| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve the quality of an output video signal and to reduce power consumption by preventing noise and ripple from being superimposed on negative voltage to be supplied as much as possible. <P>SOLUTION: In this video circuit provided with a capacitor C2 for a negative voltage power source, requested by a video processing circuit 10 so that a charge pump circuit 20 may generate negative voltage in the capacitor C2, when the level of the negative voltage generated by the capacitor C2 reaches a lower limit value -V2, a negative voltage generating operation by the charge pump circuit 20 is stopped, and when the level of the negative voltage reaches an upper limit value -V1, the negative voltage generating operation by the charge pump circuit is restarted. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
