Using the iPad on zoom meeting, suddenly the screen turned white. I performed restart but did not fix it. If it Is left on and not locked , the white fog shaped as a rectangle with round edges in the center, gets smaller but there is still a faint haze. The iPad was dropped more than 3 weeks ago but did not show any problem only until this time. Is the hazy screen due to the drop, or something else? I tried tapping the back under the camera, but still not fixed. It is usable but whenever the screen is turned off, upon restart the screen is all covered with the white haze. Please help.