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It would cost more money to replace the touch screen than to just buy a new tablet pc. It cannot be repaired without putting in a brand new touch screen.
First try and hold the power button down until it switches off and then turn it back on and see if you can unlock it.
If you can't unlock it then you can do a recovery this is how
when it is switched off hold the volume up and the hold the power button until you see a recovery screen with options there you will see a option to recover.
Had the same issue with the touch screen of HP, so I disabled it using device manager. Mine is 4th item in "Human Interface Devices". See the image below.
Whoever used the term "calibrating an iPad" may have been referring to touch screen calibration.
Some touch screens need to be adjusted, or "calibrated", or the device may act as if you touched a different spot on the screen than you did. The iPad screen does not need to be calibrated. If the iPad make a mistake about what spot you touched, the error may be due to:
a defect or damage;
a screen protector;
a cold finger;
a hand that is holding the iPad and inadvertently touching the screen;
a finger that is inadvertently touching the screen.
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