LASER PROJECTION DISPLAY SYSTEM INCLUDING A DIFFRACTIVE OPTICAL ELEMENT FOR REDUCING A SPECKLE, CAPABLE OF CHANGING A STEP OF A DIFFRACTION LATTICE

摘要

PURPOSE: A laser projection display system including a diffractive optical element for reducing a speckle is provided to efficiently remove various kinds of speckles by randomly modulating the phase of a laser.;CONSTITUTION: An optical modulator(130) modulates focused light. A projection lens unit(140) changes the modulated light into parallel light. A speckle reducer(150) includes a plurality of micro mirrors which are arranged in a line and perform reciprocating translational motion vertical to a reflection surface and forms a multiple speckle pattern by changing the phase of the light inputted from the projection lens unit. A scanning unit(160) generates an image by scanning diffractive light outputted from the speckle reducer on a screen.;COPYRIGHT KIPO 2010