Electric lamp and discharge devices: systems – Cathode ray tube circuits
Patent
1995-07-21
1998-02-03
Pascal, Robert
Electric lamp and discharge devices: systems
Cathode ray tube circuits
315381, 315383, 348380, H01J 2952
Patent
active
057148422
ABSTRACT:
The present invention, generally speaking, provides for automatic cutoff control in a DC coupled CRT video drive using a low DC supply voltage and circuitry that is lower in power consumption than conventional circuitry for the comparable video performance. A simple, easy to implement solution is achieved with an extremely low component count. Cutoff control response is fast, allowing discontinuous operation of auto cutoff control. In one embodiment of the invention, a cutoff control signal is applied to individual CRT G1 terminals. Fast response cutoff control drive is realized using an IC current source and a single transistor current-to-voltage (CTV) converter. Supply voltage variations on the video driver are clamped via a clamping device to the negative supply voltage of the G1 CTV converter.
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Krause Peter
Ong Aik Keong
Apple Computer Inc.
Bettendorf Justin P.
Pascal Robert
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