why old TVs used to imprint the image of whatever show played on them on the screen permanently?

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why old TVs used to imprint the image of whatever show played on them on the screen permanently?

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Old TVs are made of a cathode Ray tube. The image was drawn by a beam of electrons striking a phosphorescent powder on the front of the screen.

If the same image was displayed too long, the electron beam could “burn” a pattern into that powder leaving a “burn in image”.