If you look through the service manuals then you'll discover that B&O makes the panels are recognized by the system.
In the early type D5 - D8 the software settings can be made by hand with the help of an original remote of panasonic.
The software of a D9 or higher panels are programmed with flashprogram on a pc.
Even if you expending your D7 panel with a DVI module then there is also a flashprogram needed to re-program the panel.
The panel has to be recognized by the system because there is an active 2-way communication between the panel and the system.
This has to do with the contrast and luminance settings and the geometric settings as mentioned.
With a new pana panel without the right software it might not work.