Best way to display something to an attached screen?

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jms
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Best way to display something to an attached screen?

I would like to modify the code on a router (any model) to output messages to a screen, what would be the easiest way to do that? I've considered trying to find a displayport driver that works in linux so I can use a USB port, I'd prefer something more like a usb-serial adapter to drive an lcd panel. Does anyone have experience with this?