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LCD, or Liquid Crystal Display, uses a powerful light passed through a transparent LCD chip containing video pixels. The video pixels are magnified through a lens and then projected onto a screen. LCD projectors offer solid contrast and brightness and are often easily portable, since the chip is relatively small compared to standard CRT tubes. LCD projectors are subject to pixel burn-out, which can leave annoying black or white dots on the screen, and cannot run for super-long times (8 to 10 hours) without risking overheating and pixel burn-out.