Enhancing Touchscreen Input Via Finger Identification

With the development of technology, multi-touch technology has been applied in many aspects of life, and brought great convenience of human-computer interaction. However, now the interaction methods and function is still very limited, and in many simple interaction scenarios(e.g. simple character input), it is not so convenient. The essence reason of this phenomenon is that, compared to keyboard and mouse, the information dimensions is much smaller. The finger recognition technology can distinguish which finger doing the corresponding operation, and add an user friendly interaction information dimension, so it can greatly enrich the interactive function, and has very important significance.In this study, a new method is presented to realize through combine Radio Frequency Identification(RFID) and multi touch technology. When a user's finger touch on the screen, the system will locate the position of the finger through multi-point touch technology, and then turn on the corresponding antenna below the screen, and query the RFID tag information bound to this finger, through the contact information and tag information binding to identify the finger. So the system can recognize this finger by binding the touch point with the RFID tag. This means means that each touch point will be given a new property or meaning by being assigned to a certain finger.Based on this new finger identification method, this paper develops an interactive platform by highly integrating touch screen, Liquid Crystal Display(LCD), RFID system. We not only achieve the hardware platform, but also provides the application interface for developers, and several typical applications are discussed. Experimental results show that the horizontal resolution of the system is 18 cm, vertical resolution of 27.5cm, detection height is about 1cm, and average response delay is about 200 ms. And the survey found, users has relatively high degree of recognition, and believe that it makes the operation more convenient by introducing finger recognition.