Screen display has gone mad with its colors...what can I do to fix this

I have plenty of ideas but I dont know if any of them are any good. Try closing all apps in the recents tray and restart the iPad.

Go to the home screen first by tapping the home button. Double tap the home button and the recents tray will appear with all of your recent apps displayed at the bottom. Tap and hold down on any app icon until it begins to wiggle. Tap the minus ➖ sign in the upper left corner of the app that you want to close. Tap the home button or anywhere above the task bar.

Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.

And I do have to ask.... you didn't drop your iPad or have any other kind of accident with it did you?

Settings>General>Accessibility>Invert Color>Off. check that. If thats not the problem, reboot your iPad.

Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.