Computersight -

TOUCHSCREEN SYSTEMS:-

                A typical touch screen input system is basically an input device like a mouse or track pad. A touch screen is a computer display screen that is sensitive to human touch allowing a user to interact with the computer by touching pictures or words on the screen. A touch screen system is made up of a touch sensor, a controller card, and a software driver.

WHAT ARE TOUCHSCREEN USED FOR?

                Touch screens are used with information Kiosks, computer-based training devices, and systems designed to help individual who have difficulty manipulating a mouse or keyboard. Touch screen systems are begin used in a variety of applications, including point-of-sale systems, public information displays, industrial control systems, and more. There are a number of types of touch screen technology:

RESISTIVE:

                A resistive touch screen panel is composed of several layers. When some object touches this kind of touch pannel, the layers are connected at certain point which registers a touch event and sendit to the controller for processing. Resistive touch screen panels are not affected by dust or water and are the type most commonly used today.

SURFACE ACOUSTIC WAVE:

               Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is absorbed. This information is sent to the controller for processing.

CAPACITIVE:

               A Capacitive touch screen panel is coated with indium tin oxide that conducts a continous electrical current across the sensor. When the sensor’s ‘normal’ reference state is altered by someone’s finger, electronic circuits measures the resultant ‘distortion’ and informs the controller for processing.

INFRARED:

              This method uses an array of vertical and horizontal IR sensors that detect the interruption of a modulated light beam near the surface of the screen.