Black line on laptop screen?

Hello!
About 3 weeks ago a small black line appeared for the first time on the top right of my screen. This was about 1 cm long.
Now it's bigger and a bit greenish (approx. 3 cm).
Even when I restart the pc, the line does not go away. What's this?

Lcd damage

Probably damage to the device.

Your display is broken.

Display damaged.