Colour cathode ray tube display apparatus with compensation...

Details Colour cathode ray tube display apparatus with compensation... Colour cathode ray tube display apparatus with compensation...

H - Electricity

01

J

355/9

H01J 29/70 (2006.01) H01J 29/76 (2006.01) H04N 3/16 (2006.01) H04N 9/28 (2006.01)

Patent

CA 1184316

ABSTRACT A colour cathode ray tube display apparatus is provided with compensation for errors due to interfering magnetic fields in which a deflection yoke causes the electron beams to raster scan across the tube, a convergence assembly on the neck of the CRT adjusting the beam convergence. Errors in the waveforms supplied to the radial convergence assembly are due to high frequency magnetic field coupling between the yoke and the convergence assembly via the internal magnetic structure (7) of the CRT. A compensating coil (11) placed adjacent the affected convergence coil unit (12, 16) supplies compensating current through resistor (20) to the amplifier (15) driving that convergence coil unit, thus avoiding a fringe on the left-hand side of the screen. Alternatively, compensating current can be derived from the line flyback pulse or the logic signal initiating line flyback.

384830

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