Here in the US many small flat screen
TVs are available for under $200. Most of these actually run on 19V DC or so. (It is marked on the back) If it has a wall "brick" that you plug
in, and it converts the 120V AC to 19V (or whatever) DC, that's all you need to know.
Then you look on their accessories list first. Next... a laptop
computer supply company's catalog/web site for the appropriate "car adapter". The V "in" will be 12V DC with a cigarette lighter plug, then it goes to a small V converter box, and the "wire out" plugs into the TV @ it's correct V. (ofter 19V DC)
There are hundreds of these converter/car adapters available, and you should be able to match the V out and A needed, as well as appropriate power out plug. It will work the same as with the wall brick that came with it.
The above method of powering your TV is TWICE as energy efficient as using an inverter
to power the wall brick that came with the TV, IF using the car adapter allows you to keep those power hog inverters turned OFF. They are best reserved for VERY occasional use.
Our digital TV works great with a mast
mounted "boosted" UFO antennae, but we have to do a new scan when anchored in a new place.
BTW... While most programing is crap, there are great science and history
related programs available on PBS, (NOVA), and you can take a collection of your own DVD movies of choice.