I have 2017 MacBook Air and it shows display problem it did not fell but I dont know how this problem has come please help
Just to provide an answer...
The screen appears to have had an impact roughly where I've circled below. This could have been caused by a strike, but equally could be that something was on the keyboard when the lid was closed.
The initial impact has cracked the screen out in radial lines from the impact site, causing the circuitry in the screen to break along the lines - this is why there is no image above them; data cannot transmit across the broken circuit.