cathode ray tube (CRT)
vacuum tube which displays images when an electron beam falls on a phosphorescent surface (this technology is commonly used in computer monitors and televisions) | ||||
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Cathode ray tube definition was found in categories: Computer & Internet(3) Language, Idioms & Slang(2) Entertainment & Music(1) Science & Technology(1) Encyclopedia(1)
Cathode ray tube Definition from Computer & Internet Dictionaries & Glossaries
| FOLDOC |
cathode ray tube
<hardware> (CRT) An electrical device for displaying images by exciting phosphor dots with a scanned electron beam. CRTs are found in computer VDUs and monitors, televisions and oscilloscopes. The first commercially practical CRT was perfected on 29 January 1901 by Allen B DuMont.
A large glass envelope containing a negative electrode (the cathode) emits electrons (formerly called "cathode rays") when heated, as in a vacuum tube. The electrons are accelerated across a large voltage gradient toward the flat surface of the tube (the screen) which is covered with phosphor. When an electron strikes the phosphor, light is emitted. The electron beam is deflected by electromagnetic coils around the outside of the tube so that it scans across the screen, usually in horizontal stripes. This scan pattern is known as a raster. By controlling the current in the beam, the brightness at any particular point (roughly a "pixel") can be varied.
Different phosphors have different "persistence" - the length of time for which they glow after being struck by electrons. If the scanning is done fast enough, the eye sees a steady image, due to both the persistence of the phospor and of the eye itself. CRTs also differ in their dot pitch, which determines their spatial resolution, and in whether they use interlace or not.
(1994-11-17)
<hardware> (CRT) An electrical device for displaying images by exciting phosphor dots with a scanned electron beam. CRTs are found in computer VDUs and monitors, televisions and oscilloscopes. The first commercially practical CRT was perfected on 29 January 1901 by Allen B DuMont.
A large glass envelope containing a negative electrode (the cathode) emits electrons (formerly called "cathode rays") when heated, as in a vacuum tube. The electrons are accelerated across a large voltage gradient toward the flat surface of the tube (the screen) which is covered with phosphor. When an electron strikes the phosphor, light is emitted. The electron beam is deflected by electromagnetic coils around the outside of the tube so that it scans across the screen, usually in horizontal stripes. This scan pattern is known as a raster. By controlling the current in the beam, the brightness at any particular point (roughly a "pixel") can be varied.
Different phosphors have different "persistence" - the length of time for which they glow after being struck by electrons. If the scanning is done fast enough, the eye sees a steady image, due to both the persistence of the phospor and of the eye itself. CRTs also differ in their dot pitch, which determines their spatial resolution, and in whether they use interlace or not.
(1994-11-17)
| Television and Video Glossary |
CRT (Cathode Ray Tube)
Electronic vacuum tube in which a thin beam of electrons is shot through the space inside and against the far wall (faceplate; screen) or a plate inside.. This includes all picture tubes used in TV sets or computer monitors.
Electronic vacuum tube in which a thin beam of electrons is shot through the space inside and against the far wall (faceplate; screen) or a plate inside.. This includes all picture tubes used in TV sets or computer monitors.
| Video Essentials Glossary of Terms |
CRT (Cathode Ray Tube)
A vacuum tube that produces light when energized by the electron beam generated inside the tube. A CRT has a heater element, cathode, and grids in the neck of the tube, making up the "gun". An electron beam is produced by the gun and is accelerated toward the front display surface of the tube. The display surface contains phosphors that light up when hit by the electron beam. The CRT is more commonly known as a picture tube.
A vacuum tube that produces light when energized by the electron beam generated inside the tube. A CRT has a heater element, cathode, and grids in the neck of the tube, making up the "gun". An electron beam is produced by the gun and is accelerated toward the front display surface of the tube. The display surface contains phosphors that light up when hit by the electron beam. The CRT is more commonly known as a picture tube.
Cathode ray tube Definition from Language, Idioms & Slang Dictionaries & Glossaries
| WordNet 2.0 |
cathode-ray tube
Noun
1. a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
(synonym) CRT
(hypernym) gas-discharge tube
(hyponym) Crookes tube
(part-holonym) oscilloscope, scope, cathode-ray oscilloscope, CRO
(part-meronym) electron gun
Noun
1. a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
(synonym) CRT
(hypernym) gas-discharge tube
(hyponym) Crookes tube
(part-holonym) oscilloscope, scope, cathode-ray oscilloscope, CRO
(part-meronym) electron gun
| hEnglish - advanced version |
cathode ray tube
cathode ray tube
(crt) an electrical device for displaying images by exciting phosphor dots with a scanned electron beam. crts are found in computer vdus and monitors , televisions and oscilloscopes. the first commercially practical crt was perfected on 29 january 1901 by allen b dumont.
cathode ray tube
(crt) an electrical device for displaying images by exciting phosphor dots with a scanned electron beam. crts are found in computer vdus and monitors , televisions and oscilloscopes. the first commercially practical crt was perfected on 29 january 1901 by allen b dumont.
Cathode ray tube Definition from Entertainment & Music Dictionaries & Glossaries
| English to Federation-Standard Golic Vulcan |
Cathode-ray tube
u'gal-zehl-mev
u'gal-zehl-mev
Cathode ray tube Definition from Science & Technology Dictionaries & Glossaries
| Abbreviation Airbus A340 |
CRT
Cathode Ray Tube
Cathode Ray Tube
Cathode ray tube Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Cathode ray tube
The cathode ray tube (CRT), invented by German physicist Karl Ferdinand Braun in 1879, is an evacuated glass envelope containing an electron gun (a source of electrons) and a fluorescent screen, usually with internal or external means to accelerate and deflect the electrons. When electrons strike the fluorescent screen, light is emitted.
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