The crystals align themselves so that light cannot pass, producing an image on the screen. In LCDs, an electric current passes through a liquid crystal solution that is trapped between two sheets of polarizing material. Many handheld and portable computers include flat panel displays (FPDs) that use LCD or gas plasma technologies. Pocket PCs have one or more expansion slots for added memory. 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. They may also provide handwriting recognition and voice recognition technologies. Typically, PDAs function as a cellular phone, fax sender, Web browser, and personal organizer. Personal digital assistants (PDAs) are smaller than tablet PCs, but also include a stylus or keyboard. Tablet PCs digitize handwriting and often include a keyboard or mouse. 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. There are three basic types of handheld and portable computers. They also provide an operating system, user interface, and battery power. They contain a processor, memory, I/O ports, and expansion slots. Handheld and portable computers are small, lightweight computers that are designed to be operated while held by hand or from a desk or tabletop.

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