If you are just looking for a large production display, running AdvancedHMI on a low end PC hooked up to a TV works well. I have even done it with a PC that only cost $100USD. Attached is a picture of one I did about 5 years ago.
A lesser known feature of the AdvancedHMI panel PCs is the HDMI output that lets you hook up to a TV to run a large production display on the TV and the normal HMI on the touch screen.