The cause of the flickering are these wires, which are bonded to the small PCB. The PCB takes the LVDS-Signals and de-multiplexes them into the 1900x1000 (or so) lines which drives the display. There are three of these connections below the Do not Touch-Area. One seems to be defect, so one third of the display is broken.

My Display is marked with 720557-001. This corresponds to the No Touch, Full HD Spare Part number in the Manual I have linked on the front page of this guide. I ordered mine from an ebay-dealer in the UK for 85€ incl. shipping. The name of the company is REQUIRE-IT and the delivered fast and the display is working.