In terms of screen material, what do infra-red optical touch screens utilize?

Infra-red optical touch screens operate by using a grid of infrared light beams that are projected across the surface of the screen. When an object, such as a finger, interrupts these beams, the system detects the location of that interruption, allowing for touch input.

Using toughened glass as the screen material is advantageous because it provides durability and resistance to scratches, which is essential for a surface that will be touched frequently. Toughened glass also ensures that the infrared beams can pass through without distortion, maintaining efficient and accurate touch detection. Moreover, toughened glass can withstand impacts better than other materials, making it an excellent choice for devices that are used in various environments.

Other materials, such as flexible plastic or standard acrylic, may not offer the same level of clarity, durability, and impact resistance that toughened glass does. Sheet metal is not suitable for touch screens as it would obstruct the infrared beams entirely rather than allowing for their passage, making it not feasible for touch detection technology. Thus, the choice of toughened glass is critical in ensuring both functionality and longevity in infra-red optical touch screens.