I need to use a TFT module with an integrated capacitive touch. The TFT has it's FFC and the touch controller has its own, with power supply and an I2C interface. Quite standard, I think, since every panel I've seen does it that way.
However I have some doubt about the working ''environment'' of the capacitive touch. The front panel is made of 1.5mm steel and it's grounded. So there will be a cutout for the panel.
My fear is that the steel would somewhat interfere with the projected capacitive fields. I had issues with other capacitive sensors (like single pad touchs) but the technology is slightly different. In short the steel is like a really big finger and even with auto calibration it messed up (also every kind of noise probably converge on that)
Should I make the cut out way bigger than the panel? Assembly tolerance is 0.5mm so 0.5mm extra space on each side should suffice mechanically but I had to do even 5mm of clearance in the past (with the pad touchs).
5mm on each side would be a lot difficult to conceal (unless we find/make a plastic bezel, which seems the most common option).
Do you have some experience or resource on that? the chinglish controller datasheet, as usual, gives no tip about that.