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US 3,938,131 AGranted
Energizing circuit for a visual display element
AssigneeU.S. Philips Corporation
InventorsRudolf Alexander Van Doorn, Pieter Tammo Bolwijn
Life of this patent
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Abstract
An energizing circuit for a redox display device in which a criterion for terminating the registering or erasing action is provided for the energizing electrodes.
Claims5
An energizing circuit for a visual display element having energizing electrodes, comprising a liquid situated between said energizing electrodes, said liquid comprising a redox pair with one component being insoluble, a power supply source coupled to said energizing electrodes capable of being disconnected;
- a threshold circuit having an output for controlling the power supplied to the display element by said supply source;
- and a first polarity change-over switch coupled between said supply source and the display element for changing over between a registering state and an erasing state.
Dependencies are inferred from the claim text.