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I know you probably have nothing besides the display in the card to keep it small, but that probably increases the number of Pogo pins you need if you need to run the entire display protocol over Pogo. If you had a demultiplexer in the card you could use only 3 Pogo pins.

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I wish it were pogo pins, but they're so expensive. I'm using spring fingers and they're surprisingly reliably and durable (so far).

I'll look into using a demultiplexer, because maybe then I could afford the pogo pins.

Look into Dallas Semiconductor 1-Wire. Could do it with 2 pogos.

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