The light pen is used to draw objects on a CRT computer screen. They are also used to display objects over computer devices.
A light pen is called so because it is a handheld input device that can detect light on a computer screen. It uses a photocell to detect the presence of light emitted by the screen, allowing it to function as a pointing device.
The principle is the infrared light source that is inside. It takes all of the colors in the spectrum and uses them to make the light work.
a pen light :)
function of light pen
A pen uses ink while a pencil uses lead.
Light Pen is an input Device.
Light Pen is an input Device.
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A light pen typically contains a light sensor that detects light emitted from a computer screen. When the pen is pressed against the screen, the sensor registers the light and communicates with the computer to determine the pen's position on the screen.
technical PEN.
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT TV set or 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. A light pen can work with any CRT-based display, but not with LCD screens (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan[1]), projectors and other display devices. 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.
Mouse or light pen