System for controlling the position of an electron beam in a cathode ray tube and method thereof

A method for controlling an electron beam in a cathode ray tube comprising the steps of:

• generating an electron beam in the cathode ray tube;
• deflecting the electron beam in a desired direction towards a faceplate in the cathode ray tube,
• generating at least one position signal when the electron beam strikes one of a pair of electrodes formed on an inner surface of the faceplate;
• capacitively coupling the position signal to an electron beam controller through a funnel of the cathode ray tube;
• and
• adjusting the deflection of the electron beam in response to the position signal.

A cathode ray tube comprising:

• a funnel with a pair of opposing ends, an inner surface, and an outer surface;
• a faceplate secured to one of the opposing ends of the funnel, the faceplate having inner and outer surfaces;
• a pair of first capacitor plates disposed on the inner surface of the funnel;
• a pair of second capacitor plates disposed on the outer surface of the funnel, each of the second capacitor plates being disposed opposite one of the first capacitor plates;
• and
• at least one pair of electrodes formed on the inner surface of the faceplate, each pair of electrodes being spaced apart a first distance, one of the electrodes being coupled to one of the first capacitor plates and the other electrode being coupled to the other first capacitor plate.