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Handheld and Portable Computers

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About Handheld and Portable Computers

Handheld and portable computers are small, lightweight computers that are designed to be operated while held by hand or from a desk or tabletop. They contain a processor, memory, I/O ports, and expansion slots. They also provide an operating system, user interface, and battery power. There are three basic types of handheld and portable computers. Tablet personal computers (PCs) are notebook computers that feature a liquid crystal display (LCD) on which users can write with a special pen called a stylus. Tablet PCs digitize handwriting and often include a keyboard or mouse. Personal digital assistants (PDAs) are smaller than tablet PCs, but also include a stylus or keyboard. Typically, PDAs function as a cellular phone, fax sender, Web browser, and personal organizer. They may also provide handwriting recognition and voice recognition technologies. Pocket PCs, a third type of handheld and portable computers, are advanced PDAs with low power processors, brilliant trans-reflective color screens, wireless communication features, and many add-on options. Pocket PCs have one or more expansion slots for added memory. 

Many handheld and portable computers include flat panel displays (FPDs) that use LCD or gas plasma technologies. In LCDs, an electric current passes through a liquid crystal solution that is trapped between two sheets of polarizing material. The crystals align themselves so that light cannot pass, producing an image on the screen. LCDs can be monochrome or color. Color displays can use a passive matrix or an active matrix . Passive matrix displays contain a grid of horizontal and vertical wires with an LCD element at each intersection. In active matrix displays, each pixel has a transistor that is switched directly on or off, improving response times. Unlike LCDs, gas plasma displays consist of an array of pixels, each of which contains red, blue, and green subpixels. In the plasma state, gas reacts with the subpixels to display the appropriate color. For both LCDs and gas plasma displays, resolutions include pixel measurements of 160 x 160, 320 x 240, 320 x 320, and 480 x 160. 

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Products & Services Related to Handheld and Portable Computers

Computer Workstations
Computer workstations are client computers that connect to a network and share data with other machines. They are used in applications such as computer-aided design (CAD), computer-aided manufacturing (CAM), graphic design, software development, medical imaging, and point of sale (POS) systems.
Computers
Computers are programmable electronic devices that accept data, execute prerecorded instructions, perform mathematical and logical operations, and output results.
Desktop Personal Computers
Desktop personal computers (PCs) are small, relatively inexpensive computers that are designed for individual users. Typically, these devices include a monitor, keyboard, mouse, and other peripherals.
Industrial Computers
Industrial computers are similar to personal computers (PC), but they are intended for use on a factory floor or in other harsh environments.
Notebook and Laptop Computers
Notebook and laptop computers are portable computers that usually feature integral keyboards and monitors.

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