![]() CRTs make up most of the weight of CRT TVs and computer monitors. The face is typically made of thick lead glass or special barium-strontium glass to be shatter-resistant and to block most X-ray emissions. As such, handling a CRT carries the risk of violent implosion that can hurl glass at great velocity. The interior is evacuated to 0.01 pascals (1 ×10 −7 atm) to 0.1 micropascals (1 ×10 −12 atm) or less, to facilitate the free flight of electrons from the gun(s) to the tube's face without scattering due to collisions with air molecules. The rear of a 14-inch color cathode-ray tube showing its deflection coils and electron guns Typical 1950s United States monochrome television set Snapshot of a CRT television showing the line of light being drawn from left to right in a raster pattern Animation of the image construction with interlacing method Color computer monitor electron gunĪ CRT is a glass envelope which is deep (i.e., long from front screen face to rear end), heavy, and fragile. Electrostatic deflection is commonly used in oscilloscopes. In modern CRT monitors and televisions the beams are bent by magnetic deflection, using a deflection yoke. In color devices, an image is produced by controlling the intensity of each of three electron beams, one for each additive primary color (red, green, and blue) with a video signal as a reference. In CRT television sets and computer monitors, the entire front area of the tube is scanned repeatedly and systematically in a fixed pattern called a raster. The term cathode ray was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons. CRTs have also been used as memory devices, in which case the screen is not intended to be visible to an observer. A CRT on a television set is commonly called a picture tube. The images may represent electrical waveforms ( oscilloscope), pictures ( television set, computer monitor), radar targets, or other phenomena. If you or someone you know still has an old CRT TV in their home and are thinking of getting rid of it, be sure to find a certified data destruction and recycling company who will be able to recycle your old CRT TV safely.The only visible differences are the single electron gun, the uniform white phosphor coating, and the lack of a shadow mask.Ī cathode-ray tube ( CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. Given the high density of toxins that are housed in CRT TVs, it’s crucial that these devices are recycled and not thrown away in a landfill. In addition to lead, there are often traces of mercury within the tubes as well. CRT TVs typically include about 4 to 8 pounds of lead in the glass tube, and the inside of these tubes also are coated with toxic phosphor dust. What some people might not realize is that these tubes contain high levels of toxins. These tubes contain one or more electron guns and fluorescent screens that are used to view images. Does it have a low back on it? Would it be nearly impossible to hang on the wall? If you answered yes to all these questions, you probably have a CRT TV and not a newer flat panel TV that has been growing in popularity ever since the turn of the millennium.Ī CRT TV is a television device that uses cathode ray tubes. If you knock on the front of the TV, is it thick glass? That is, it doesn’t push in a little as a flat screen plasma would. ![]() There are three clues that you might have a CRT TV. Your next question might be, what is a CRT TV? Read on to learn more. ![]() Something that you might still have lingering in your home is an old CRT TV. Whatever your e-waste is, it’s essential that they do not end up in landfills and instead, are recycled by a certified data destruction company. When it comes to recycling old electronics, the things you might often think of our old desktop computers, printers, and fax machines.
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