COMPACT OPTICAL PROJECTION APPARATUS

摘要

In described examples, apparatus (130) for light projection includes at least one illumination device (131). A cover prism (135) includes a curved surface (141) positioned to receive illumination light rays (153) and a total internal reflection surface positioned to internally reflect the light rays towards an asymmetric reflector surface (143) positioned opposite the total internal reflection surface. The asymmetric reflector surface (143) is configured to reflect the received light rays out of the cover prism (135) at an emitter side of the cover prism. A spatial light modulator (139) modulates the illumination light rays with image data to form image light rays. A reverse total internal reflection (RTIR) (133) prism is positioned between the spatial light modulator (139) and the emitter side of the cover prism (135). A total internal reflection surface is configured to totally internally reflect the image light rays out of the RTIR prism (133) into a light projection device (145).