This is definitely the right forum, but I think you're out of luck.
There are only very few portable displays available, and most of them suck. In terms of portability, your best option are displays powered by DisplayLink (not to be confused with DisplayPort), which get their signal and power via a single USB3.0 cable. While it limits the number of thick cables you have to carry around and makes them very light and sleek (no AC/DC converter inside), there are only very few models with high resolutions available and you'll have to live with a 60Hz refresh rate. The display-size is quite low as well.
Currently, the only options you have are the Asus MB168B and the AOC E1659FWUX, both of which are 16" small 1920x1080@60Hz screens, allegedly with 11ms response time.
If you want a regular screen that is made for gaming and portability, the only options I am aware of are the GAEMS M-155 and M-240, which are only 60Hz, too. The M-155 is quite similar to the DisplayLink models mentioned above, it can even be powered via USB, which is nice, and has HDMI as a dedicated input method, but it's resolution is only 720p. The M-240 is a whole lot larger at 24" and I wouldn't really call it portable anymore, as it is way thicker and probably just as heavy as any other 24" screen. The only portability features are a protective cover and the stand which can be rotated to serve as a handle.
Personally, I'd like something like the M-155 at ~20" size with a more rigid and maybe heigh-adjustable stand design, but that's probably not going to happen.
Your best bet is to search through all screens of an appropriate size with features you're planning to get and search for those with a VESA mounting option, then get the thinnest one. That way you could build a stand yourself that is more slim than what the screen comes with. Alternatively, you could try to get a broken 18" laptop or something like that and build your screen from that.