Deflection yoke with multiple pairs of vertical coils and switched deflection current

A method for correcting for mis-convergence error in a cathode ray tube comprising:

• switching a deflection current through first coil when an electron beam of the cathode ray tube is currently pointing in an edge region of a screen of the cathode ray tube;
• and
• coupling the deflection current through a second coil when the electron beam of the cathode ray tube is currently pointing in a middle region of the screen of the cathode ray tube.

An apparatus for controlling convergence of an electron beam in a cathode ray tube comprising:

• a first plurality of coils optimized to correct for convergence errors related to a first region of a screen of the cathode ray tube and activated when an electron beam of the cathode ray tube is currently pointing in the first region of the screen of the cathode ray tube;
• and
• a second plurality of coils optimized to correct for convergence errors related to a second region of the screen of the cathode ray tube and activated when an electron beam of the cathode ray tube is currently pointing in the second region of the screen of the cathode ray tube.

An apparatus for controlling convergence of an electron beam in a cathode ray tube comprising:

• a first plurality of coils optimized to correct for convergence errors related to a first region of a screen of the cathode ray tube;
• a second plurality of coils optimized to correct for convergence errors related to a second region of the screen of the cathode ray tube;
• and a timing circuit to control activation of the first and second plurality of coils in accordance with a location on the screen in which the electron beam is currently pointing.