Infrared touch screen is formed by installing the outer frame of the circuit board in front of the display, forming an infrared matrix. When the user touches, their fingers will block the horizontal and vertical infrared rays passing through the position, thereby determining the position of the touch point. Infrared touch screens are inexpensive but susceptible to changes in external light. Surface acoustic wave touch screen uses the reflection and attenuation of sound waves on the glass surface to locate touch points. Surface acoustic wave touch screens have high clarity and are not easily damaged, but the surface needs to be cleaned regularly as dust, oil, and other contaminants can affect touch accuracy.

The resistive touch screen connects the internal contacts up and down by pressing, achieving positioning. Resistance screens are not afraid of dust, water, and dirt, and can work in harsh environments, but single touch and are prone to scratches. A capacitive touch screen is a glass screen coated with a transparent thin film layer, forming a low voltage AC electric field. When the user touches, a coupling capacitance is formed between the fingers and the conductive layer, and the position of the touch point is determined by calculating the current ratio and strength. Capacitive screens have high transparency and clarity, but are susceptible to environmental electric fields and may have drift issues.