H - Electricity – 01 – J
Patent
H - Electricity
01
J
355/9
H01J 29/70 (2006.01)
Patent
CA 1155234
ABSTRACT OF THE DISCLOSURE A deflection amplifier gain correction circuit for a beam penetration colour 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 focusing 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 colour penetration tube using two different coloured phosphors. By producing such registration for beams having different anode voltages, various mixes of colours can be produced to form, for example, four distinct colours on a display from two phosphors with colour impurity being reduced by reduction in misregistration of different colours at the edges of the cathode ray tube screen.
410541
Raytheon Company
Smart & Biggar
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