Amazon has got a deal for you in a 19″ TV loaded with 1 HDMI input.
Amazon product: SuperSonic 1080p LED Widescreen HDTV with HDMI Input and AC/DC Compatible for RVs, 19-Inch, Black, SC-1911
I picked this particular TV because it is 12 VDC capable plus it has an included DVD player. It is perfect to install in an RV. Picture quality is as expected. It is a nice unit overall. Of course, the sound quality is terrible but that is par for the course in these TVs. I added a Bluetooth transmitter and a quality Bluetooth speaker — sound problem solved.