Black display. And I use USB c to HDMI tv

Hey.

how go i get back to the picture 1. i have try differenst erase things with a pitch black screen. But as you see in the first Picture i could se the write system. But now in the picture 2 as you se its only a lock? How do i do so i can go back to the unlocked picture as i had first? How to i erase so i can see the phone on the tv?

1 picutre here.

And now i only see this? i had it so beefore to then i did come back like in the picture one. But then i did something again. haha.. im a njuube about samsung. haha ...

here picture 2: