The big laptop manufacturers each have one or two mobile displays these days, e.g. stuff like the Thinkvision M14, which is basically just the display portion of a 14" thinkpad. These are USB-C only though, so compatibility is rather limited and getting these to work on something without USB-C requires about 100 € in adapters (Wacom Link - 75 €, USB-C PSU - 25-30 €).