Many small TV's now come with a removable plug in adapter that converts 110 power to the 12 volt power in the TV.
We have a 22 inch unit that is just that, and it cost us about $150. One of it's features is the ability to change the screen depending on the angle of viewing, and it does not require tilting the TV, but just inputting the angle of view to the unit. That makes a huge difference for us.
It will run peacefully off 110 at about 25 watts, or can be plugged into the 12 volt power directly if need be.