Is there a little black line on my laptop?

Since yesterday I have a black line on my laptop which is suddenly slightly red and black. Does anyone know how I can solve this problem?

LG

As much as you hate to hear the answer: not at all. Your laptop has a damaged display. Secure your data or what is important to you and deal with the thought that you will need a replacement. And no, it's definitely not worth repairing unless you have a $ 3,000 laptop.

This is damage to the display that can hardly be repaired other than using a new display.

Depending on the price range of the device, it is questionable whether a repair is worthwhile or whether you should not buy a new one right away.