Patent ID: 6888325

Claim:
A method for self correcting a pin distortion using a horizontal deflection coil having a neck part, a screen bent part, an extension part connecting the neck part and the screen bent part and having a horizontal deflection coil installed on an upper and lower sides in an inner periphery of a coil separator of a deflection yoke, for generating horizontal deflection magnetic field, the method comprising the steps of: generating pincushion at an edge region on a screen by dividing the screen bent part of the horizontal deflection coil into quadrants, respectively, and by extending an effective electric field length at a specific region of the extension part positioned in a diagonal direction of the screen bent part on each quadrant, closely to a plane in a back of the screen bent part; and correcting pincushion generated in the above step and self inner pin phenomenon on a middle portion by compensating a whole pincushion of the screen through control of a deflection controlling circuit of a display set.