[pdurrant]

I suppose it all depends on exactly how reflective various layers are, and how the diffraction gratins/lenses work.

I can certainly imagine that in bright light /some/ of the light might reflect from the very back of the display, and so give some very faded colour in what would otherwise be a pure B&W mode.

Originally Posted by soilwork

Thanks for your detailed explanation. However, from the video clips, they demonstrated color screen without backlight. I wonder whether this will contradict your explanation.