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> because USB 3.0 is extremely difficult to make work from an EMI perspective running through a laptop’s hinges and lid Is that an issue with USB 3.0 causing i
by cpgxiii 2y ago
> because USB 3.0 is extremely difficult to make work from an EMI perspective running through a laptop’s hinges and lid
Is that an issue with USB 3.0 causing interference on the 2.4GHz band and thus interfering with Wifi/BT antennas mounted in the lid? It can't just be a signal frequency issue on the USB side, since eDP signals for the display itself are much higher bandwidth.
> MIPI is easier from an EMI perspective
In the "MIPI family" (e.g. FPD-link, GMSL) there are solutions for longer lengths via coax, but MIPI CSI itself seems pretty focused on short distance links (as expected, considering its phone industry roots). It seems like the distance from processor to hinge to top-of-screen could easily get close to the nominal maximum length of MIPI CSI. Or are laptops already using MIPI-over-coax to simplify the cabling through the hinge?
- heffer 2y agoAt least for the Lenovo ThinkPad X1 Carbon Gen10 I know that they use a hybrid FFP/micro coax design. FFP to fit behind the display panel as the cable runs up to the sensor assembly and micro coax for fitting through the hinge. I don't think you'll see a lot of purely coax based designs, given the trend to thin displays with small bezels. Other laptops like the Dell XPS 13 Plus run straight FFP from the mainboard all the way to the sensor.