With the increasing use of computers as information sources, touch screens are characterized by ease of use, robustness, durability, fast response and space saving. More and more, system designers feel that there are considerable advantages to using touch screens. Touch screens have only been on the Chinese market for a few years. This new multimedia device has yet to be reached and understood by many, including some system designers who plan to use touch screens as optional. Judging from the popularity of touch screen in developed countries and the stage of multimedia information industry in China, this concept still has a certain universality. In effect, a touchscreen is a device that makes multimedia information or control look new. It brings a new look to multimedia system and is a very attractive new multimedia interactive equipment. System designers in developed countries and those in China who first use touch screen clearly know that touch screen is no longer an optional device of computer in various application fields, but an indispensable device. It greatly simplifies the use of computers. Even people who know nothing about computers can use their fingertips to make them more attractive. It solves problems in the public information market that computers cannot solve. With the development of the city in the direction of information, computer network in people's life penetration, information query has been achieved through touch screen, that is, display content can be touched.

For ease of operation, people use touch screens instead of a mouse or keyboard. When working, you must first touch the touch screen installed in front of the display with your finger or other objects, and then the system will locate and select the input information according to the position of the icon or menu touched by your finger. The touch screen comprises a touch detection component and a touch screen controller; The touch detection component is installed in front of the display screen, detect the user's touch position, and then send it to the touch screen controller; The main function of the touch screen controller is to receive contact information from the contact detection device and convert it into contact coordinates, and then send it to the CPU. It can also receive and execute the commands sent by the CPU.