kuvaputkinäytöt

Kuvaputkinäytöt, often referred to as CRTs (Cathode Ray Tubes), were the dominant display technology for televisions and computer monitors for much of the 20th century. They function by firing a beam of electrons from a cathode at the back of a vacuum tube towards a phosphorescent screen at the front. Magnets or electrostatic plates are used to steer this electron beam. As the beam strikes the screen, it excites the phosphor dots, causing them to emit light and create the image. The intensity and position of the electron beam are precisely controlled to draw each line of the image, rapidly scanning across the screen multiple times per second to create the illusion of a continuous picture.

The image quality of CRT displays was characterized by their excellent black levels and wide viewing angles. However, they were also bulky and heavy due to the nature of the vacuum tube and associated electronics. They suffered from issues like screen burn-in, where static images left on the screen for extended periods could permanently damage the phosphors. Furthermore, CRT technology was not as energy-efficient as newer display technologies. Despite their eventual obsolescence in the consumer market, replaced by flat-panel displays like LCD and OLED, CRTs played a crucial role in the development and widespread adoption of visual electronic media. They remain relevant in some niche applications, such as in certain scientific instruments and broadcast equipment, where their specific characteristics are still valued.