Question Vertical shadowy lines on monitor

[WitheredRose]

There are some vertical shadowy white lines visible on major portion of the screen, anybody knows what that can be? They are visible on any color. It's clean so it's not any dirt smudges.
I noticed it earlier that year, had it for at least 12 years, probably more, using it as my second monitor now. It's LED SAMSUNG S24C300H

 

[Lutfij]

Looks like the panel is on it's way out...though it's commendable that it lasted 12years(or more).

 

[WitheredRose]

Looks like the panel is on it's way out...though it's commendable that it lasted 12years(or more).

Yeah, that's also what I thought, tho the pattern is weird, also no stripes on far left.

Turns out I was wrong by one year, I had it for 11 years. Glad that it lasted that long, hope it will still go for a while longer.