Tablet computers are notebook computers with a liquid crystal display (LCD) on which the user writes with a special pen called a stylus. These pens of styli can be wireless devices or attached to the tablet computer via cords or wires. There are two basic types of tablet computers: traditional and convertible. Traditional products are more rectangular and permit the use of X-Y coordinate logging and optical character recognition (OCR). Convertible products are thin-framed notebook computers that include a foldout keyboard.
Performance specifications for tablet computers include maximum resolution in lines per inch and maximum sampling rate, the rate at which tablet computers process user inputs. Accuracy, another important product specification, separates various product lines. Notebook computers that perform standard diagnostic tests can alert users about potential performance problems. Serial interfaces for tablet computers include universal serial bus (USB), RS232, and RS422. Parallel interfaces include general-purpose interface bus (GPIB), an 8-bit standard. Tablet computers that use special forms of transistor-transistor logic (TTL) or discrete signals are also available.
Most tablet computers include special tablet computer software, or standard applications that are compatible with popular operating systems (OS). A basic tablet computer may include a simple word processing application. A more device may include productivity software that provides the user with the ability to schedule tasks or create spreadsheets. Reading a tablet computer comparison or performing an on-line tablet computer review is a good way to learn about product features.
There are many applications for tablet computers. An industrial tablet computer can be used by plant workers, machine operators, or inspectors in manufacturing environments. A rugged tablet computer can be used by personnel who work outdoors (e.g., forestry, utilities, and construction), or by emergency personnel such as police officers, firefighters and paramedics. In the commercial sector, tablet computers have become increasingly popular due to increased processor abilities and the development of languages such as Java and Python. A used tablet computer or a refurbished tablet computer is suitable for many applications.