A touchscreen is a display that doubles as an input device, sensing where a finger or stylus touches its surface — the defining interface of modern phones and tablets.1
Overview
Most modern touchscreens are projected capacitive: a grid of transparent electrodes detects the tiny change in capacitance a fingertip causes, enabling fast, accurate multitouch (pinch, swipe, two-finger gestures). Older resistive panels sense pressure where two conductive layers meet — cheaper and usable with gloves or any stylus, but single-touch and less responsive. The panel is laminated over an LCD or OLED display, and a controller reports touch coordinates to the mobile OS.
Where it fits
The touchscreen is what let phones drop physical keyboards and become all-screen devices; it is equally central to tablets, e-readers, smartwatches, and the inner display of a foldable phone. For a field setup, a small touchscreen on a Raspberry Pi next to the antenna can give a GopherTrunk capture node a self-contained local display without a separate keyboard or mouse.
Sources
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Touchscreen — Wikipedia, on capacitive and resistive touchscreen technology. ↩