| 摘要 |
PURPOSE: A circuit for correcting bending of an upper part of a screen is provided to improve the bending of a screen in the vertical direction for providing high quality screen by reducing a horizontal size for an upper part of the screen by using a vertical flyback pulse corresponding to a vertical feedback period. CONSTITUTION: A circuit for correcting bending of an upper part of a screen includes a deflection driving part(210) for outputting EW wave for correcting E-W pin cushion and sawtooth wave for vertical deflection, a vertical deflection part(250) for applying a sawtooth current of a vertical period to a vertical deflection coil by the input of the sawtooth wave from the deflection driving part and outputting a vertical synchronizing pulse for deflecting electron beams vertically in the magnetic field, an amplification part(220) for overlapping a horizontal size correcting current and an upper bending correcting signal to the EW wave of the deflection driving part and repeating integration and inverse amplification to output parabola waves to a horizontal deflection part(230), a horizontal size correcting part(240) for supplying a beam current as a horizontal size correcting current, and an upper bending correcting part(260) for outputting a vertical synchronizing pulse of the vertical deflection part as an upper bending correcting signal.
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