Tablet PC

A tablet computer, or a tablet, is a mobile computer, larger than a mobile phone or personal digital assistant, integrated into a flat touch screen and primarily operated by touching the screen rather than using a physical keyboard. It often uses an onscreen virtual keyboard, a passive stylus pen, or a digital pen.

Apple Ipad 2 

The term may also apply to a variety of form factors that differ in position of the screen with respect to a keyboard. The standard form is calledslate, which does not have an integrated keyboard but may be connected to one with a wireless link or a USB port. Convertible notebook computers have an integrated keyboard that can be hidden by a swivel joint or slide joint, exposing only the screen for touch operation. Hybridshave a detachable keyboard so that the touch screen can be used as a stand-alone tablet. Booklets include two touch screens, and can be used as a notebook by displaying a virtual keyboard in one of them.

Early examples of the information tablet concept originated in the 19th and 20th centuries mainly as prototypes and concept ideas, the more prominent the Alan Kay's Dynabook. First commercial portable electronic devices based on the concept appeared at the end of the 20th century. During the 2000s Microsoft attempted a relatively unsuccessful product line with Microsoft Tablet PC, which carved a niche market at hospitals and outdoor businesses. In 2010 Apple released the iPad based on the technology developed in parallel with their previous iPhone, and reached worldwide commercial success.

Samsung Galaxy Tab

Advantages

• Usage in environments not conducive to a keyboard and mouse such as lying in bed, standing, or handling with a single hand.
• Lighter weight, lower power models can function similarly to dedicated reading devices like the Amazon Kindle.
• Touch environment makes navigation easier than conventional use of keyboard and mouse or touch pad in certain contexts such as image manipulation, musical, or mouse oriented games.
• Digital painting and image editing are more precise and intuitive than painting or sketching with a mouse.
• The ability for easier or faster entry of diagrams, mathematical notations, and symbols.
• Allows, with the proper software, universal input, independent from different keyboard localizations.
• Some users find it more direct and pleasant to use a stylus, pen or finger to point and tap on objects, rather than use a mouse or touchpad, which are not directly connected to the pointer on screen.

Android Tab

Disadvantages

• Higher price – convertible tablet computers can cost significantly more than non-tablet portable PCs although this premium has been predicted to fall.
• Input speed – handwriting or typing on a virtual keyboard can be significantly slower than typing speed on a conventional keyboard, the latter of which can be as high as 50–150 WPM; however, Slideit, Swype and other technologies are offered in an effort to narrow the gap. Some devices also support external keyboards (eg: iPad can accept Bluetooth keyboards and USB keyboards through iPad Camera Connection Kit Dock Connector-to-USB adapter. Apple has also released a keyboard dock)
• Ergonomics – a tablet computer, or a folded slate PC, does not provide room for a wrist rest. In addition, the user will need to move his or her arm constantly while writing.
• Weaker video capabilities – Most tablet computers are equipped with embedded graphics processors instead of discrete graphics cards. In July 2010, the only tablet PC with a discrete graphics card was the HP TouchSmart tm2t, which has the ATI Mobility Radeon HD5450 as an optional extra.
• Business-oriented tablet personal computers have been slow sellers from 2001 to date.
• Screen risk – Tablet computers are handled more than conventional laptops, yet many are built on similar frames; in addition, since their screens also serve as input devices, they run a higher risk of screen damage from impacts and misuse.
• Hinge risk – A convertible tablet computer's screen hinge is often required to rotate around two axes, unlike a normal laptop screen, subsequently increasing the number of possible mechanical and electrical (digitizer and video cables, embedded WiFi antennas, etc.) failure points.
• Smaller display and lack of keyboard.