A laser projector configured to project an image to a back side of a 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 a 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 so as to recognize that there is a touch input at a position of the screen where the scanner emits the infrared light; and a controller configured to control operations of the light source, the infrared light emitting device and the scanner and to recognize a touch input based on the reflected infrared light detected by the detector, characterized in that 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, wherein the unit pixel time is the time taken for the infrared light to move from one pixel to the next pixel, wherein the controller is configured to determine that the infrared light detected by the detector is the infrared light reflected by the object approaching the screen when a frequency and a waveform of the infrared light detected by the detector are corresponding to a frequency or a waveform of the infrared light emitted from the infrared light emitting device, and wherein the infrared light emitted from the infrared light emitting device is irradiated toward the screen by the scanner, with the synthesized light by the light synthesis system. 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 a 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 so as to recognize that there is a touch input at a position of the screen where the scanner emits the infrared light; and a controller configured to control operations of the light source, the infrared light emitting device and the scanner and to recognize a touch input based on the reflected infrared light detected by the detector, characterized in that 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, wherein the unit pixel time is the time taken for the infrared light to move from one pixel to the next pixel, wherein the controller is configured to determine that the infrared light detected by the detector is the infrared light reflected by the object approaching the screen when a frequency and a waveform of the infrared light detected by the detector are corresponding to a frequency or a waveform of the infrared light emitted from the infrared light emitting device, and wherein the infrared light emitted from the infrared light emitting device is irradiated toward the screen by the scanner, with the synthesized light by the light synthesis system.