Katodestrålerøret

Katodestrålerøret, often abbreviated as KTR, is a vacuum tube used to display visual information. It consists of a cathode that emits electrons, which are then accelerated and focused by an electron gun. These electrons are directed towards a phosphorescent screen at the front of the tube. When the electrons strike the screen, they cause the phosphor to emit light, creating an image. The electron beam is scanned across the screen rapidly by deflection coils, either magnetically or electrostatically controlled, to create a full picture. This scanning process is known as raster scanning.

KTRs were the standard display technology for televisions and computer monitors for many decades. The technology allowed for the creation of relatively large and inexpensive displays, making them widely accessible. Different types of KTRs exist, including monochrome (black and white) and color versions. Color KTRs use multiple electron guns and a shadow mask or aperture grille to ensure that electrons hit the correct color phosphors (red, green, and blue) on the screen.

Despite their historical significance, KTRs have largely been replaced by newer display technologies such as LCD (Liquid Crystal Display) and OLED (Organic Light-Emitting Diode) screens. These newer technologies offer advantages such as thinner profiles, lower power consumption, and higher resolutions, making KTRs obsolete for most modern applications. However, KTRs are still found in some specialized scientific and industrial equipment.