How Virtual keyboard machine's work

Basically, all physical and virtual keyboard, is the input device. While snapping his fingers on top of one button, you instruct the keyboard to convey commands to the computer. So, what distinguishes the VKB with a regular keyboard?Regular keyboard, which is currently stuck in your desktop or laptop, in fact the same as other small computers. If the keyboard is disassembled, you will find a processor and circuitry that are similar to components of other computer innards. Under each key, there are circuit boxes (grid).
Each time you press a button, switch on the bottom button will be closed, and sends a small electrical current through the grid, which will be captured and analyzed by the processor (on the keyboard). Furthermore, the processor will send the information to a computer diolahnya. That's how the regular keyboard.When you type on a VKB, there is no switch involved. Because, in fact, there are no elements that move at all. QWERTY keyboard VKB project images on a flat surface (which does not reflect light) using a red diode laser.
These lasers, similar to a laser pointer that sold at roadside, emitting its rays through the diffractive optical element (DOE) is patterned a keyboard. DOE, along with a special lens, enlarging the image is proportional to the keyboard, and project it on a flat surface.But that's not enough. It takes something to analyze the information you type on the VKB projection. Located at the bottom of the transmitter VKB have infrared diode laser, which fires an infrared beam to form a thin field.Thin field that is not visible, located only a few millimeters above the projection VKB. At the time of typing, you pass your fingers through certain areas of the field of infrared light. A CMOS (Complimentary Metal-Oxide Semiconductor) captures the position of your hands inside the VKB projection area, and a special sensor chip (called Virtual Interface Processing Core) analyzed the flick of your finger over VKB.Still hard to imagine? OK, you've watched the films fight scene featuring jewel thief in a museum, is not it? In the film were shown the thief crept avoid infrared light (which is actually not visible) is poor across emitted in the exhibition room.


Unfortunately, the thief inadvertently exposed to infrared light. Museum security system scans the position of the thief, and report it to the guard post. That's about how the VKB. It's just that the thief is a flick of a finger, and the guard is heading your computer.Pictured, right?