An image display system comprises red, green and blue laser light source units (22 to 24), a spatial light modulator (25) that modulates the laser lights of different colors in a time sharing manner and a control unit (13) for controlling the operation of the laser light source units and the spatial light modulator. The green and red laser light source units are lighted in that order in each frame. The green color is diminished owing to the response delay of the spatial light modulator, but the green laser light produced by the green laser light source unit (23) has a relatively large color phase shift from the standard green color so that the shortage of green color cancels out with the color phase shift of the generated green color so that the color phase shift of the displayed intermediate color can be minimized.