| 摘要 |
The present invention includes a DC signal generating circuit for generating a DC signal and a ramp signal generating circuit for generating a periodic ramp signal. A synthesizing circuit is then used to combine the DC signal and the ramp signal to generate a synthesized signal, where the DC level of the synthesized signal is determined by the DC level of the DC signal. A driving circuit is used to amplify the power of the synthesized signal. A rotate coil surrounding the neck of a cathode-ray tube is responsive to the amplified synthesized signal, and therefore generates a magnetic force to turn electron beam in the cathode-ray tube, thereby compensating the trapezoidal distortion on the bottom and the top edges of a screen display.
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