<p>A multi touch screen using the infrared camera is provided to simplify the calculating processing by using the binary coder method and a plurality of touch points. The body(100) is formed in the front of the multi touch screen. The screen surface(110) is formed in the body. The projector(300) is formed in the body In order to send out the image to the screen surface by using a plurality of back mirrors. The infrared camera(400) is separated from the projector to sense the infrared ray reflected on the screen surface. The infrared ray is reflected by the object which is transmitted by one or more infrared radiation.</p>
