Light-pen meaning

(computing) A pen-like device allowing a computer user to interact with the screen display.
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A hand-held, pen-shaped electronic device used to scan images, draw lines, designate points, etc. as on a computer video screen.
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A light-sensitive stylus wired to a video terminal used to draw pictures or select menu options. The user brings the pen to the desired point on screen and presses the pen button to make contact. Contrary to what it looks like, the pen does not shine light onto the screen; rather, the screen beams into the pen. Screen pixels are constantly being refreshed. When the user presses the button, the pen senses light, and the pixel being illuminated at that instant identifies the screen location.
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A small, photosensitive device connected to a computer and moved by hand over an output display in order to manipulate information in the computer.
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