Ipad pixel line
A line on my iPad air 4th gen appeared at the top of the screen. No other damage is present, and it hasnt been dropped recently
iPad Air (4th generation)
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As illustrated, your iPad has a screen or screen hardware fault that will require repair.
A reliable method to confirm a screen or other hardware fault is to take a screenshot when the fault is evident - and then review the captured screenshot image...
When reviewed, if the lines are not present in the screenshot image, then you have demonstrated that you have a hardware fault that, sooner or later, may become sufficiently severe that repair or replacement of the iPad are the only options. If the lines are visible in the screenshot, the something other than hardware will be the cause.
Note: When reviewing the image, rotating the iPad screen orientation by 90°, from Portrait to Landscape, will ensure that the image does not coincide with screen defects if present.
Take a screenshot on your iPad – Apple Support
Having confirmed that a fault exists, you would be best advised to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to test and assess your iPad - and allow you to explore your available options:
Genius Bar Reservation and Apple Support Options - Apple
Alternatively, you might consider use of Apple’s mail-in repair service: