[Fatnino]

I recently picked up a $100 external display on amazon. It's essentially a laptop screen with a magnetic cover a la surface tablet.

It's just a screen, no touch capabilities or any real processing onboard.

This screen has 3 usbc ports and a mini hdmi port. It also has an audio out jack.

In theory, it can be driven with a usbc to usbc cable from a phone or computer, but I don't have a device that can drive it this way.

The second usbc port is auxiliary power for when your phone can't power the whole screen.

The third usbc port is for daisy chaining another device.

The way I use this thing is from my (fairly old) laptop that only has display port out. I have an adapter that changes the DP port on my laptop to full side hdmi and then use the hdmi to hdmi mini cable that came with the screen.

Unfortunately, this setup does not pass sound to the audio jack. I wish my laptop had an hdmi port instead.

[seba_dos1]

I have a similar portable screen with almost the same set connectors (only two USB-C ports and miniHDMI, no daisy chaining). That "(fairly old)" is the key there, as pretty much all modern laptops support DisplayPort over USB-C. I can plug that screen to my 4 year old laptop or my phone using USB-C to USB-C cable and it works, including audio.