Touchpad
Due to the ability of trackpads to be made small, they were additionally used on personal digital assistants (PDAs) and some portable media players.Fingers insulated by a glove may also be problematic, and capacitive touchpads are rarely used as pointing devices for medical hardware.Touchpad drivers can also allow the use of multiple fingers to emulate the other mouse buttons (commonly two-finger tapping for right click).Xerox offered the Cat as an alternative input method for selecting strings of text to copy, delete, insert, or move around the document.[10] Introduced a year later, in 1983, the first battery-powered clamshell laptop, the Gavilan SC included a touchpad, which was mounted above its keyboard, rather than below, which became the norm.[11] Psion's MC 200/400/600/WORD Series,[12] introduced in 1989, came with a new mouse-replacing input device similar to a touchpad,[13] although more closely resembling a graphics tablet, as the cursor was positioned by clicking on a specific point on the pad, instead of moving it in the direction of a stroke.One-dimensional touchpads are the primary control interface for menu navigation on iPod Classic portable music players and additional input method on some Wacom digitizer tablets, where they are referred to as "click wheels", since they only sense motion along one axis, which is wrapped around like a wheel.[citation needed] In the matrix approach, a series of conductors are arranged in an array of parallel lines in two layers, separated by an insulator and crossing each other at right angles to form a grid.If a ground point, such as the finger, is placed between the transmitter and receiver, some of the field lines are shunted away, decreasing the apparent capacitance.
MacBookpointing devicegraphical user interfacecomputer screenlaptop computersdesktop computerspersonal digital assistantsportable media playerscapacitive sensingresistive touchscreencapacitancedevice drivermouse clickscroll wheelscrollbarwindowscrollingapplicationApolloGavilan SCMC 200/400/600/WORD SeriesOlivettiTriumph-AdlerCirquePowerBook 500trackballPowerBookMacBook ProSynapticsActionNotepointing stickOptical trackpadBlackBerry Curve 8520Microsoft Surfacelaptopmultitouchcontext menuiPod ClassicCreative LabsMP3 playersMicrosoftZune 80/120Zune 4/8Zune Padgraphics tabletOptical trackpadsiPhone 16, iPhone 16 PlusiPhone 16 Pro and iPhone 16 Pro Maxconductorsinsulatorright anglesvirtual groundshuntedAnalog DevicesTrackpadscomputer mouseAlps ElectricCirque CorporationKaoss PadList of touch input manufacturersMagic TrackpadMulti-touchAckerman, DanPC ComputingYouTubecomputercomponentsInput devicesPointing devicesGame controllerLight penOpticalTouchscreenKeyboardImage scannerGraphics cardMicrophoneRefreshable braille displaySound cardSound chipWebcamSoftcamOutput devicesMonitorScreenPrinterPlotterSpeakersRemovable data storageDisk packFloppy diskOptical discBlu-rayFlash memoryMemory cardUSB flash driveComputer caseCentral processing unitMicroprocessorMotherboardMemoryData storagePower supplyMOSFETPower MOSFETNetwork interface controllerFax modemExpansion cardEthernetThunderboltAnalog audio jackDisplayPortFireWireParallel portSerial portGame portPS/2 portHistory of computing hardwareHistory of computing hardware (1960s–present)List of pioneers in computer science