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Would it be possible to turn a Pi + HDMI display into a USB monitor? The Pi with the monitor would act as a 2nd display.

(note that I'm not looking to avoid buying a USB monitor, I want to build an external gadget that incorporates a 2nd display)

  1. I see that the Pi can act as a USB OTG "gadget"/device: https://gist.github.com/gbaman/50b6cca61dd1c3f88f41 But I don't see monitor listed.

  2. I see that the PiKVM has chosen to incorporate hardware HDMI capture https://pikvm.org/ But this could be because USB monitors aren't supported at say, the bios screen, which is required for their use case.

Is it technically possible?

Do USB monitors require a special driver on Windows, or are they a standard USB class device?

What kind of code would have to be written on the Pi side to support this if it can't do it already?

Richard
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  • "I see that the Pi can act as a USB OTG "gadget"/device" -> That's a limited range of models and even with the Pi 4, limited to USB 2.0 speeds: https://raspberrypi.stackexchange.com/q/102294/5538 And while it may be possible in theory, I do not think there is software around to do it. – goldilocks Dec 09 '22 at 19:40
  • what do you want to use it for? – jsotola Dec 10 '22 at 00:17
  • I was thinking of building a personal videoconferencing device:
    • Connects to a PC with a single USB cable
    • Has a typical web cam ring light
    • Sits on a tripod that would be taller than a typical laptop screen
    • Has a web cam
    • Has a small screen, that to the PC looks like a 2nd screen

    This could be done with a phone, or separate components and a USB hub. But if a Pi could be turned into a USB monitor, it would bring few parts together.

     – Richard Dec 11 '22 at 00:44

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