Since I can some what decipher your engrish so I will try and answer your question.
Install a power relay behind your screen using the IGN or ACC wire to turn it on. Run a 12V wire from your battery through the switched part of the relay. Use the output power of the relay to power your screen/head unit. Run that same power to the trunk to your "white" wire on the M2 PSU. Be sure and put a diode in reverse bias in line before the carputer so it will shutdown properly.