What
@albino71 says is correct. I've found this out the hard way sadly. I noticed my screen was very bright in darkness. It was so bright i would prefer to wear sunglasses, or just wouldn't use it in bed....
Luckily i have a collegue with the same mobile phone and i've compared mine with his.
Minimum brightness (left is mine):
As you can see, the difference is staggering. During daytime it's not a problem, but at night...
Maximum brightness (top is mine):
The difference is less noticable here, but there is some small difference in colour.
While further inspecting the phone, there was just 1 difference visible in the setting. Touchpanel firmware version. Mine was "Novatek-V07" and his was "07".
Mine:
His:
So apparently, they have different suppliers for some parts. That's nothing new for phone builders. Yet this time, they made a mistake.
I've sent my phone out for repairs. And after a mainboard-swap it was returned to me. My brightness issues are fixed now. My Touchpanel firmware version is now also "07".
Minimum brightness, left is mine, after repairs:
Maximum brightness, left is mine, after repairs:
Notice that also the colour difference is gone.
Buying this phone is a lottery now. Just hope you get a winning ticket