Here's an idea ala citing the power-consumption issue... If the developers are smart and actually think about applicable usage and longevity of the device, they would have the lighting portion of the device drawing power from an secondary source aside from the source driving the device. The benefits here would be that the device could continue operation for a much longer period after the lighting portion drains the battery (which would probably happen pretty darn quickly if used for extended periods even using LED's). They could even go further by making the display's battery user-replaceable, even if it is some proprietary battery, that way they can carry a spare.
Just my two cents!
