Patent ID: 9454067
Filing Date: 2016-09-27
CPC Classification: G03B,G06F,H04N

Claim Text:
1. A laser projector configured to project an image to a back side of a screen and to detect a touch input on the screen, the laser projector comprising: a light source configured to irradiate at least one of red, green and blue lights; an infrared light emitting device configured to emit an infrared light to the screen; a light synthesis system configured to synthesize image information comprising color information for each pixel with the light irradiated from the light source so as to emit the synthesized light; a scanner configured to project the synthesized light toward the screen for each pixel; a detector configured to detect a reflected infrared light reflected by an object approaching the screen; and a controller configured to control operations of the light source, the infrared light emitting device and the scanner and to recognize touch input based on the reflected infrared light detected by the detector, wherein the infrared light emitted from the infrared light emitting device is driven at a specific frequency vibrating in a shorter period than a unit pixel time or emitted with a modulated waveform after synthesized from two or more frequencies, and wherein the unit pixel time is a time taken for the infrared light to move from one pixel to the next pixel.