Laser projection display system provided with a pair of optical elements for decreasing speckle

摘要

The display system of the present invention 100 is a light source for emitting a light beam having a predetermined wavelength (110) , illumination lens unit for focusing the emitted light beam 120, an optical modulator for modulating the focused light beam 130, a first projection lens unit for converting the modulated light beam into parallel light 140 , and symmetric to each other the center axis of symmetry to the speckle reducing unit for reducing the speckle light parallel to a pair of optical elements for transmitting rotary motion at an angle (150 ), and to project on the screen is reduced by expanding the parallel light speckle for a second projection lens unit (160) . A pair of transparent optical element has a thickness of 2mm, a refractive index of 1.5 , a horizontal tilt angle range of 45 ~ 60 relative to the reciprocating rotational movement is in the range of about 5.7 .