Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1981-11-02
1988-02-16
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
315209R, 315217, 340753, 340781, G09G 310
Patent
active
047257610
ABSTRACT:
An energy saving electroluminescent sheet or panel adaptable to lighting of writing or drawing sheets to permit writing thereon in the dark or to lighting sheets to permit reading of written or other intelligible matter thereon. The luminescent sheet or panel has a light field composed of a number of electrically activatable light segments adaptable to activation independently or in sequence at an intermittent rate or frequency sufficient that the normal eye persistence of observers will produce in effect a coherent light output from the entire light field or selected portions of the light field with a relatively small power source. The light segments can be aligned in any of a number of relationships such, for example, as in side-by-side relation, in radially extending relation or in circumferentially relation. Light activatable phosphorescent matter can be combined in association with the electrically activated regions to become activated thereby to provide persistence and impart a close coherence of light output even at low frequencies of activation of the electroluminescent segments.
REFERENCES:
patent: 3194003 (1965-07-01), Polin
patent: 3258906 (1966-07-01), Demby
patent: 3885196 (1975-05-01), Fischer
patent: 4204399 (1980-05-01), Heynisch
Schroeder Becky J.
Schroeder Charles F.
Chatmon Saxfield
Schroeder Charles F.
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