Virtual Keybord

8/8/2019 Virtual Keybord

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VIRTUAL KEYBOARD

By,

Ajay G Jivani

( GLS ICT )


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QWERTY Keyboard

In this row the first key is the Q and the second is

W, the third one is the E, the fourth one is the R,the fifth one is the T and the last one is the Y.

Combining all these keys form a word called

QWERTY.

Before going ahead we

should know what

QWERTY keyboard is.

If you have notice that

the upper row of the

keyboard contains some

keys.


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Why Virtual Keyboard?

In the fast moving lane oftechnology, everything seemsto be going virtual. This isbound to happen since

individuals want to comfortablysit back, at the same time taketheir daily dose of necessaryactivity into account. That callsfor a lot of innovative products.But products that fit this

grouping are cool only if they'reactually useful, else they aredeficient for this category.


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Today's world is very

compact.

Every things are

becoming tiny andmore reliable using

new technology.

Trend is changing

very quick and thingsare becoming more

comfortable.


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What is Virtual Keyboard ?

A virtual keyboard is

actually a device, which

uses highly advanced

laser technology, toproject a full sized

keyboard on to a flat

surface.

A camera tracks the

finger movements of thetypist to get the correct

keystroke.


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Functionality


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Projection Module

A diffractive patterngenerator is typicallycomprised of a coherent lightsource such as a diode laser,a collimating lens and a

phase hologram patterngenerator as shown ,

1 . Collimating lens

2 . Diode laser

3 . Diffractive optical

element (DOE)

4 . Heat sink


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This structure is moulded from a single piece ofplastic to which the diode laser is actively aligned andfixed in place. The DOE is then snapped into theassembly from the other side without requiring anyadditional alignment. A heat sink (4) is then attachedto the laser diode to complete the assembly.

A picture of the fullyassembled micro-projectormodule is shown in figure.

The entire projectorassembly measures lessthan one cubiccentimetre.


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Sensor Module

Reflected light from user interactions with the interface

surface is passed through an infra-red filter and imaged

on to a CMOS image sensor in the sensor module.

Custom hardware embedded in the sensor chip (theProcessing Virtual Interface Core Track Multiple) then

makes a real-time determination of the location of the

reflected light.

The processing core can TM reflection events

simultaneously and can thus support both multiple

keystrokes and overlapping cursor control inputs.


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Illumination Module

Reference plane illumination (Micro-illumination

Module TM)

An infra-red plane of light is generated just above,and parallel to, the interface surface. This light is

invisible to the user and however a few millimeters

above the surface.

When the user touches a key position on the interface

surface light is reflected from this plane and directed

towards the sensor module.


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System Architecture

This system contain

three main hardware

modules:

(1) 3D optical range

camera

(2) LCD projector

(3) Processing platform


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Specifications Of VKB

DimensionsApproximately 35 x 92 x 25mm (1.38" x 3.6" x 1")

Keyboard ProjectionLight source: Red diode laserKeyboard layout: 63 key / full sized QWERTY layoutKeyboard size: 295 x 95mm projected keyboard sizeKeyboard position: 60mm from VKB unit

RequiredP

rojection surface: Non-reflective, opaqueflat surfaceVisibility: Good contrast up to 600 lux ambientillumination


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Keystroke Sensorambient illumination: works under all standard indoorilluminations up to 600 luxdetection: rate up to 400 characters per minutedetection algorithm: Multiple keystroke supporteffective keystroke: Approximately 2mm

Bluetoothbluetooth spec: bluetooth v1.1 class 2

bluetooth profile supported: HID and SPPrange of frequency: 2.4GHz spectrumtransmission range: 9mnumber of supported passkeys: 5


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Electricalpower source: integrated, 3.6V rechargeable lithium-ion battery.battery capacity > 120 minutes continuous typing

charge Method: Included 100-240V AC wall adapter.

Compatibilitysupport for palm OS 5, pocket PC 2003, windowssmart phone, Symbian OS, and windows98/2000/XP,NT .


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Over view of function keys


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Status of LED

Color Status cause Action

Blinking Blue Virtual keyboard is ready to

pair to a Bluetooth device

Long Flash Blue Virtual keyboard is paired toa Bluetooth device

Blinking Red Virtual keyboards battery is

low

Recharge the virtual keyboard

Solid Red The area of the projectedkeyboard is exposed to direct

sun-shine or some other

source of light

Move the virtual keyboard toa shaded location


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Flow Chart

Hand in a

dark room

Hand in a

brightly lit

room


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Advantages & Disadvantages

ADVANTAGES:

Portability

Accuracy

Speed of text entry

Lack of need for flat or large typing surface

FlexibilityDIS-ADVANTAGES:Short battery life.Lighting conditions In a brightly lit room, the virtualkeyboard is less visible.


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Applications

Personal Digital Assistants

(PDA)

Space saving computers

Laptops

Industrial environments

Transport (Air, Rail,

Automotive)


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General Maintenance

Avoid touching the keyboard sensing receiver window.

Never touch the keyboard projection element.

Avoid exposing the keyboard to moisture or extremetemperatures.

Do not disassemble or try to touch the inside of thedevice.

Do not attempt to charge the device with a differentcharger than the one provided by VKB.

If the windows become dirty clean only with a soft, lintfree dry cloth. Do not use any solvents or cleaners.


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Laser safety precaution

The Virtual Keyboarddevice emits two laserbeams.

According to

international standardvirtual keyboard is safeunder these laser beams.

Goggles are notnecessary to view thekeyboard.


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Conclusion

Virtual Keyboard

is the new Era of

technology in

keyboards and

will popular in

future ..


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THANK YOU

Documents

Virtual Keybord