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cathode-ray tube (CRT)


cathode-ray tube (CRT)

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In a colour-television tube, three electron guns (one each for red, green, and blue) fire electrons …—Encyclopædia Britannica, Inc.

Vacuum tube that produces images when its phosphorescent surface is struck by electron beams. CRTs can be monochrome (using one electron gun) or colour (typically using three electron guns to produce red, green, and blue images that, when combined, render a multicolour image). They come in a variety of display modes, including CGA (Color Graphics Adapter), VGA (Video Graphics Array), XGA (Extended Graphics Array), and the high-definition SVGA (Super Video Graphics Array).

This entry comes from Encyclopædia Britannica Concise.
For the full entry on cathode-ray tube (CRT), visit Britannica.com.

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