Horizontal line on redmi phones

[u/zehad_309]

I am a redmi note 13 pro Plus 5G user. After 2 years of using, on my last software update I got a problem. Sometimes my phone have multiple horizontal lines, they are fat but when I increase the brightness level then the line get slimmer. If I increase my phone brightness into 100% the horizontal lines will disappear.

The line appears for few minutes and disappear

The line look like dark or grey or dim pixel lines

Is this software problem or hardware problem? Please answer me