katódsugárcsben

A katódsugárcső, often abbreviated as CRT from its English equivalent cathode ray tube, is a vacuum tube containing one or more electron guns and a fluorescent screen. It was historically a prevalent display technology in televisions and computer monitors. The electron guns generate a beam of electrons that are then directed towards the screen by magnetic or electrostatic deflection systems. As the electron beam strikes the fluorescent coating on the inside of the screen, it excites the phosphors, causing them to emit light and create an image. The intensity of the electron beam is modulated to control the brightness of individual pixels, while the deflection system moves the beam across the screen to draw the image line by line. This process is repeated many times per second to create the illusion of a moving picture. CRTs were known for their deep blacks and wide viewing angles, but they were also bulky, heavy, and consumed a considerable amount of power compared to modern display technologies. Their use has largely been supplanted by flat-panel displays such as LCD and OLED screens.