For common use as a pointer device, the dragging motion of a finger is translated into a finer, relative motion of the cursor on the output to the display on the operating system, analogous to the handling of a mouse that is lifted and put back on a surface. Like touchscreens, touchpads sense absolute position but their resolution is limited by their size. Fingers insulated by a glove may also be problematic, and capacitive touchpads are rarely used as pointing devices for medical hardware. ![]() Capacitance-based touchpads will not sense the tip of a pencil or other similar ungrounded or non-conducting implements. The most common technology used in the 2010s senses the change of capacitance where a finger touches the pad. Touchpads operate in several ways, including capacitive sensing or resistive touchscreen. Wireless touchpads are also available, as detached accessories. Because trackpads can be made small, they can be found on personal digital assistants (PDAs) and some portable media players. Trackpads are sometimes used on desktops, where desk space is scarce. Touchpads are common on laptop computers, contrasted with desktop computers, where mice are more prevalent. Its largest component is a tactile sensor: an electronic device with a flat surface, that detects the motion and position of a user's fingers, and translates them to a position on a screen, to control a pointer in a graphical user interface. Closeup of a touchpad on a MacBook 2015 laptop.Ī touchpad or trackpad is a type of pointing device. ![]() Type of pointing device Closeup of a touchpad on an Acer CB5-311 laptop.
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