IPS is based on the computer vision technology. When user pressing the finger on the screen, the image will be captured by the camera inside the sensor. And then the driver program will analyze the image, recognize the finger and translate the physcial position of the finger on the projection screen into the logical coordinate of the computer. Related mouse event will also be sent at the same time. Therefore, it functions to open an interface, switch a scene and look up information by touching the screen with fingers or other finger-like objects.