smart board 800 installation.Touch screens are widely used in various areas of our daily life, such as mobile phones, media players, navigation systems, digital cameras, digital photo frames, PDAs, gaming devices, displays, electrical controls, medical devices, and more. The mainstream touch screen is divided into a resistive touch screen, a capacitive touch screen, a surface acoustic wave type touch screen, an infrared type touch screen, and the like. Among them, the infrared type and capacitive touch screen can support multi-touch. The former is not able to meet the requirements of consumer products due to size limitation and linearity, and the capacitive touch screen has a relatively low cost and good linearity. And operability is the current mainstream multi-touch technology. In real life, we are most exposed to resistive touch screens, which have been widely used in mobile phones and portable digital products as ffi. But capacitive touch screens will become a trend to replace resistive touch screens.