As we go increasingly wireless, we become keenly aware of recharging batteries. Consequence is greater interest in "ambient power harvesting". A device powered by its own sensor's energy input is insightful. What next? keyboards powered by typing? trackpad/mouse by clicking & movement? Screens with an extra sub-pixel for light collection? Smart watch "self-winding"?
Depends on how you define the phrase "self-powered." Today, an "electric-powered" car may not necessarily mean to the exclusion of gasoline as an additional power source.
If a backlit device harvests the unused light from its own backlight, it would surely be powered by itself. Not _purely_, but it would be harvesting its own outputs for energy.
Fueling an electric car with gasoline has has nothing to do with self powered ambient harvesting machines. It looks like you're just trying to stretch concepts to suit your initial arguments.
LCD displays operate by partially blocking or completely blocking the backlight to produce an image. The blocked backlight photons are not used to generate the image. As opposed to a CRT or OLED display, which generate light to produce an image.
What original argument? This is my only comment on this thread. My point was that "X-powered" does not mean "powered-solely-by-X."
