Abstract: The invention and method enable the astigmatism correction at each crossing point of a cross hatch pattern, thereby making high-resolution display possible. An appropriate voltage or current for controlling the magnetic field adjusting coils are generated from the correction data stored in a memory. The voltage or current generated are then applied to two poles, four poles or six poles during scanning of the screen.

Abstract: Disclosed is a digitally controlled dynamic convergence correction device for correcting arbitrary convergence astigmatism on a screen in a deflection yoke of a CRT picture device. The invention provides a method for controlling digital dynamic convergence and a system thereof to perform individual and independent correction of the convergence for each crossing point of a cross hatch pattern on a screen by receiving correction data from outside and storing the same in memory, reading the correction data from the memory, and converting the correction data to a voltage or a current so as to have a structure of outputting to magnetic field adjusting coils. The invention enables a worker to approach controlling of the convergence with respect to the control points defined by each crossing point on a screen of a cross hatch pattern.