Integrated radio-frequency light source for large scale display

Details Integrated radio-frequency light source for large scale display Integrated radio-frequency light source for large scale display

1990-01-16

1991-06-25

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315344, H05B 4116

Patent

active

050270419

ABSTRACT:
An integrated light source for use in a large scale video display. The light source includes a cylindrical housing containing at least one electrodeless fluorescent lamp and a circuit for starting and operating the lamp. The circuit includes a radio-frequency generator whose output is capacitively coupled to the electrodeless lamp by means of a pair of coupling members mounted adjacent the exterior surface of the lamp's envelope. A strong electric field produced between the coupling members is sufficient to cause breakdown and excitation of the electrodeless lamp fill material. In a preferred embodiment, a circuit coupled to the input of the radio-frequency generator controls operation of the lamp in response to a low voltage control signal. The integrated light source of the present invention overcomes problems in the prior art of premature lamp life due to failures of the electrode or the glass to metal seal.

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