an image projection apparatus including a light source for emitting a plurality of monochromatic color beams having different wave lengths ; a first light transmit unit ; a light switch unit having a plurality of mirrors for selectively deflecting the monochromatic color beams at a predetermined angle ; a quadrangular beam generating unit for converting the reflected monochromatic color beams into quadrangular beams having certain ratios of length to height ; a panel for receiving the converted quadrangular beams and forming a monochromatic color bar on at least one portion of upper , mid , and lower portions thereof ; and a projection lens unit disposed opposite to the panel . accordingly , by using the light switches , a monochromatic color bar is formed on single panel with the same utilization efficiency of light as that of three panels , thereby embodying a high image quality .