Eye strain seems like the wrong thing to focus on here. I'm much more interested in the efficiency of this design. Most of the energy drawn by an LCD goes into

Eye strain seems like the wrong thing to focus on here. I'm much more interested in the efficiency of this design. Most of the energy drawn by an LCD goes into its backlight. If you are trying to use one outside, then you are fighting the brightness of the sun by matching its intensity with a backlight. Why not just use the sun as a backlight instead? Of course, this is a very simple and clunky version of that. I do wonder how much could be optimized.