| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a projection type video display device capable of reducing flickers in a configuration performing optical scroll on a display element. <P>SOLUTION: Motor phase information B is taken out from a motor 11 and supplied to a delay circuit 21. The delay circuit 21 outputs motor phase information C wherein the motor phase information B is delayed by prescribed time. A comparator circuit 22 receives input of the synchronizing signal of the motor phase information C and a video signal to detect the phase difference, and provides the phase difference signal to a rotation control section 13. The rotation control section 13 receives the phase difference signal and controls the rotation period of a scroll disk 4 so as to coincide with the vertical synchronization. A frequency multiplying circuit 23 outputs a signal of the vertical synchronizing signal multiplied by positive number times such as double or three times or the like. A drive lamp driving section 24 receives the signal multiplied by positive number times and pulse-drives a light source 1. <P>COPYRIGHT: (C)2004,JPO</p> |
