公开(公告)号：BE860552A

公开(公告)日：1978-03-01

申请号：BE182407

申请日：1977-11-07

Applicant: IBM

Inventor： SOWTER B R ,  HALLETT M H ,  HENEGHAN M J

IPC: G06F3/153 ,  G09G1/00 ,  G09G1/04 ,  G09G1/28 ,  G09G5/30 ,  H04N3/23 ,  H04N9/28 ,  H01J

Abstract: A three color 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 analog converter and then applied to the convergence coils of the tube.

公开(公告)号：AU509002B2

公开(公告)日：1980-04-17

申请号：AU3165877

申请日：1977-12-16

Applicant: IBM

Inventor： HALLETT M H ,  SOWTER B R ,  HENEGHAN M J

IPC: G06F3/153 ,  G09G1/00 ,  G09G1/04 ,  G09G1/28 ,  G09G5/30 ,  H04N3/23 ,  H04N9/28 ,  H04N3/22

Abstract: A three color 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 analog converter and then applied to the convergence coils of the tube.