Display systems

Details Display systems Display systems

1974-08-12

1976-07-27

Trafton, David L.

Communications: electrical

Systems

Portable self-contained

315169TV, 340166EL, 340173DR, G08B 536

Patent

active

039720403

ABSTRACT:
A refreshed electro-optic display comprising a plurality of individually addressed display elements which may be arranged in a matrix form is characterised in that the memory for refreshing is derived from the display elements themselves. Each display element is refreshed by sensing by one or a plurality of sensors the state of a physical property of the element to detect whether or not it has been selected to be operated and by feeding a control signal in an individual feedback loop from the sensor to open an electronic gate, to apply an electrical potential to the element, when sensed to be operated, to keep it in the operated state. The physical property sensed may be the electrical capacitance or resistance of the display elements, the state of light emission or modulation from them or the state of charge storage within them. Preferably a voltage is developed which depends on the state of the property. In that case the sensor can comprise a voltage comparator which compares the sensed voltage with a reference voltage. The display elements may for example be liquid crystal, electroluminescent electrochromic, electrophoretic, or minature plasma elements.

REFERENCES:
patent: 2847615 (1958-08-01), Engelbart
patent: 3533089 (1970-10-01), Wahlstrom
patent: 3559190 (1971-01-01), Bitzer et al.
patent: 3796997 (1974-03-01), Johnson et al.
patent: 3821720 (1974-06-01), Greubel et al.
patent: 3848237 (1974-11-01), Geilhufe et al.

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