You'd want to look at total efficiency. I expect new TVs like the 32-inch Samsung I bought last, which only uses about 30 watts, may still pull less power when inverter inefficiency is added. Direct current TVs I looked at a while back tended to be less efficient in general.
The interesting thing about this Samsung is that it uses a power plug similar to a phone or iPad charger. I don't recall the voltage but think the TV itself works on DC. I'll have to take a look at it again -- although I don't think it was 12-Volts even if DC.
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