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Monitor

Computer monitor1.Alternatively referred to as a video display terminal (VDT) and video display unit (VDU), a monitor is a device that displays video images to the user. A monitor is made up of circuitry, a screen, a power supply, buttons to adjust screen settings, and casing that holds all of these components.

Like most early TVs, the first computer monitors were comprised of a CRT (Cathode Ray Tube) and a fluorescent screen. Today, all monitors are created using flat panel display technology, usually backlit with LEDs. The image to the right shows an ASUS LCD monitor.

When was the first computer monitor invented?

The first computer monitor was part of the Xerox Alto computer system, which was released on March 1, 1973.

Why is a monitor an output device?

A monitor is only used to display (output) information from a computer and provides no source of input. For this reason, a computer monitor is considered an output device.

Note: Newer PCs have touchscreen monitors, which allow the user to interact with their computer by touching what is shown on the screen with their finger. If the monitor has touchscreen capabilities, it is considered an Input/Output devices.

2.Monitor is a term used to describe the act of watching over someone or something.

3.A resident monitor was system software used with machines utilizing punch card input. Resident monitors came before, but was very similar to, an operating system.

Also see: Display, Output device, RGB monitor, Security terms, Video terms, CRT