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what is a computer monitor?

A visual display unit, often called simply a monitor or display, is a piece of electrical equipment which displays images generated from the video output of devices such as computers, without producing a permanent record. A newer monitor typically consists of a TFT LCD, with oldest monitors based around a cathode ray tube (CRT). The monitor comprises the display device, simple circuitry to generate and format a picture from video sent by the signals source, and usually an enclosure. Within the signal source, either as an integral section or a modular component, there is a display adapter to generate video in a format compatible with the monitor.
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A data entry clerk is comfortable with the monitor about 30 inches from his eyes. The company's ergonomic guidelines, however, say viewing distance should be from 18 to 24 inches. A member of his company's ergonomics committee says that the viewing distance should conform to the guidelines.
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