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The most common VDU unit types are CRT, LCD and plasma displays.
Short for Visual Display Unit, VDU is an older British term used to describe any device used with computers to display images. For example, a flat panel display, and a projector are both examples of VDUs. However, VDU is most commonly used to describe the now archaic standard CRT monitor.
A cathode ray tube (CRT) monitor is an analog computer display or television set with a large, deep casing. This type of monitor uses streams of electrons that activate dots or pixels on the screen to create a full image. In contrast to this, liquid crystal display (LCD) monitors and plasma television sets, or flat panel displays, use newer digital technologies. While flat-screens have become increasingly popular, there are still some advantages to CRT models that can make them better for some situations.
A liquid-crystal display (LCD) is a flat panel display, electronic visual display, or video display that uses the light modulating properties of liquid crystals. Liquid crystals do not emit light directly
A plasma display panel (PDP) is a type of flat panel display common to large TV displays 30 inches (76 cm) or larger. They are called "plasma" displays because they use small cells containing electrically charged ionized gases, which are plasmas.
LCD
Plasma display
CRT
Over 15,000:1
Contrast
68 × 109
Color depth
60 fps typically, some can do 120 fps;
internally, display refreshed at eg. 480 or 600 Hz
60–85 fps typically, some CRTs can go even higher
internally, display refreshed at input frame rate speed
frane rate
Up to 150"(3.8m)
Size
Energy consumption and heat generation
Varies with brightness but usually higher than LCD
High
Low