visual display unit

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visual display unit

Computing a device with a screen that displays characters or graphics representing data in a computer memory. It usually has a keyboard or light pen for the input of information or inquiries

visual display unit

[′vizh·ə·wəl di′splā ‚yü·nət]
(electronics)

Visual Display Unit

(hardware)
(VDU, or "video terminal", "video display terminal", VDT, "display terminal") A device incorporating a cathode ray tube (CRT) display, a keyboard and a serial port. A VDU usually also includes its own display electronics which store the received data and convert it into electrical waveforms to drive the CRT.

VDUs fall into two categories: dumb terminals and intelligent terminals (sometimes called "programmable terminals").

Early VDUs could only display characters in a single preset font, and these were confined to being layed out in a rectangular grid, reproducing the functionality of the paper-based teletypes they were designed to replace.

Later models added graphics facilities but were still driven via serial communications, typically with several VDUs attached to a single multi-user computer. This contrasts with the much faster single bitmap displays integrated into most modern single-user personal computers and workstations.

The term "Display Screen Equipment" (DSE) is used almost exclusively in connection with the health and safety issues concerning VDUs.

Working with VDUs - UK Heath and Safety Executive.
References in periodicals archive ?
2005 on the minimum requirements to ensure the health and safety of work with visual display units (referred to in documentation as "Ordinance ?
2005 on the minimum requirements to ensure the health and safety of work with visual display units as well as recommendations of the service Occupational Medicine.
2005 on the minimum requirements for ensuring health and safety at work with visual display units.
8 2005 minimum to ensure health and safety at work with visual display units.
7 of 15 August 2005 on the minimum requirements for ensuring health and safety at work with visual display units.