Fosforinäytön

Fosforinäytön, meaning "phosphor screen" in Finnish, refers to a display technology that was historically significant. These screens utilized a layer of phosphor material that would glow when struck by an electron beam. This principle was the basis for cathode-ray tube (CRT) displays, which were the dominant display technology for televisions and computer monitors for many decades.

The phosphor coating on the inside of the CRT screen is made up of tiny dots or stripes of phosphors. Different types of phosphors emit different colors when energized by electrons. In color CRTs, three primary colors – red, green, and blue – were used, and by varying the intensity of electron beams directed at these phosphors, a wide spectrum of colors could be produced. The electron beam was scanned across the screen line by line, creating the image.

While largely replaced by newer technologies like LCD and OLED, phosphor screens played a crucial role in the development of visual display technology. Their widespread adoption made information and entertainment more accessible through television and computers. The characteristic glow and sometimes slight persistence of the image were hallmarks of this era of display technology. The term "fosforinäytön" thus evokes a specific period in the history of electronic displays.