from 1.455 to 1.463.
- 11. A film suitable for use as the light modulating unit of an SPD light valve, said film comprising a cross-linked polymer matrix and having droplets of a liquid light-valve suspension distributed in the cross-linked polymer matrix, said liquid light valve suspension comprising particles suspended in a liquid suspending medium, wherein the film is radiation cured by application of electron beam radiation or ultraviolet radiation, and wherein said film has a decay time of less than about 5 seconds.
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22. A method of preparing a film suitable for use as the light modulating unit of an SPD light valve, said method comprising:
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preparing a quantity of a polymer matrix material;
forming an emulsion from the combination of at least a portion of the polymer matrix material and a quantity of a liquid light valve suspension, said liquid light valve suspension comprising a plurality of particles suspended in a liquid suspending medium, wherein said droplets and said matrix both have a refractive index within a range of from 1.455 to 1.463; and
cross-inking the polymer matrix to produce a film having droplets of the liquid light valve suspension distributed in the cross-linked polymer matrix. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification