GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Computer monitor, X-ray. This type of computer screen is also known as a VDU (visual display unit). It is a CRT (cathode ray tube), which uses the same technology as that used in colour televisions. The electronic circuits (lower centre) and a plastic support stand (bottom centre) are seen. The circular structure at centre is the CRT that fires electrons onto the back of a phosphor coated screen, which forms the image.
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