Electro-optic picture display and memory device
AssigneeU.S. Philips Corporation
InventorsKlaus Friedrich Leonhard Carl, Karl Heinz Hardtl
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Abstract
An electro-optic picture display and memory device employs a material which has the property of field-induced ferroelectricity such as lanthanum-containing mixed crystals of lead zirconate and lead titanate. Remanent storage is achieved in that certain electrodes on the plate are separated from the signal generator while the signal voltage is still present.
Claims5
An electro-optic picture display and memory device for storage and display of information by direct read-out comprising a plate of quasi-ferroelectric material in which ferroelectricity is field-induced and produces double refraction of light, electrodes on said plate, means to apply a potential between selected electrodes on said plate, means to remove said potential while a field pulse is still present to induce remanent storage of information in said plate, and means to short-circuit said electrodes to erase information stored in said plate.
Dependencies are inferred from the claim text.