Sensitivity

A forced-restart may be beneficial:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On other iPad models: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

This aside, does your screen need cleaning? If so, gently wipe with a soft lint-free cloth (microfibre is ideal).

Are you using a screen protector? If so, you might try removing it.