Illumination – Display backlight – Lcd backlight
Patent
1978-06-23
1980-01-15
Lechert, Jr., Stephen J.
Illumination
Display backlight
Lcd backlight
362184, 362260, 362311, G09F 1304
Patent
active
041841948
ABSTRACT:
A self-energized portable high intensity light display unit is provided for displaying transparencies such as X-ray films, photographic films, and the like. The unit includes a casing having rolled-over sides which serve as housings for a number of batteries and for a circuit board, a reflective panel extending across the casing and supporting three fluorescent lamps in spaced parallel relationship, a translucent panel supported above the fluorescent tubes, and a pair of end members which serve to hold all of the aforementioned components in an assembled condition and which serve as interconnects for the batteries. The circuit board serves to convert a 12-volt battery voltage into 20-25 KHz alternating current voltage at 800-1000 volts. The fluorescent lamps are connected in series. A relay initially connects two of the lamps in series across the alternating current voltage when the unit is first turned on until they are started, and then the relay connects the third lamp in series with the other two across the alternating current voltage. The result is a simple and inexpensive high intensity display unit of low current drain.
REFERENCES:
patent: 2629043 (1953-02-01), Holtje
patent: 3356839 (1967-12-01), Mehess et al.
patent: 4071883 (1978-01-01), Dennis
Beecher Keith D.
Lechert Jr. Stephen J.
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