WHAT IS A VIRTUAL KEYBOARD?
       A  Virtual  Keyboard  is  a  projection  keyboard 
         that is projected and touched on any surface.
         A  virtual  keyboard  consists  of  a  laser  that 
         projects  an  image  of  a  keyboard  onto  a  flat 
         surface which can then be typed on as if it were 
         actually there.
        The keyboard watches your fingers movements 
         and  translates  that  action  into  keystrokes  in 
         the device.
                           PONDICHERRY ENGINEERING COLLEGE, PUDUCHERRY                   2
      The  Virtual  Keyboard 
         attaches  to  handhelds 
         and projects the image 
         of  a  full-size  keyboard 
         onto the surface of the 
         desk            where             the 
         handheld  is  placed, 
         allowing  the  user  to 
         input  text  without  a 
         physical keyboard.
                           PONDICHERRY ENGINEERING COLLEGE, PUDUCHERRY                   3
      FEATURES
       For the first time mobile device users can 
         actually type normally on a virtual keyboard , 
         enabling them to work quickly and effectively, 
         taking the pain and frustration out of existing 
         minuscule keyboards and handwriting 
         recognition software.
       Provide multilingual text input mechanism.
       Size is about a fountain pen.
       No physical appearance.
       It takes up less desk space than a conventional 
         keyboard 
                           PONDICHERRY ENGINEERING COLLEGE, PUDUCHERRY                   4
      COMPONENTS OF VIRTUAL KEYBOARD
     This system consists of three modules,
                            
                           1.The sensor module,
                         2.IR-light source and
                  3.The pattern projector
                       PONDICHERRY ENGINEERING COLLEGE, PUDUCHERRY         5
        SENSOR MODULE:
               The Sensor Module serves as the eyes of 
          the   Keyboard Perception technology. 
              The  Sensor  Module  operates  by  locating 
          the  user's  fingers  in  3D  space  and  tracking 
          the intended keystrokes. 
        INFRA RED LIGHT SOURCE
          
              An invisible infra-red beam is projected 
          above  the  virtual  keyboard.  Finger  makes 
          keystroke  on  virtual  keyboard.  This  breaks 
          infrared beam and infrared light is reflected 
          back to projector. 
                           PONDICHERRY ENGINEERING COLLEGE, PUDUCHERRY                   6