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Stuck Pixels !
I never knew about stuck pixels .
Stuck pixels are similar to (and often falsely labeled as) a dead pixel, whose 3 sub-pixels are permanently off, producing a permanently black pixel. Dead pixels can result from similar manufacturing anomalies as stuck pixels, but may also occur from a non-functioning transistor resulting in complete lack of power to the pixel. Dead pixels are much less likely to correct themselves over time or repaired through any of several popular methods.
Read the wikipedia Guide for more details .
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