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Messages - FJAcontrolesSA

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TFTs / EMI/EMC design tips for NHD-4.3-480272EF-ATXL#
« on: December 09, 2016, 02:40:01 PM »
Hello everyone,

We use the NHD-4.3-480272EF-ATXL# TFT display in the front console of one of our product designs (a 19'' rack mounted industrial control unit). We resently did some pre-compliance testing for EMC and during the emission test we had a big chunk of interference around 200MHz which seemed to be related to the display (i.e. turning it off made the interference go away).

We did not put much care to the EMI desing of the front consola assembly (and it shows!), so now we a reviewing the design with this in mind and I had a couple of questions:

1) Should the TFT bezel be grounded?
2) We are making sure that all TFT signals are now running over a solid ground plane for both signal integrity and reduced emissions. What should the trace impedance be? Is 50ohm OK?

Any other tips will be much appreciated!

Thank you all in advance.

Cheers

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