The document discusses virtual keyboards, which use laser and sensor technology to project a keyboard interface onto any surface. A virtual keyboard consists of a sensor module to track finger movements, an infrared light source to project the keyboard image, and a pattern projector to display the standard QWERTY keyboard layout. Virtual keyboards offer portability by allowing users to type on any flat surface, but lack the tactile feedback of a physical keyboard.

1. VIRTUAL KEYBOARD
By
N.JAYAPRAKASH
12S11D6505

2. INTRODUCTION
 A virtual keyboard is actually a key-in device, roughly a
size of a fountain pen, which uses highly advanced laser
technology.
 Virtual Keyboard is just another example of today’s
computer trend of ‘smaller and faster’.
 Many alternate forms like speech recognition, hand
writing recognition devices had come.
 The new virtual keyboard technology uses sensor
technology and artificial intelligence to let users work on
any surface as if it were a keyboard.

3.  The software and hardware part recognizes the
typed characters and pass it to the computer.
 Virtual Keyboard, being a small, handy, well-
designed and easy to use application, turns into a
perfect solution for cross platform multilingual text
input.

4. QWERTY KEYBOARD
QWERTY is the most common keyboard layout on
English-language computer and typewriter keyboards.
The most common keyboards are:
101-key Enhanced keyboard
104-key Windows keyboard
82-key Apple standard keyboard
108-key Apple Extended keyboard

5. INSIDE KEYBOARD
The processor in a keyboard has to understand
several things that are important to the utility of the
keyboard, such as:
Position of the key in the key matrix.
The speed at which to transmit the typematics.

6. The microprocessor and controller circuitry of a keyboard
A look at the key matrix.

8. VIRTUAL KEYBOARD
Virtual keyboard is just another example of today's
computer trend of smaller and faster.
Virtual Keyboard uses sensor technology and artificial
intelligence to let users work on any surface as if it
were a keyboard.
Virtual Devices have developed a flashlight-size
gadget that projects an image of a keyboard on any
surface and let’s people input data by typing on the
image.

9. The Virtual Keyboard uses light to project a full-sized
computer keyboard onto almost any surface, and
disappears when not in use.
The device detects movement when fingers are
pressed down.

11. VIRTUAL KEYBOARD TECHNOLOGY
This system comprises of three modules:
1. The sensor module
2. IR-light source and
3. The pattern projector

12. • The Sensor Module operates by locating the user's
fingers in 3-D space and tracking the intended
keystrokes, or mouse movements.

13. • The Infrared Light Source emits a beam of infrared light .
• This helps in recognizing the hand movements and the
pressing of keys .

14. • This image can be projected on any flat surface.
• The projected image is that of a standard QWERTY keyboard,
with all the keys and control functions as in the keyboard.
• The Pattern Projector or optional printed image presents the
image of the keyboard or mouse zone of the system.

15. APPLICATIONS OF VIRTUAL KEYBOARD
Foreign character sets.
Touch screens.
Bypass key loggers.
Mobility impairments.

16. Advantages
Portability
Speed of text accuracy
Alternative keyboard layouts
Flexibility
Lack of need for flat or large typing space

17. Disadvantages of virtual keyboard
 Tactile feel
 Space
 Dirty screens

18. CONCLUSION
Virtual keyboard uses sensor technology and artificial
intelligence to let users work on any surface as if it
were a keyboard.
Projection keyboards or virtual keyboard claim to
provide the convenience of compactness with the
advantages of a full blown QWERTY keyboard.

19. Thank you