Definition of light pen in English:

light pen

Syllabification: light pen


1 Computing A handheld, penlike photosensitive device held to the display screen of a computer terminal for passing information to the computer.
More example sentences
  • You may have to adjust the brightness of your monitor to get your light pen to work properly.
  • Various other light pens have been developed which include a lens for focusing the axially received light.
  • The radiated light is directed so as to be projected from a tip of the light pen as required.
2A handheld, light-emitting device used for reading bar codes.

Definition of light pen in:

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