Z10 screen cracked but bottom half works

I'm trying to work out what exactly I need to fix the z10. There is a crack roughly one third of the way from the top of the phone. Below this point everything works (I am typing this from the very same phone).

I thought that if the digitiser cracked the entire touch screen would stop working but this hasn't happened.

Can someone shed some light on the issue and tell me exactly what part needs to be replaced?

Posted via CB10

From readings here, you need to take the phone apart and find the exact part number for the screen. The ENTIRE screen assembly is ONE part with the front fused to the lower layers. There are some youtube videos on it. And one Ambassador just posted a thread on replacing the screen.