How do CRTs work?ĬRTs are sealed glass vacuum tubes that contain three main components: an electron source (often referred to as an electron gun), an electromagnetic deflection system (which directs the electron beam), and a phosphor screen that glows when 'he is hit by the electron beam. Later, computers also began to use CRT monitors as output devices, making them more interactive and eliminating the need for continuous printed paper output. Over time, other scientists discovered that CRTs could be used to display moving images without the need for mechanical moving parts, which was a key part of commercializing television. Braun diagram of his original cathode ray tube design from 1897. In 1897, a German engineer named Karl Ferdinand Braun added a phosphorescent screen and magnetic deflection control to create the first cathode ray tube, which he used to display the waveform of alternating current like an oscilloscope. Why "cathode rays"? Before the discovery of the electron, scientists called the flow of electrons "cathode rays", because these mysterious rays were for the first time emitted by a cathode (a negatively charged electrode), casting shadows inside. ![]() When someone says "a cathode ray tube" they can also refer to a television or monitor that uses a cathode ray tube instead of the cathode ray tube itself. ![]() ![]() CRTs are electronic image display devices that have the advantage of dynamically displaying information without the need for moving parts. It's a technical term for the glass picture tube inside a vintage TV or computer monitor - the type used before flat screens became mainstream. In the context of electronics, CRT stands for "cathode ray tube".
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