Radio-frequency driven display

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load

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Details

315344, 362367, H05B 4116

Patent

active

050197509

ABSTRACT:
A video display for use in conveying information as, for example, in a sports stadium. The video display includes a plurality of electrodeless lamps mounted in a metallic housing which is defined by a back wall and a front wall. The front wall is provided with a plurality of holes formed therein and is spaced from the back wall by means of side walls. An electrodeless lamp is located within each of the holes in the front wall and is surrounded by a cylindrical wall formed in the front wall. One end of each lamp is in proximity to a conductive plate which is formed to provide an equipotential surface to the lamps. Radio-frequency (RF) energy of from 10 to 100 megahertz is coupled from an external RF power supply to the housing. A strong electric field produced between the portion of the conductive plate in proximity to one end of a lamp and the cylindrical surface surrounding the lamp is sufficient to cause breakdown and excitation of the electrodeless lamp fill material. For controlling the operation of individual lamps, a semiconductor switch is series connected between the conductive plate and each of the lamps.

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