Ingress EMI on a TFT display
We are using an NHD-1.8-128160EF-SSXN-FT display in a design which also contains an RFM95 LoRa transceiver with the LoRa 868 MHz antenna about 2-3 inch away from the display. We find that whenever the LoRa module transmits, the display jumps all white and sort of locks up; it still responds to commands but needs to be re-initialised in order to use it again normally.
We suspect the flexcable wires acting as sort of antenna's for the RF-signal and the interference ending up on the SPI-port.
Are there some kind of best practices on how to make the display more robust to RF interference?
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Hi Rene,
Thank you for your patience. You can try the following different scenarios to reduce RF interference.
Firstly, you can wrap the FPC with copper tape, and then tie a short wire from the copper tape to a good ground. If the design consists of components like a bezel, mounting bracket, EMI mesh, ITO shield, etc. then ensure these components are connected via a short path to the ground.
Secondly, minimize the current draw of the device. Whenever possible, use the highest available voltage that is acceptable for the device to reduce the drive current.
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