What is the material used for infra-red optical touch screens?

Infra-red optical touch screens typically use glass as the primary material. Glass is chosen because it has a smooth surface that allows for clear visibility, which is crucial for the functionality of these touch screens. The glass surface is essential for housing the infra-red light emitters and sensors that detect touch. When a user touches the screen, it interrupts the infrared light beams, allowing the system to determine the precise location of the touch.

Additionally, glass is durable, resistant to scratches, and maintains high transparency, which helps in providing a clear display. This makes it a suitable choice over other materials like plastic, metal, or wood, which may not meet the necessary durability and clarity requirements for effective touch screen operation.