Cathode-ray tube (CRT) | Britannica
https://www.britannica.com/technology/cathode-ray-tube
WEBCathode-ray tube (CRT), Vacuum tube that produces images when its phosphorescent surface is struck by electron beams. CRTs can be monochrome (using one electron gun) or colour (typically using three electron guns to produce red, green, and blue images that, when combined, render a multicolour.
DA: 54 PA: 69 MOZ Rank: 46