I was missing the cable between Pin 3 and Pin19 to adjust the fontsize.
Then I had to solder a voltage devider in between of the line to pin 4.
I used 4.7k resistors:
line 4 from K5 ---- (4.7k) -----*--------to pin 4 of display.
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(4.7k)
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GND Pin2 of display
Unfortunately, my inverter seems to be dead. It only provides 3V if a display is attached.
So I have to replace the N103-05-5 Nichia.
Do I get it right, that it uses 5V , as it is attached to the output of the 7805 ?
( Most inverters seem to use 12V.)