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Computer Input Device: Light Pen
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LIGHT PEN
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An input device that utilizes a light-sensitive detector to select objects on a display screen. A light pen is similar to a mouse, except that with a light pen you can move the pointer and select objects on the display screen by directly pointing to the objects with the pen.
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wand used in conjunction with the computer's CRT monitor.
A light Pen is a computer input device in the form of a light-sensitive wand used in conjunction with the computer's CRT monitor. It allows the user to point to displayed objects, or draw on the screen, in a similar way to a touch screen but with greater positional accuracy.
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A light pen is fairly simple to implement
A light pen can work with any CRT-based screens, but not with LCD monitor, projectors and other display device. A light pen is fairly simple to implement The light pen works by sensing the sudden small change in brightness of a point on the screen when the electron gun refreshes that spot. By noting exactly where the scanning has reached at that moment.
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