Was an original display installed?

The display of my laptop was defective and I had it replaced in a workshop that was not owned by the manufacturer because it only cost 160. The manufacturer wanted to double what was not worth it. Now the question: was the original display installed how can I check it? I notice or imagine that it is darker so the display… Can also be because I'm outside at the moment and it seems to me that way. Well… Does someone give advice or does someone know where I can determine?

The graphics card (in the graphics card menu) usually shows the name of the monitor (manufacturer / type). Further technical data of the components, etc. You will possibly only get by "unscrewing". But if everything works it's fine.

It just says DDC display, I have no idea. He emphasized again and again that the original was used and if it was not an original it would not have displayed anything.

I just noticed that at the very top there's a very thin black bar so it seems to me that the windows are not filled in correctly as with the original display as he said.

Aha, the question would be what was there before, compared to now. But what the heck, don't worry, you also have a guarantee for repairs, etc. (in case something breaks again). After a repair, you won't get an absolutely new device in your hand. If things go so well, it's good. I don't think it's the original either, but you have no control, the repair company has done its job. The manufacturers are usually not interested in "repairs", so they often like to sell their original parts at "moon prices" (if at all…).