2. Definition
• 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
3. Types of Tablet PC
• Traditional tablet PCs - A tablet personal
computer (tablet PC) is a portable personal computer
equipped with a touchscreen as a primary input device,
and running a modified desktop OS designed to be
operated and owned by an individual
• Post-PC Tablets – A new tablet computers that
have been introduced with mobile operating
systems which have a different interface instead of
the traditional desktop OS, and represent a new
type of computing device
4. Touch User Interface
Handwriting Recognition
•Because tablet personal computers normally use a stylus,
they quite often implement handwriting recognition.
•Tablet computers with finger driven screens do not have
this feature.
•Finger driven screens however are potentially better suited
for inputting "variable width stroke based" characters, like
Chinese/Japanese/Korean writing, due to their built in
capability of "pressure sensing".
5. Types of Touchscreen
Hardware
A- Resistive touchscreens -
•Passive and can respond to any kind of pressure on the
screen.
•They allow a high level of precision but may require
calibration to be accurate.
•A stylus or fingernail is often used for resistive screens.
•this technology has faded out on high-end devices where it
has been replaced by capacitive touchscreens.
6. Types of Touchscreen
Hardware
B- Capacitive touchscreens
•Tend to be less accurate, but more responsive than
resistive screens.
•Because they require a conductive material, such as a
finger tip, for input, they are not common among (stylus
using) Tablet PCs
•More prominent on the smaller scale "tablet computer"
devices for ease of use, which generally do not use a
stylus, and need multi-touch capabilities.
7. Other Touchscreen Hardware
Technology
• Palm recognition - It prevents inadvertent palms or
other contacts from disrupting the pen's input.
• Multi-touch capabilities, which can recognize
multiple simultaneous finger touches, allowing for
enhanced manipulation of on-screen objects.
• Pressure sensitive films - allow pressure
sensitivity such as those on graphics tablets.
8. Other Features in Tablet PC
• Accelerometer: An accelerometer is a device that detects the
physical movements of the tablet. This allows greater
flexibility of use since tablets do not necessarily have a fixed
direction of use. The accelerometer can also be used to
detect the orientation of the tablet relative to the center of the
earth, but can also detect movement of the tablet, both of
which can be used as an alternative control interface for a
tablet's software.Ambient light and proximity sensors are
additional "senses", that can provide controlling input for the
tablet.
• Storage drive: Large tablets use storage drives similar to
laptops, while smaller ones tend to use drives similar to MP3
players or have on-board flash memory. They also often have
ports for removable storage such as Secure Digital cards.
Due to the nature of the use of tablets, solid-state memory is
9. Other Features in Tablet PC
• Wireless: Because tablets by design are mobile
computers, wireless connections are less restrictive to
motion than wired connections. Wi-Fi connectivity has
become ubiquitous among tablets. Bluetooth is
commonly used for connecting peripherals and
communicating with local devices in place of a wired
USB connection.
• 3D: Following mobile phone, there are also 3D slate
tablet with dual lens at the back of the tablet and also
provided with blue-red glasses.
• Docking station: Some newer tablets are offering a
optional docking station that has a full size qwerty
keyboard and USB port, providing both portability and
flexibility
