I'm building a small laptop-ish device in a briefcase. Imagine the green wires aren't there. The LCD half lies somewhat deeper in its case than the keyboard part.
For now, testing and programming, I'm using four wires (2x I2C, ground, 5V) to connect the both parts. However, that isn't that neat. When closing the case for example, you should look after the wires in order for them to stay in the case. First solution of course is shorter wires, but that wouldn't be that neat either.
So what I'm looking for is a neat way to do the inter-board communication. It should be easy to handle and robust.
The normal way to do this in a laptop is to wire it through the hinges. This isn't a possibility with this case, unfortunately.
Answer
The obvious and silly approach is to put a battery in each half of the design and communicate wirelessly...
This is called a "clamshell enclosure" and there are two basic practices for routing wiring through the hinge. The first, you alluded to, use cabling bundled into a minimum cross-section (round bundle) and route through the actual hinging mechanics. The other is to use Flexible Flat Cable (FFC/FPC).
Numerous mass produced cable systems for this exist (due to cell phones, monitors, laptops, etc). For starters, you could check out the Hirose FP19 series.
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