Infrared Touch Screen Technology consists of infrared emitting and receiving sensing elements mounted on the outer frame of the touch screen. On the surface of the screen, an infrared detection network is formed. Any touching object can change the infrared on the contact to achieve touch screen operation. The implementation principle of infrared touch screen is similar to surface acoustic wave touch, it uses infrared transmitting and receiving sensing elements. These elements form an infrared detection network on the screen surface. Touch-controlled objects (such as fingers) can change the infrared of the contact point, which is then converted into the coordinate position of the touch to achieve the response of the operation. On an infrared touch screen, a circuit board device arranged on four sides of the screen includes an infrared transmitting tube and an infrared receiving tube, correspondingly forming a horizontally and vertically crossed infrared matrix. The infrared touch screen is continuously scanned to detect if infrared rays are blocked by objects and locate the user’s touch.

When there is a touch, a finger or other object will block the horizontal and vertical infrared rays passing through the position. When the touch screen scans and is convinced that one of the infrared rays is blocked, the red light is on, indicating that the infrared rays are blocked. There may be a touch, and immediately change to another Scan the coordinates again. If another infrared axis is also blocked on the other axis, and the yellow light is on, it indicates that a touch was found, and the positions of the two infrared blocking tubes that were found to be blocked will be reported to the host.