| 摘要 |
PURPOSE:To suppress a face flicker and an inter-line flicker by using n sets of projective tubes to generate rasters having an interval of 1/n vertical period each and bringing the illuminant frequency of the screen into n times the field frequency. CONSTITUTION:A video signal is applied to n sets of projective tubes whose projected light beams are projected overlappingly on a screen while deviating the video signal sequentially at an interval of 1/n vertical period each and the deflection of the n sets of projecting tubes is shifted sequentially by the 1/n vertical period. In a video projector where two black/white projecting tubes 1P, 1Q whose projected light beams are projected on one screen 2 for example, a video signal is applied to one tube, e.g., to the tube 1Q while shifting it for the 1/2 vertical period, and the deflection of the projecting tube 1Q is shifted by the 1/2 vertical period.
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