1 and two are half a screen (one field), 3 and 4 are the other half. You should have continuity on all of them except maybe two pins.
Should be 1-1 to 2-1, 1-2 to 2-2, 1-3 to 2-3, then at some point you'll have something like 1-4 goes to some part of the board, 1-5 goes to 2-4, 2-5 goes nowhere, then 1-6 goes to 2-6, etc.
This is just an example, it changes with each type of panel and I don't have either of my PB100s with me to check at the moment.
Whatever you see between drivers 1 and 2 should be the same between 3 and 4.