As we know, even if the screens is original screens, it still has kinds of quality level. Take iphone5/5S for example, there is at least 3 grade. Grade A. No bad pixel, no dust, perfect workmanship, appearance and display effect.( Highly Recommended ) Grade B. second only to Grade A, there are some flaws more or less. For example,1 or 2 tiny bad pixel, or there is a little dust in LCD and so on. But these do not affect use if customer have not strict standard. Grade C. More bad pixel and dust or other some flaws.
almost 4 years ago