Drive circuit for powder type electroluminescent device with cha

Details Drive circuit for powder type electroluminescent device with cha Drive circuit for powder type electroluminescent device with cha

1994-08-15

1996-05-21

Pascal, Robert

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315307, 315225, 345 76, 345 77, 345212, H05B 3702

Patent

active

055192882

ABSTRACT:
A powder type electroluminescent (EL) device comprises a step-up circuit for charging a capacitive EL element during a charge period, discharge transistor for discharging electric charge from the EL element during a discharge period, a voltage detector for detecting the predetermined voltage of the EL element to generate a charge-up signal, and a control section for starting the discharge period responsive to the charge-up signal. Even if the equivalent capacitance of the EL element decreases or the loss in the EL element increases with an enviromental condition, deterioration in luminous intensity does not arise. Accordingly, a longer life of the EL device can be obtained.

REFERENCES:
patent: 4182977 (1980-01-01), Stricklin, Jr.
patent: 4443741 (1984-04-01), Tanaka et al.
patent: 4527096 (1985-07-01), Kindlmann
patent: 4982314 (1991-01-01), Miki
patent: 5144203 (1992-09-01), Fujita et al.
patent: 5218272 (1993-06-01), Jones
patent: 5233339 (1993-08-01), Newman et al.

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