You can get replacement IPS panels here:
I purchased extras for my clock and verified that they are the correct size and have the same pinouts as the original IPS panels. I tested one of the replacement panels in the clock and it works correctly. There is a connector on the back of the digit circuit board that when released the flexible circuit board of the display can be removed.
Hope this helps.
Many thanks for the great help.
I try to figure out the back connector mechanism how to release the but still unable get it. Any special tools required?