I can see where the RV market would use those 12V TV sets, but I'm not real sure
about saving a very high percentage over using 120vac.
Plus, some display technology uses voltages higher than 12vdc and the design would
need an inverter or buck booster to increase the voltage.
Look at laptop PCs, some run off 18vdc and use florescent tubes(HV) as a backlight.
I think other things could be done. This PC goes into power save mode,
when I leave it and not come back for a while. Using very little power.
Why not install a people sensor into TV sets? If you leave the room,
the picture starts dimming. If you don't move (IR sensor) or hit the
remote, it gets real dim and goes into standby, until it senses you're back.
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