Light-modulating electrophoretic device
AssigneeE Ink Corporation
InventorDonal Martin O'KEEFFE
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Abstract
A variable light transmittance sheet comprises a first transparent electrode and a second transparent electrode spaced apart from the first electrode, and between the electrodes an electrophoretic cell containing an electrophoretic ink and one or more non-planar solid polymer elements. In an embodiment, the electrophoretic ink includes charged particles in a suspending fluid, and 75% or more by mass of the suspending fluid is an organosilicone or an aliphatic hydrocarbon and the solid polymer is a fluorinated elastomeric polymer.
Claims6
An electrophoretic device comprising a first electrode and a second electrode spaced apart from said first electrode and between said electrodes an electrophoretic cell containing wavelength-selective charged particles that substantially transmit or reflect the sunlight infrared spectrum, the wavelength-selective particles being suspended in an optically-transparent suspending fluid, and one or more optically-transparent, non-planar, solid polymer elements, the refractive indices of said solid polymer elements and said suspending fluid being matched to have a difference of less than 0.0075, and for half or more of the operating temperature range of said device, the thermo-optic coefficients of the solid polymer elements and the suspending fluid being matched to have an arithmetic-mean difference of less than 0.0002/K in magnitude.
An electrophoretic device comprising a first electrode and a second electrode spaced apart from said first electrode and between said electrodes an electrophoretic cell containing wavelength-selective charged particles that substantially transmit or reflect the sunlight infrared spectrum, the wavelength-selective particles being suspended in an optically-transparent suspending fluid, and one or more optically-transparent, non-planar, solid polymer elements, the refractive indices of said solid polymer elements and said suspending fluid being matched to have a difference of less than 0.0075, wherein the matched refractive indices at 25 degrees Celsius and 589.3 nm of light are less than 1.460.
An electrophoretic device comprising a first electrode and a second electrode spaced apart from said first electrode and between said electrodes an electrophoretic cell containing wavelength-selective charged particles that substantially transmit or reflect the sunlight infrared spectrum, the wavelength-selective particles being suspended in an optically-transparent suspending fluid, and one or more optically-transparent, non-planar, solid polymer elements, wherein 75% or more by mass of said optically-transparent suspending fluid is an organosilicone or an aliphatic hydrocarbon, and said solid polymer element comprises a fluorinated elastomeric polymer.
Dependencies are inferred from the claim text.