Laser image projection with infrared obstacle detection

摘要

An image projection method and an image projector are adapted to shut down the laser beams instantaneously when an obstacle intruding into the projection area of the laser beams is detected. A detection wave is projected onto a display screen 3 along with laser beams for displaying an image and detect the reflection wave of the detection wave reflected from the display screen 3 to find out the obstacle, if any, intruding into the projection area of the laser beams. The laser beams are shut down when the intrusion of the obstacle is detected.