Light Pen – Input Unit/Devices

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Computer Light Pen- Computer Fundamental- mLand India Technologies

A Light Pen is a input device, which is a light-sensitive pointing input device commonly used to select or otherwise modify text or data on a screen. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy. Used with a CRT monitor, these devices were an early form of manipulating and highlighting data on the screen.

Who Is Inventor Of Light Pen?

The first Light Pen was invented by Ben Gurley in 1959. The basic idea for the computer mouse came to Douglas Engelbart in 1961, while he was attending a computer graphics conference.

How Does Lightpen Work?

A Light Pen detects a change of brightness of nearby screen pixels when scanned by cathode ray tube electron beam and communicates the timing of this event to the computer.

What Are The Advantages Of A Lightpen?

Advantages of a light pen:
  1. The Light Pen allows you to select any object on the display screen directly.
  2. The Light Pen does not need any screen coating.
  3. A Light Pen is very useful for fine selection and drawing.
  4. A Light Pen is accurate as it draws directly on the display screen.

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