Device in a time piece for feeding an electro-luminescent displa

Details Device in a time piece for feeding an electro-luminescent displa Device in a time piece for feeding an electro-luminescent displa

1975-05-13

1977-03-08

Trafton, David L.

Communications: electrical

Systems

With specific power supply

58 50R, 315240, 340324R, H01L 3300

Patent

active

040115577

ABSTRACT:
It is known that an electro-luminescent display increases its light emitting efficiency with the current through it. Such a display in a watch run from a small battery, is fed by short impulses of high-intensity current by means of discharges from two capacitors which are alternately charged and discharged by transistor switches opened and closed by externally supplied impulses. The battery current is thus kept substantially constant and low. A series of digits or segments thereof, if used, may be fed in sequence with the impulses.

REFERENCES:
patent: 3603833 (1971-09-01), Logan et al.
patent: 3630015 (1971-12-01), Lehovec
patent: 3742699 (1973-07-01), Bergey
patent: 3760582 (1973-09-01), Thiess et al.
patent: 3841087 (1974-10-01), Kikuchi

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