Dynamic focus controller and control method of the same

A dynamic focus control method of a television having a cathode ray tube (CRT), comprising:

• generating a vertical parabola signal based on a vertical frequency of a television broadcast signal;
• generating a horizontal and vertical overlap parabola signal by receiving a horizontal pulse based on a horizontal frequency of the television broadcast signal and the vertical parabola signal;
• controlling so that the horizontal and vertical overlap parabola signal has a predetermined size on based the horizontal frequency;
• and
• applying a focus control signal to the CRT according to the horizontal and vertical overlap parabola signal.

A computer readable medium having instructions for focusing a television having a cathode ray tube, comprising:

• a first set of instructions for generating a vertical parabola signal based on a vertical frequency of a television broadcast signal;
• a second set of instructions for generating a horizontal and vertical overlap parabola signal by receiving a horizontal pulse based on a horizontal frequency of the television broadcast signal and the vertical parabola signal;
• a third set of instructions for controlling so that the horizontal and vertical overlap parabola signal has a predetermined size on based the horizontal frequency;
• and
• a fourth set of instructions for applying a focus control signal to the CRT according to the horizontal and vertical overlap parabola signal.