#Cathode ray tube television radiation free

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.

#Cathode ray tube television radiation free

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 an LG.Philips Displays 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 only visible differences are the single electron gun, the uniform white phosphor coating, and the lack of a shadow mask.

Health concerns Ionizing radiation Toxicity Flicker High-frequency audible noise Implosion Implosion protection Electric shock.

Types Monochrome CRTs Color CRTs Shadow mask Screen manufacture Convergence and purity in color CRTs Magnetic shielding and degaussing Resolution Projection CRTs Beam-index tube Flat CRTs Radar CRTs Oscilloscope CRTs Microchannel plate Graticules Image storage tubes Vector monitors Data storage tubes Cat's eye Charactrons Nimo Flood-beam CRT Print-head CRT Zeus – thin CRT display Slimmer CRT.

Construction Body Size and weight Anode Electron gun Construction and method of operation Gamma Deflection Magnetic deflection Electrostatic deflection Burn-in Evacuation Rebuilding Reactivation Phosphors Phosphor persistence Limitations and workarounds Blooming Doming High voltage Size Limits imposed by deflection.

History Discoveries Development Decline.