Cathode Ray Tube or CRT

It has an electron gun which shoots electrons toward the back side of the monitor screen which is coated with phosphors that glow when electrons strike them. The beam of electrons scans across the CRT monitor from left to right and top to bottom to create the image. Image quality on CRT is measured on dot pitch, resolution and color depth. They are cheaper as compared to LCD but generate more heat, consume more power and occupy more space.

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