Capacitive Touch Communication

Hi friends, imagine that your smartphone,tablet,iPad sense your touch and do not understand the instruction given by other unauthorized user. Wow what a brilliant idea!!!
Yes, it is possible by this newly emerging technology "Capacitive Touch Communication". In this technology the device handled not only sense the authorize touch but if the stranger handles the device it gives signal to the user on wearable device (eg : ring, watch, etc).
It would be of great benefit for the device to know who is interacting with it and occasionally to the authenticate the user. This improves human-computer interface and also improves users experience.The important data like e-mails and personal photos, pay bills, and transfer funds between our bank accounts in the device remains safe from strangers.It saves time and gets easy for finding traces of the person.It is bit costly as it also require wearable device other than mobile device.

There are four different technologies used to make touch screens:

• Resistive
• Capacitive
• Surface Acoustic Wave(SAW)
•  Infrared LED or Optical

 

A capacitive screen in most commercial tablets and smartphones consists of an array of conducting electrodes behind a transparent, insulating glass layer which detects a touch by measuring the additional capacitance of a human body in the circuit.

Fig. 1. Schematic of a basic capacitive touch screen.

Fig. 2.Internal touch detection circuit

This is a system for using a user device to communicate with touch screen of an electronic device generating electronic circuit of user device, a signal by encoding data sequence that is stored in memory of user device.

Architecture:

Fig. 3. Overall architecture of the capacitive touch communication

This technology if very friendly,fast,accurate & easy to operate. Further this can be adopted by computer since it is innovative.