Screen backlight has uneven brightness

I just received uConsole today. It was working well, and I left it on for couple of hours to charge my batteries.

Then I noticed that the screen borders are kinda dark.
First, I thought I tightened front panel too much. So I removed the front panel.

(front panel is removed to make sure this is not caused by pressure)

It looks like the backlight has uneven brightness on the border of the screen.

If anyone has same experience or some solutions. Please let me know.

This is solved.
I left it off 10-20 min. then the backlight went back to normal.
I guess it is caused by the heat from CPU.

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it might be moisture. maybe leave it heated for long enough and it’ll disappear on its own…