Correction apparatus for a cathode-ray tube

Details Correction apparatus for a cathode-ray tube Correction apparatus for a cathode-ray tube

H - Electricity

01

J

355/9

H01J 29/56 (2006.01) H04N 9/28 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1160353

CORRECTION APPARATUS FOR A CATHODE-RAY TUBE ABSTRACT Non-linearities of an electron beam in a cathode-ray tube are corrected in accordance with the position of the beam by circuitry which completes the correction from stored digital values. In response to positional signals X and Y, correction waveforms are generated in analogue circuits 8H, 8V and 10. The waveforms are scalled by circuits 11 in accordance with the stored digital values and are summed in circuits 9R to 9L and applied to the windings of the cathode- ray tube. Preferably the invention is applied to the correction of misconvergence in a shadow-mask colour tube. UK9-79-005

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