Originally Posted by Ron Jones
Actually there is a 50% loss of information as the JVC and Epson projectors display 4M unique pixels while full resolution 4K/UHD has 8 Mpixel. There is NO down conversion of a 4K/UHD image to 1080p with these pixel shifting projectors. Rather only half the pixels in the original 4K/UHD image are needed to create the pixel shifted image. The results fall somewhere in between the 2M pixel 1080p image and the full 8M pixel UHD image.
It is (potentially) more complicated than that. Since the two subframes overlap, they cannot display 8 million individually addressable pixels, nor can they display 4 million individually addressible pixels.
However since each subframe overlaps the other by 50%, they effectively multiply each other. The second subframe breaks each pixel into 4 parts, and those 4 parts, while not individually addressable, can have "unique" colors/values, so there are really 8 million "unique" pixels with an e-Shift system. The trick is, what do you put in those two subframes to generate the resulting image? If I were designing an e-Shift system, I would have software that would model/understand the interaction of those two subframes, would evaluate the source, and then would figure out what the two subframes would need to look like to best approximate the original source. For some content, you can get very, very close to 8Mpixel worth of information on screen, but of course there are limitations, like you can't generate single pixel scale, on-off patterns. Of course who knows what JVC actually does.
Calling e-Shift "4 Mpixel" is a convenient way to describe the difference between eShift and native 4K, but it is oversimplifying things.