My answer is too late, but I just had this problem last week.
Here is what I did and it worked as a charm. First I have Samsung Galaxy S7 that I love very much.
The upper 1/3 is lighted and lower 2/3 dark but responsive.
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Solution: Go to setting, Display, Always on and disable it. The clock will disappear when the phone goes to sleeps so does the problem.
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Solution: I did a hard reset through Safety Mode but that didn’t help. I went to setting, Display, Always on and disabled it. The clock will disappeared when the phone goes to sleeps so did the problem. I am not sure if factory reset is necessary or not but you can disable Always on first and see.
My answer is too late, but I just had this problem last week.
Here is what I did and it worked as a charm. First I have Samsung Galaxy S7 that I love very much.
The upper 1/3 is lighted and lower 2/3 dark but responsive.
Solution: Go to setting, Display, Always on and disable it. The clock will disappear when the phone goes to sleeps so does the problem.
Hope that will help.