KENBI series touch screen working principle is to apply the infrared technology on touch panels that place infrared receivers and CRT utilizing infrared Light Emitting Diode(LED) along the horizontal and vertical X-Y axis. When a user touch the surface of the screen, the infrared emitted from LED beam is broken and receiver transmits X-Y axis information to the PC port via touch controller. Note: we are producing all kinds of touch screen from 15 inches to 150 inches. Please let us know if you are interested in our products.