How Everything Works
How Everything Works How Everything Works
 

QUESTIONS AND ANSWERS
 
Question 296

How can computer monitors and televisions have images burnt into them over time?
As the electron beam collides with the phosphor coating on the inside of the picture tube, it slowly damages that phosphor coating. Eventually the phosphors are burnt away and the inside surface of the picture tube stops being uniform. To avoid burning specific regions more than others, computers use screen savers that darken the images by turning down the electron beam and keep those images moving about randomly.
         

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