katodisädeputkinäytöt

Katodisädeputkinäytöt, often abbreviated as CRT (Cathode Ray Tube), were a ubiquitous display technology used for televisions and computer monitors for many decades. The fundamental principle of a CRT display involves an electron gun that emits a beam of electrons. This beam is then accelerated towards the screen by high voltages. The inside surface of the screen is coated with phosphors, which glow when struck by the electron beam. By rapidly scanning the electron beam across the screen horizontally and vertically, and by varying the intensity of the beam, a complete image is formed. Color CRTs employ three electron guns, one for each primary color (red, green, and blue), and a shadow mask or aperture grille to ensure the electron beams strike the correct colored phosphors. The deflection of the electron beam is typically achieved using magnetic fields generated by deflection coils. While CRTs offered good contrast and color reproduction for their time, they were bulky, heavy, and consumed significant power. They have largely been replaced by newer flat-panel display technologies such as LCD, LED, and OLED.