Question What are those lines on my iPod's screen?

[ToxicCow19]

I found this old guy sitting in a drawer and decided to power it up, but then I noticed some weird lines on the display. I dont know what they are because they just show up when the backlight is on.

I took some pictures:

https://imgur.com/a/o045R8T

View: https://imgur.com/a/o045R8T

 

[Alabalcho]

Sitting on the drawer with something on top of it, or just getting very old, and some connections inside are already broken.