virtual laser keyboards
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jisna sukumaran
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Joined: Feb 2011
13-02-2011, 11:33 PM

i am jisna doing b tech(3rd year). i would like to do a mini project and implimentation on virtual laser keyboards. i am not getting the required block diagram and information about the same... please help me out..
seminar project
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01-05-2011, 06:54 PM

you can refer these pages to get the details on virtual laser keyboard

http://www.seminar and presentationproject and

http://www.seminar and presentationproject and
seminar addict
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17-01-2012, 10:02 AM

to get information about the topic Virtual Laser Keyboards full report ,ppt and related topic refer the link bellow and presentation-report and presentation-report?page=3
project girl

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24-12-2012, 02:11 PM


.docx   VIRTUAL LASER.docx (Size: 59.1 KB / Downloads: 12)


Virtual laser keyboard is device which project and implimentation QWERTY full sized keyboardon flat surface for user to work on .The operation of virtual laser keyboard is very much similar with traditional keyboards.
The virtual laser keyboard device emits two laser beam. One beam is used for the project and implimentationion of keyboard image and the other beam is for sensing the touched keys.
The beam used for the project and implimentationion of keyboard image could be seen by us.
The beam used for the sensing the key stroke is invisible infrared beam.
This is a small portable device. The technology has many application in many high-tech and industrial sector. This include data entry and control panel application in hazardous and harsh environment.



The working of QWERTY keyboard is as follows:
(a) When a key is pressed a conductive contact on underside of the dome toches a pair of conductive line on circuit below.
(b)The gap between upper part of the key and lower part ,that is , the circuit complete and the current flows.
© A scanning signal is emitted by the chip along the pair of line to all the keys.when the signal in one pair become different,chip generate the code corresponding to the key stroked.
(d)The code generated is sent to computer via cable using ON OFF electrical signalling to represent the bits
(e) A chip inside the computer receives the signal bits and decode them im appropriate key stroke


A pattern of the desired interface is project and implimentationed onto the adjacent interface surface. The template is produced by illuminating a specially designed, highly efficient holographic optical element with a red diode laser.
The pattern serves only as a reference for the user and is not involved in the detection process. In a fixed environment, the template can just as easily be printed onto the interface surface.


An infra-red plane of light is generated just above, and parallel to, the interface surface. This light is invisible to the user and a few millimeters above the surface.
When the user touches a key position on the interface surface light is reflected from this plane in the vicinity of the key and directed towards the 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.
The micro-controller in the sensor module receives the positional information corresponding to the light flashes from the sensor processing core, interprets the events and then communicates them through the appropriate interface to external devices.
In qwerty keyboard we use electrical signals while in virtual keyboard we
use infrased light signal for the detection of the keystroke.


(a) The size of virtual keyboard is small .The small size of it make it potable.
(b) It can be useful in places where low noise is required like operation
©useful in places where the area for working is very less.


(a) The key board is hard to use because it involves typing in the air.
It creates problem for touch typist.
(b) It is very costly.
seminar tips
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11-02-2013, 09:58 AM

to get information about the topic Virtual Laser Keyboards full report ,ppt and related topic refer the link bellow and presentation-report and presentation-report?page=3

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