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LCD Burn In and Prevention


Screen burn in happens when a static image is displayed or one part of the screen rarely changes. In CRT displays this caused the phosphorus to be worn and the patterns to be burnt in to the display. But the term "burn in" is a bit misleading in LCD screen. There is no actual burning or heat involved.

LCD burn-in

We know LCD dot's ON or OFF is controlled by upper and lower electrodes. Which can aligns liquid crystal molecule in certain direction.

When showing a static pattern for a long time, the pattern area's liquid crystals will be forced to align up for a long period of time. Which makes them harder to twist to different directions in later time. And that causes the burn in effect, also called image persistence.

The prevention

  • Avoid displaying static picture for more than 20 minutes
  • Showing a moving screen saver or switch display content from time to time. When not in use, reduce back-light brightness(extend back-light lifespan)
  • Put LCD into "sleep mode", turn off back-light and switch LCD display content from time to time.
  • Shut off LCD screen totally.

If burn-in happened, we could try doing this to reverse it. Create an all white image and move it around the screen for couple hours. And you don't need to turn on back-light during this process.