The Bosstouch PM156 is more than your average portable display. The 15.6-inch 1080p touchscreen includes three video outputs and operates at 85 Hz. The PM156 is available to pre-order on Seeed Studio for US$169 and will ship on May 27.
https://www.notebookcheck.net/Bosstouch-PM156-The-15-6-inch-IPS-1080p-portable-touchscreen-that-supports-Raspberry-Pi.420345.0.html
Don't you mean "inputs"? Why would an ordinary display have any outputs other than a 3.5mm headphone output?