touch screen An input device that responds to the touch of a stylus, which may be a finger, so that the stylus position on the screen may be estimated. It is thus a touch-sensitive locator. The stylus could be used, say, to make selections from a number of displayed options. A typical touch screen has LEDs and sensors positioned around its outer edges, creating an invisible infrared grid that enables the precise position of a touch to be determined.

touch screen (also touch·screen) • n. a display device that allows a user to interact with a computer by touching areas on the screen.