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Types of VDU

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.

CRT

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.

LCD

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

Plasma display

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.

Difference between 3types

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

More Difference

What is VDU?

  • CRT have no native resolution. Currently, the only display technology capable of multi-syncing (displaying different resolutions and refresh rates without the need for scaling.Display lag is extremely low due to its nature, which does not have the ability to store image data before output, unlike LCDs, plasma displays and OLED displays.
  • The LCD grid can mask effects of spatial and grayscale quantization, creating the illusion of higher image quality.
  • Plasma display,Screen-door effects are more noticeable than LCD when up close, or on larger sizes

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