Hi. Do you know what might have caused the LCD issue? Do you think over charging or using 3rd party charger might be the cause?
Doubt it has anything to do with charging. Only two plausible reasons, you might have exerted extreme force on the screen without realising it.
Second is that it just happened to be a defective LCD due to poor quality, managed to pass QC but cannot survive long term use. Unfortunate for you is that you aren't able to utilize the 1 year Xiaomi China warranty unless you happen to be in China.
Think there is a few users on the MIUI forum who got this issue too.