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Cathode-ray tube
01
a tube-shaped part in which electrons create bright images, and is used in old television or computer screens
What is a "cathode-ray tube"?
A cathode-ray tube (CRT) is a technology used in older television and computer monitors to display images. It works by sending an electron beam through a vacuum tube onto a phosphorescent screen. The screen is coated with tiny phosphor dots that glow when struck by the electron beam, creating images and text. CRTs were widely used for many decades, but they are now largely replaced by flat-panel technologies like LCD, LED, and OLED. While CRTs offered good color and contrast, they were bulky and heavy compared to modern screens.
Examples
The old television in the attic still uses a cathode-ray tube, so it's bulky and heavy.
The monitor at the computer lab was a cathode-ray tube, making it much thicker than today's models.
