Do you want to buy a new phone or smartphone? A manufacturer can't guarantee the absence of defective pixels on display. How to determine it? This article helps to make it easy.
Before you go to the store, prepare a few monocromic images of different colours. For example, blue, red, black, green, white.
This is due to the fact that dead pixels can be different colors, so you can experience a smartphone. Carefully look on the display. Then open next image, also carefully look on the display.
If you don't have images you can photograph monocromic objects, like a paper, furniture.
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