Electronic display device for timepiece and the like

Details Electronic display device for timepiece and the like Electronic display device for timepiece and the like

1975-06-18

1977-02-08

Witkowski, Stanley J.

58 23A, 58 23BA, 58 50R, G04B 1932, G04C 300

Patent

active

040065839

ABSTRACT:
Disclosed is a light emitting diode display system powered by ambient light. This solid state electronic display device comprises an ambient irradiated photovoltaic battery energizing through an electronic adapter circuit light emitting diodes selectively chosen to display the desired information. The adapter circuit transforms the electrical power continuously supplied by the photovoltaic battery into energy pulses which are periodically applied to the display. In addition, the adapter circuit automatically adjusts the display brightness in accordance with the ambient illumination level. At low and zero light levels, the electronic display device maintains a visible display by deriving power from a secondary energy source.

REFERENCES:
patent: 3078364 (1963-02-01), Neugebauer
patent: 3116883 (1964-01-01), Neugebauer
patent: 3129415 (1964-04-01), McKnight
patent: 3485033 (1969-12-01), Langley
patent: 3608301 (1971-09-01), Loewengart
patent: 3630015 (1971-12-01), Lehovec
patent: 3672155 (1972-06-01), Bergey et al.

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