Electrostatic alpha-numeric display

Details Electrostatic alpha-numeric display Electrostatic alpha-numeric display

1980-05-19

1981-09-08

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

340373, G08B 500

Patent

active

042887887

ABSTRACT:
To provide a nonvolatile alpha-numeric display, display segments comprising small electrets are arranged in a supporting panel in a desired format such as a conventional seven-segment display. Each electret segment is pivotably mounted in a window in the support panel and has opposite faces of contrasting colors so that the rotational position of the electret segment determines its appearance. Electrodes on opposite sides of each window are connected to a control circuit for applying an electrostatic field across the window effective to cause rotation of the segment from one state to another. Various alpha-numeric characters can be formed by selectively rotating the segments. A switch function on each segment allows the status of each segment to be electrically sensed to thereby provide a nonvolatile memory.

REFERENCES:
patent: 3648281 (1972-03-01), Dahms
patent: 4091382 (1978-05-01), Anderson

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