Video-signal processing apparatus and video display system

A video display system comprising:

• an apparatus for processing video signals to control a display device that displays a video by emitting light from a plurality of phosphors corresponding to different colors based on output-display video signals generated by the apparatus, wherein the phosphors emit light in units of sequential fields, the apparatus including
• a processing unit that receives video signals and generates a display video signal for each of the colors from received video signals;
• a delaying unit that generates a delayed display video signal for each display video signal by delaying the display video signal by one field;
• a calculating unit that calculates an afterglow level of at least a first color among the colors based on the delayed display video signals;
• a correction-signal generating unit that generates a correction signal based on the afterglow level;
• a selecting unit that selects, as an output-display video signal for the first color, the display video signal of the first color when a level of the display video signal of the first color is equal to or higher than the correction signal, and selects the correction signal when a level of the display video signal of the first color is lower than the correction signal;
• and
• an output unit that outputs, to the display device, the display video signals for each color other than the first color as output-display video signals for each color other than the first color, and outputs selected output-display video signal for the first color, wherein
• the display device includes
• a displaying unit including a plurality of cells, each cell including a combination of the phosphors corresponding to different colors, and
• a luminous-pulse generating unit that generates luminous pulses, which cause the phosphors to emit light, starting from a forefront of a field, wherein a number of the luminous pulses corresponds to an arbitrary number according to values of the output-display video signals for each color.