Is it possible to track pixels lighting on and off on a board to serve as a language tablet for communication?

yes.

but it’s inefficient.

you could just display barcodes or QR codes on regular panels, use a camera to read those.

or you could use IRDA communication, or radio communication like wifi, bluetooth, something custom based on nRF, or ESP-NOW… which you should take a look at. the Espressif ecosystem makes a lot of sense for IOT and “hobby” robotics.

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