cathode ray tube

What is cathode ray tube?
A cathode ray tube is a display device used in televisions and computer monitors. It's a type of vacuum tube that contains one or more electron guns, electrostatic baffles, and a phosphor target that is on the back of the glass screen. One cathode, for which the CRT got its name, is a positive terminal that allows electrons to enter.

In a computer monitor or television set, the entire face of the tube is scanned systematically and rapidly in a fixed pattern called a grid. Images and colors are created by capturing and controlling the electron beams representing each additive color light (red, blue and green) using the video signal as a reference.

Modern CRT monitors use magnetic deflection to bend the electron beams. This is done by varying the magnetic field generated by coils that are driven by electronic circuits that are arranged along the pipe neck.

A cathode ray tube is a special vacuum tube in which images can be created by beaming electrons onto the phosphorescent surface. The CRT, also known as the picture tube, was the only choice for a display device until the less bulky and less power hungry LCD was invented. They usually use magnetic deflection to change the orientation of the electron beams, but other types use electrostatic deflection.

Diese werden üblicherweise in Oszilloskopen als magnetische Ablenkung verwendet, die die induktive Reactance der Magnetspulen verringern und den Frequenzgang des Oszilloskops begrenzen würden.

The brightness, color and durability of the lighting can be varied by using different types of phosphors. This is particularly useful for making CRTs for various applications.