Some Analysis on the Principles and Basic Knowledge of Touch Screen There are currently several types of touch screens, they are: resistive (double layer), surface capacitive and inductive capacitive, surface acoustic wave, infrared, and bending wave, active digital converter and optical imaging . They can be divided into two types, one type requires ITO, such as the first three touch screens, and the other type does not require ITO in the structure, such as the latter types of screens. Touch screens can be seen everywhere around us. In the field of personal portable devices such as PDAs, touch screens save space and are easy to carry, and have better human-computer interaction. There are currently several types of touch screens, they are: resistive (double layer), surface capacitive and inductiv…