Patent ID: 6407519
Filing Date: 2002-06-18
Classification: G09G,H04N

Abstract:
A CRT (cathode-ray tube) system of a raster scan type that displays images ona screen by deflecting an electron beam, which has been modulated using a video signal, to consecutively scan the screen in a main scanning direction while scanning in a sub-scanning direction that is perpendicular to the main scanning direction, the CRT system comprising: speed modulating means for modifying a deflection speed by modulating a deflection signal that is used to deflect the electron beam in either the sub-scanning direction or the main scanning direction, the deflection speed being a speed at which the electron beam traverses the screen in either the sub-scanning direction or the main scanning direction; amplitude modulating means for performing modulation by increasing the amplitude of a video signal corresponding to a center of the screen in the main scanning direction, and decreasing the amplitude of a video signal corresponding to edges of the screen in the main scanning direction; and frequency modulating means for performing frequency modulation on the deflection signal and/or the video signal either before or after the amplitude modulation.