Infrared touch technology (also known as IR) is the most widely used in touch-screen commercial applications and has been the industry standards for decades. Using IR technology means that no actual contact with the screen is required so less damage is incurred over time. It works by embedding LED lights and sensors into the bezel of a monitor above the glass. These LEDs beam a signal across to the corresponding sensor on the other side forming an invisible grid. When the grid is broken by a finger, or other solid objects, enabling the sensors to detect the touch points. This is shown in the diagram below.