REDUCED FIELD ANGLE PROJECTION DISPLAY SYSTEM

摘要

A rear projection display system and associated optical system are described with a reduced field angle. The rear projection display system includes a screen (20) and a housing. The optical system includes a light engine (102), a first mirror (104), a second mirror (106) and a Fresnel lens (108) arranged to achieve a thin housing. The light engine (102) is generally disposed in an upper region o the housing, and projects light onto the first mirror (104), which can be located at a bottom portion of the housing. The first mirror (104) reflects the projected light onto the second mirror (106), which in turns reflects the light towards the Fresnel lens (108), whic transfers the light onto the screen (20). A total internal reflection Fresnel lens (108) is used to reduce cost and complexity without sacrificing image quality and housing thinness.