Virtual Keyboard

2.  A Virtual Keyboard is a form of computer input
device whereby the image of a keyboard is
projected onto a surface.
 When a user touches the surface covered by an
image of a key, the device records the
corresponding keystroke.

3.  An optical virtual keyboard
was invented and patented
by IBM Engineers in 1992.
It optically detects & analyses
finger motions and interprets them.
 In 2002,CANESTA developed a virtual
keyboard using their proprietary "electronic
perception technology". The company
subsequently licensed the technology to
Celluon of Korea.
VIRTUAL KEYBOARD

4.  It takes up less desk space than a
conventional keyboard.
 Can be used with Smart phones, PDAs,
Laptop, Palmtop.
 When connected to your handheld computer
it is more convenient to carry around than
your laptop.

5.  This System Comprises Of 3 Components
 Sensor
 Pattern Projector
 IR Light

6.  The working of virtual keyboard can be
explained in 3 modules.
 Projection Module
 Micro-Illumination Module
 Sensor Module

8.  A template is created of the desired interface
and is projected onto the adjacent interface
surface .
 This template is produced by illuminating a
specially designed highly efficient
holographic optical element with a red diode
laser

9.  An infra-red plane of light is generated just
above, and parallel to the interface surface.
 This light is invisible to the user and hovers a
few millimeters above the surface.
 When the user's finger makes a keystroke on
the virtual keyboard, it breaks the infrared
beam and reflects light back to the projector.

10.  Reflected light from user interactions with the
interface surface is passed through an infra-
red filter and imaged onto a CMOS image
sensor in the sensor module.
 Simply, sensor in the projector picks up
finger movements of the user

11.  Virtual keyboards can be connected to the
computer either through Bluetooth or USB.
 Bluetooth technology also enables the virtual
keyboard for point to multi-point connectivity
with other Bluetooth devices, such as
PCs, PDAs and Mobile Phones.

12.  Portability
 Accuracy
 Speed of text entry
 Flexibility
 Keyboard layouts can be changed by
software
 Compatibility
 Occupies Less Space

13.  It is very costly ranging from 150$ to 200$.
 Requires little practice.
 The room in which the projected keyboard is
used should not be very bright so that the
keyboard is properly visible.
 Relatively poor Battery Life.
 The keyboard utility depends entirely on the
surface on which it is located.

14.  High-Tech and Industrial Sectors.
 Used with PDAs, Smart Phones, Laptop,
Word Processing and Spreadsheets
 As Computer/PDA input
 Gaming Control

15.  In the near future all the input devices will be
changed from conventional to virtual devices.
 It can be also used in 6th Sense Technology
Device and even with 3D Glasses.