ITPEC IP April 2023 Question 11

Resistive or capacitive types, operated by touching the screen directly with a finger — a touch panel is a display that is also the input device.

A touch panel lays a sensor over the display, so the user points at what is shown by touching it. A resistive panel detects the pressure that brings two conductive films into contact, so a finger, a glove or a stylus all work. A capacitive panel detects the change in electric charge a finger causes and supports multi-touch gestures such as pinching. Smartphones, ATMs and ticket machines use them.

Answer (d)

Why not others:

• •(a) — a tablet (digitizer): a separate flat plate that detects the position of a pen- or mouse-type device
• •(b) — a touchpad: a flat panel, usually below a laptop keyboard, traced with a finger to move the pointer on a separate screen
• •(c) — a wheel-type device such as a click wheel, operated by rotating a disc-shaped part; the screen itself is not touched

Key rule: A touch panel takes input on the screen itself; a touchpad and a tablet are separate surfaces whose positions are mapped to a pointer on the screen.

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