| 摘要 |
PURPOSE:To obtain a reproducing picture with high luminance and high resolution by making a read speed of a frame memory from a deflection speed of a cathode ray tube in response to the after glow characteristic of plural cathode ray tubes so as to decrease the beam spot size. CONSTITUTION:A video signal Sv obtained from a detection circuit 10 is subject to A/D conversion and fed to a matrix circuit 13. Each primary color signal of red/green/blue is obtained fromthe matrix circuit 13 and fed to frame memories 15R, 15G, 15B being components of the converting circuit respectively. The signal from the frame memories 15R, 15G, 15B is read based on the output from control circuits 21R, 21G, 21B and the primary color signals of red/green/blue is read respectively in four multiple speed from the memory 15r, in a double speed from the memory 15G and in eight-time speed from the memory 15B. The primary color signals are subject to D/A conversion and fed to cathode ray tubes 6R, 6G and 6B and also the deflection speed of each cathode ray tube is controlled in response to the said read speed.
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