A laser keyboard is the latest in projection technology that wirelessly displays a virtual keyboard outline onto a flat surface, allowing you to type almost anywhere with no cords or bulky equipment. The projector is usually a small device the size of a small phone, which sits a few inches from where you want the laser keyboard to display. The surface that it is projected on has to be non-reflective to avoid inconveniencing the user.
Unlike in the normal keyboards used at home where switches close with every keystroke and translate into a command, the laser keyboards use infrared technology. The device has a small red diode laser that projects a full QWERTY keyboard on a flat surface. The surface should be flat in order to make typing much more easier. If you wish to learn more about this, visit about laser projection.
The conventional keyboard is also known as a QWERTY keyboard because the first letters on the key board are Q, W, E, R, T and Y. The design was adopted from typewriters that have been in use since the late 19th century.
There is usually a diffraction within an optical element placed on the diode that the light shines through. The diffraction through the optical element is a tiny image of a full QWERTY keyboard that is magnified and projected once the light goes on. For magnification to a user friendly size keyboard, special optical lenses are used.
However, this is just a displayed keyboard that cannot help type because it has no means of communicating with the device. To enhance this, an infrared laser diode is placed at the near bottom of the device. The laser diode also projects a thin plane of red light on top of the projection keyboard. They do not overlie each other but are rather millimeters apart.