This is part of an iPhone 7 schematic. The VDD line is the main voltage rail for the phone.
I noticed this AC coupling tied to the LCM (display ground) I'm not familiar with MIPI but assume it has to do with connecting an external monitor to view display on the iPhone.
My understanding is that AC coupling caps is to allow ac to pass but block DC so, how would there be any AC on the main VDD line for implanting AC coupling caps? And what's the purpose?