Cathode ray tube (CRT) monitor
Color cathode-ray tube (CRT) monitors are used in color display devices such as a color TV receiver and a color display monitor for a terminal of office automation equipment. A CRT applies a high tension voltage and accelerates electrons so that an electron beam emitted from a cathode can crash into a screen coated with phosphor at a high speed. A color cathode ray tube (CRT) typically includes an electron gun, an aperture mask, and a screen. three electron beams are emitted from an electron gun, pass through electron beam passing holes of a mask having a color selection function, and then land on red, green, and blue fluorescent substances of a fluorescent film formed on a screen surface of a panel and excite the fluorescent substances, to form an image. Electromagnetic deflection coils are provided in a yoke around the CRT between the screen and the electron gun assembly. The drive circuitry typically comprises a video amplifier connected to the electron gun assembly. The screen may be a luminescent screen. Luminescent screens typically comprise an array of three different color-emitting phosphors (e.g., green, blue and red) formed thereon. Each of the color-emitting phosphors is separated from another by a matrix line. Cathode ray tube (CRT) designs have been the predominant display technology on the market for their advantages and low cost. However, for many applications, CRT monitors have present advantages in terms of superior color resolution, contrast and brightness, wide viewing angles, fast response times, and low cost of manufacturing. As digital technology is advancing and the internet is popular, the application or plane display are varied from portable consumer products to large-scale panel for information advertisement, even the very large-scale panel for video communication. Therefore, the general cathode ray displays are not sufficient for these applications. This requirement has led to the development of flat panel displays rather than cathode ray tubes (CRT). Such flat panel monitors include a liquid crystal display (LCD), a field emission display (FED), an electroluminescent display, a plasma display panel (PDP), etc.
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