ELECTROCHROMIC DEVICES
First Claim
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1. A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.
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Abstract
An electro-optical device useful in data display and imaging device typically comprising in sandwiched arrangement a pair of electrodes between which are disposed two similar electrochromic layers separated by a semi-solid conductive medium. The device exhibits superior electrochromic reversibility and greatly improved cell life over prolonged coloration and bleaching cycles.
20 Citations
8 Claims
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1. A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.
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2. A variable light transmission device as in claim 1, which comprises two layers of electrochromic material separated by a semisolid conducting interlayer disposed between a pair of conductive electrodes.
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3. The device of claim 2 wherein the electrochromic layers are composed of the same material.
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4. The device of claim 2 wherein at least one of the electrodes is substantially transparent.
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5. The device of claim 1 wherein at least one of the electrochromic materials is deposited in form of a grid.
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6. The device of claim 4 wherein at least one of the electrochromic materials is deposited in the frame of the transparent electrode.
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7. The device of claim 2 wherein an electrolytically conducting semisolid layer is employed.
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8. A process which comprises subjecting the device of claim 1 to an electric field of alternating polarity whereby coloration and bleach cycles are obtained without change in voltage time characteristics.
Specification