You make a good point. There are lots of TVs that can be powered from a 12-volt source, but finding a TV that can be powered from a USB port (5 volts) may be hard. A quick search this morning didn't turn up any. Beyond that, a small TV may use about 35-40 watts of power. This is about 3 amps of current from a 12-volt source, which is easy. But it is about 7-8 amps from a 5-volt source, and not many USB chargers that can supply that much current. I've found a couple, but of course they plug into an ordinary house power wall plug - 120 VAC - and if you have house power available, you would just run your TV from that.
So finding a USB-powered TV will be difficult on both the voltage and the current requirement. If anyone finds one, let us know.
Bill
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