Is this screen saveable? Samsung S6 black screen with purple blotches

I have been using my Samsung S6 as a security camera using Alfred. It was positioned in my window sill looking out over my front yard, screen off, but exposed to morning sunlight. It was also connected to a Samsung fast charger. Today, when I disconnected it to check a notification I heard, the screen is completely black, except for some purple and white blotches at the edges.

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I did not drop the phone, nor was it bumped, impacted or crushed. I have tried force rebooting, draining battery until empty, then recharging, removing screenprotector and casing. Removed any lint from charing ports. No SIM is inserted.

My questions are:

  1. Is this screen broken beyond repair?
  2. If no, how do I fix this?
  3. How was this caused? Sunlight? Fast charger? Something else?