Cathode ray tube apparatus

Details Cathode ray tube apparatus Cathode ray tube apparatus

H - Electricity

04

N

355/9

H04N 9/09 (2006.01) H04N 9/28 (2006.01)

Patent

CA 1113611

IMPROVEMENTS IN CATHODE RAY TUBE APPARATUS ABSTRACT A three colour gun cathode ray tube has convergence correction signals derived from digital signals stored in a digital data store. The screen of the tube is divided into a plurality of areas and a digital correction signal derived for each area. The system is arranged so that when the three beams are scanning a particular area the digital correction signal associated with that area is read out from the digital store, passed through a digital to analogue con- verter and then applied to the convergence coils of the tube. - 1 -

287759

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