公开(公告)号：EP0185082B1

公开(公告)日：1990-08-16

申请号：EP85903466.2

申请日：1985-06-10

申请人： RCA LICENSING CORPORATION

发明人： McDONALD, James, Alexander ,  WAYBRIGHT, George, Cleveland ,  WILLIS, Donald, Henry ,  SUTHERLAND II, Hugh, Ferrar ,  LUZ, David, Warren ,  HAFERL, Peter, Eduard

IPC分类号： H04N3/233 ,  H01J29/56

CPC分类号： H04N3/233

摘要： Line (20) and field (40) deflection circuits generate line and field deflection currents in respective line (LH) and field (Lv) deflection windings to scan a raster on the phosphor screen of a square-planar picture tube having an aspherical faceplate. The asphericity of the faceplate (30) subjects the scanned raster to gullwing distortion. A gullwing distortion correction circuit (70) is responsive to signals repeating at line and field rates, respectively, for modulating the field deflection current during a line deflection period within the field deflection trace interval in a manner that corrects gullwing distortion of a corresponding raster scan line.