Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1979-05-07
1980-09-16
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315371, 358 73, H01J 2980
Patent
active
042232520
ABSTRACT:
A deflection amplifier gain correction circuit for a beam penetration color cathode ray tube having a split high voltage anode in which the deflection waveform is shaped as a non-linear function of the final anode voltage and as a function of a dynamic focus waveform used for the electrostatic focussing system in the cathode ray tube. The shape of the correcting waveform is adjusted by adjusting the amounts of the dynamic focus waveform and the anode switching voltage waveform which are multiplied to produce a resulting waveform which varies as a function of deflection position and anode voltage and is summed with a waveform which is a non-linear function of anode voltage. Such a system can be adjusted for each individual display unit to compensate for production variations in a color penetration tube using two different colored phosphors. By producing such registration for beams having different anode voltages, various mixes of colors can be produced to form, for example, four distinct colors on a display from two phosphors with color impurity being reduced by reduction in misregistration of different colors at the edges of the cathode ray tube screen.
REFERENCES:
patent: Re28631 (1975-11-01), Waehner et al.
patent: 3961223 (1976-06-01), Ray et al.
patent: 4092566 (1978-05-01), Chambers et al.
patent: 4099088 (1978-07-01), Hart
patent: 4104566 (1978-08-01), Shah
Arnold H. W.
Bartlett M. D.
Blum Theodore M.
Pannone J. D.
Raytheon Company
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