Abstract: A spatial optic modulating system with speckle reduction and a method thereof are disclosed. According to an embodiment of the present invention, a spatial optic modulating system includes a spatial optic modulator, which modulates and reflects an image transferred in accordance with an upward or downward movement of a ribbon that is operated according to a contraction or expansion of a piezoelectric element, an image lens unit, which transfers an image modulated from the spatial optic modulator as a diffraction image to a scanner, and a phase modulator, which modulates a phase of the diffraction image transferred from the image lens unit. With the present invention, an image, from which a speckle is removed, can be displayed by modulating a phase of an image projected by using a spatial optic modulator.

Abstract: Disclosed herein is a diffractive waveguide-spatial optical modulator. The diffractive waveguide-spatial optical modulator includes a substrate member, a plurality of reflecting members, and an actuation means. The reflecting members are each formed in a plate shape, are arranged on the substrate member at regular intervals to form a grating array, are configured to form openings therebetween, and are provided with reflecting surfaces formed on the opposite vertical surfaces of the reflecting members and the bottoms of the openings. The actuation means varies the interval between the reflecting members by actuating the reflecting members. The openings between the reflecting members act as wave guides when light is incident on the open sides thereof, and shift the phase of the incident light and then reflect the incident light, so that the reflected light can form diffracted light, when the interval is varied by the reflecting members.