The principle of touch screen is that it records and transmits data using light waves. This is done by using a liquid crystal display panel or LED and it can be controlled by using a microprocessor. You can find this technology in many electronic devices like digital watches, calculators, digital camera and so on. The data that is recorded can be changed into any other form as per the need of the device. It is used for industrial purpose, because it can record anything and everything which is seen on the monitor and then transfer it to the other device.
You might be wondering that what is the principle of touch screen is also applicable to the computers and other devices. Yes, it does. But you will not find it in a traditional computer because the screen is fixed and there are no movements to control it. The touch screen is usually placed in a portable device which is brought along when needed.
A common question that is raised against this technology is about the privacy of data that is being collected by the devices. There are various companies which provide this facility of transferring data from one hand to another device with the help of a USB cable. However, this USB port is not visible to anyone and you cannot see what is on the screen of the device.
This has been opposed by several websites as a disturbance to the user. They feel that a person should be able to use a device without disturbing him. But a common user will look at it in another way. He will use it, whether he is watching TV, using a GPS or just taking a nap on the bed. If there is a need to transfer data then you can have this facility because there are other technologies which allow you to do so.
The USB port is the most common of all such technologies. Many of the other manufacturers have started providing this type of technology. They are making their devices compatible with USB ports. Therefore, even if you own a tablet which uses an older type of touch screen then you can use a USB port for connecting it to the latest device which supports USB 2.0 technology.
What is the principle of the touch screen? You should always try and see how a device operates before buying one. In fact, this principle has made the product of phones, tablets, watches and many other devices that we use every day very useful and convenient. If a manufacturer is able to make a touch screen which operates in an easy way then you can always use this for all your device. It will only take a little time to understand how this works and you would not find any difficulty in using it.