Glance screen is a software package that displays info when your phone is locked and "Off." Are you saying the information displayed is garbled?
Or do you mean the physical screen hardware components are separating?
In case of the Glance info... Do a Soft Reset, hold the Volume Down + Power buttons until the phone reboots and vibrates. It will clear "gunk" out of system memory. If that fails, reset your phone with the first tool on this page: FAQ - How can I recover/reset/restore my phone software? - Microsoft - USA
In case of the physical components separating: seek warranty repair or replacement.
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