PROJECTION KEYBOARD
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| laser keyboard |
A Virtual Projection Keyboard is a one form of computer device in which the keyboard image is projected on the surface when user press the surface of projected keyboard image the devices record this activity and corresponding keystroke.
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| projected keyboard |
An virtual keyboard firstly invented in 1992 by IBM (International Business machine Corporation). According to IBM technology projected keyboard device optically detect the movement of human hand and fingers on projected keyboard image. A laser projects a virtual image of keyboard over the surface when user keep fingers on projected image a sensor pick the movement of that and software convert the co-ordinates to a character.this keyboards have 4 main steps and modules like projection module, illumination module , sensor module. It also have optical element devices , red laser diode, CMOS (complementary metal-oxide semiconductor) sensor chip and IR(infrared) laser diode.
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| projected keyboard |
This keyboard is connected to the computer through bluetooth or USB cable. because of use of bluetooth it can be connected to the multiple devices i.e mobiles, pc.
Another technique used in virtual projection keyboard detect the characters is device project a invisible beam over a virtual keyboard and whenever user press the key on project image it break the invisible beam and reflect the light back to the projector device this beams passes through the filter and meet to the camera . This camera take photographs of incoming beam lights angle. A sensor is provided which detects from where invisible beam is broken and software determine action and converts to a character.
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