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(Or "trackpad") A stationary pointing device used mainly on laptop computers. Touchpads provide a small, flat surface that you slide your finger over using the same movements as you would a mouse. They were originally developed to provide a more natural and intuitive connection for the computer user than the mouse.

Touchpads use a principle called coupling capacitance, and requires a conductive pointer such as a finger. They contain a two-layer grid of electrodes which are connected to an integrated circuit (IC) mounted under the pad. The upper layer contains vertical electrode strips while the lower layer is composed of horizontal electrode strips. Capacitance from each of the horizontal electrodes to each of the vertical electrodes is measured by the IC. A finger near the intersection of two electrodes modifies the capacitance between them, since a finger has very different dielectric properties than air. The position of the finger is precisely determined based on these changes at various locations.

According to one correspondent, you can use any part of your body, which is not surprising, but not a McDonalds Chicken McCrispy. You can use reheated Pizza Hut Christmas Pizza though.



(1) See HP TouchPad.

(2) The built-in pointing device on all laptop and netbook computers. Also called a "trackpad," the touchpad provides a small, flat surface to slide one's finger over. Residing below most touchpads, two physical buttons emulate the left and right mouse buttons; however, the touchpad surface can often be tapped as a substitute for pressing the left button. In addition, either the entire touchpad area or only one side of the surface may be used to emulate the mouse's scroll wheel.

Multitouch Touchpads
Popularized by Apple's Magic Trackpad, newer multitouch devices accept gestures from two or more fingers to activate common functions such as scrolling, next page, previous page and zoom. See mouse, trackball, pointing stick and Magic Trackpad.

The touchpad became standard on laptops, but external units for desktop computers are also available (see Magic Trackpad).
References in periodicals archive ?
Through stringent testing, Synaptics' advanced image sensing technology and drivers are fully certified with Microsoft's Precision TouchPad (PTP) specification empowering OEMs with Windows 10-ready Synaptics products.
The Microchip 3D TouchPad, available from Mouser Electronics, allows developers to evaluate the Microchip MGC3130 3D Tracking and Gesture Controller, one of the industry's first electrical field based three-dimensional tracking and gesture controllers.
Leveraging Synaptics' Precision TouchPad solution, Microsoft's latest Type Cover keyboard, features a 5mm ultra-thin form factor, smoother scrolling, improved pinch-to-zoom, and consistent uniformity of experience for seamless TouchPad interaction.
The touchpad itself looks like a larger version of what you would expect to see on a laptop and is located to the right of the physical keyboard.
Also, the touch area is significantly larger than a built-in laptop touchpad and the touchpad also supports up to 13 Windows 8 multi-touch gestures with the download of Logitech SetPoint software.
The Touchpad, which is activated by placing one, two, or three fingers on the pad, depending on whether you want to open a cursor, swipe left or right, or return to the home screen, is part of what Logitech calls "a different view than Microsoft on navigation":
When HP first launched its TouchPad, it shipped without a camera app
HP recently announced it would discontinue the TouchPad, dropping the price to US$99.
The HP TouchPad was vaunted as the iPad killer - a Au340 tablet which could take on the giant.
The Touchpad is the first time it has made it on to a tablet device.
uk/touchpad) and from leading high street retailers including PC World, Curry's, Amazon, Argos, Comet, & Carphone Warehouse, the HP TouchPad WiFi version will retail at [pounds]399 for the 16gb and [pounds]479 for the 32gb .
HP has expanded use of its webOS mobile operating software to include the new TouchPad tablet.