HOW IT WORKS
When a user touches the sensor on the touch panel with his finger, the input will be registered as an analog signal. The signal is converted into a digital signal by a controller in order for the computer to recognize the signal. The touch driver in the computer integrates various components to compile the digital signal in order for the video card to render the position of the touch event on the display.
Based on their structures and types of input sensing formats, touch screens can be divided into the following types: resistive touch screen, capacitive touch screen, SAW touch screen, optical touch screen, and electromagnetic digitizer
At present, the most extensively used controller for touch screens is the USB port controller. The function of a controller is to receive the analog signal from the sensors and convert it to a digital signal in order for the drivers to interpret the signal. Touch screen applications can offer an assortment of different usages through the design of touch drivers and functions. For example, the interface could be presented in different languages to make the operation easier for users of other nationalities; handwriting recognition, multi-screen system support, PC game support could also be added to enhance the touch screen's added value. Not only that, the operating software could also be custom designed according to clients' needs.