Deflection apparatus for raster scanned CRT displays

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

Patent

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Details

315370, 315387, 315411, G09G 104, H01J 2956, H01J 2970

Patent

active

054204844

ABSTRACT:
Deflection apparatus for a raster scanned cathode ray tube display comprises a ramp generator (210) for producing a current ramp signal synchronised to a raster synchronisation signal. A ramp regulator (230) is connected to the generator (210) for varying the amplitude of the scan signal as a function of the difference between a reference input and a feedback signal. A feedback circuit (220) connected to the generator (210) and to the regulator (230) for generating the feedback signal as a function of the amplitude and frequency of the line scan signal. A multiplier (250) is connected to the regulator and for varying the reference input as a function of an integer multiple of the frequency of the raster synchronisation signal. Any scan signal frequency component in the feedback signal is cancelled at the input to the regulator by introducing, via the multiplier (250), a scan signal frequency component to the reference input. Because the displayed picture size is thus made independent of scan signal frequency, the deflection apparatus can maintain a constant picture size despite variations in scanning signal frequency without the bandwidth limitations of the prior art.

REFERENCES:
patent: 4047052 (1977-09-01), Koubek et al.
patent: 4104567 (1978-08-01), Peer et al.
patent: 5023523 (1991-06-01), Tomita
patent: 5049792 (1991-09-01), Oh

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