Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1987-05-28
1989-06-13
DeMeo, Palmer C.
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
340781, 34082581, G09F 900
Patent
active
048395633
ABSTRACT:
A thin film electroluminescent display device energized with a rapid burst of pulses during a time less than the decay time of the phosphor yields substantially increased light output. Preferably, a burst of between two and forty pulses having a duration in the range between 5 and 20 microseconds and having alternating polarities is applied to the device. The pulse burst technique is advantageously applied to a dot matrix type EL display panel operating at a 60 Hz refresh rate. For a 512.times.256 element display panel, each row is addressed for approximately 65 microseconds, and four pulses of about 12-15 microseconds each are applied to the EL pixels during each row address time. The pulse burst technique provides increased brightness while minimizing the retained image problem.
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T. Kawada et al, "A Symmetric Drive with Low Voltage Drivers for ac TFEL," Japan Display, '86, pp. 272-275.
Display Driver Handbook, Texas Instruments, 1983, pp. 2-33 to 2-39.
Boudreau Robert A.
Brown Robert E.
DeMeo Palmer C.
Finnegan Martha Ann
GTE Products Corporation
McClellan William R.
Salindong T.
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