Why there’s a part of my screen notebook that goes dim?

I have a lenovo ideapad flex 4 - 1480

And yesterday my notebook work perfectly fine and the screen is also fine,but in the next day when i turn on my notebook there’s a part of screen that goes dim. It’s like the half of screen goes faint and the other half not it’s still same as usual. But i can use my notebook as usual there’s nothing wrong software.

Answer this question I have this problem too

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