The Multi-touch Technology Research Based On Infrared

Whether it is a touch screen mobile phone, or in the subway unmanned self-service ticketing system terminals, touch technology is everywhere.With the increasingly wide range of applications, the way of the touch is increasingly demanding.People are no longer satisfied merely with a simple finger on the screen to slide to slide, but the pursuit of multiple fingers switch a program, this multi-point touch gradually changing our way of life.However, it is multi-touch technology that is still widely used mainly resistive touch screen or a capacitive touch screen. Since these two types of touch screen technology and materials present their own problems, so the two types of touch screen in large size can not be produced.For large-size touch screen applications, the key has infrared touch screen based.The infrared touch screen touch technology, far behind the resistive touch screen or a capacitive touch screen, and because the infrared touch screen itself has susceptible to light interference and other defects, resulting the problem in a multi-touch.After a long investigation and analysis of experimental data, it is that the infrared touch screen multi-touch technology solutions, not just as before-alone software algorithm analysis to resolve.This article argues that when the system is designed taking into account the software and hardware design, the two complement each other, complement each other, from the system level to consider and resolve the problem.It is based on the idea that it is the MCU that STM32use the current popular micro-processing chip, and has external interfaces, in order to greatly simplify the external drive circuit.This hardware feature is the infrared emission control circuit, the infrared emission control for packet processing, in order to simplify the software design of the external pressure, to have more time to be responsible for part of the algorithm.In the software part of the design, the feature has the superiority that is the respect of basic mathematical principles, bases on the experimental data more to go through the improved algorithm, in order to program design can truly fit in the actual situation.