Optical micro-projection system and projection method

摘要

An optical micro-projection system comprising the following components: at least one laser light source (200, 400, 402, 600); at least one movable mirror (102, 103, 203) for deviating light from said light source to allow generation of images on a projection surface (104, 301, 303, 306, 603); a self mixing module for measurement of the distance (604) between the projection source and a projection surface, said self mixing module comprising: —at least one photodiode (401, 601) for monitoring the light emission power of the laser light source; —an optical power variation counter for counting optical power variations (605); successive displacements of said mirror allowing the self mixing module providing successive projection distance measurements of a plurality of points of said projection surface. A projection method for optical micro-projection system and a distance measurement method are also provided.

主权项

1. An optical micro-projection system comprising the following components:
at least one light source; at least one movable MEMS mirror for deviating light from said light source to allow generation of images on a projection surface; at least one photodiode for receiving light reflected by said projection surface; a distance evaluation circuit for evaluating a distance between the projection source and a projection surface based on light deviated by said MEMS mirror and received by said photodiode, and for detecting a change in the evaluated distance, due to one or more variations on portions of the projection surface which is/are at different distances from the projection source, wherein the optical micro-projection system further comprises, a means to adjust the at least one light source and the at least one movable MEMS mirror, according to the distance evaluated by the distance evaluation circuit, such that an image projected by the optical micro-projection system can be modified to compensate for said variations on a projection surface so that an undistorted image can be projected on the projection surface, and such that a property of the image projected by the optical micro-projection system, other than the intensity of the image, can be modified in response to a direct physical interaction of a user with a part of the projected image.