I basically know how TFT' displays work. They have on both sides a polarizing foil, in 90 degrees with the crystals in the middle modifying which light particles should pass through or not. The light is emitted by a backlight in the display. So far so good.
What I try to find out or understand is, whether it would be possible somehow - by modification of the TFT / the 2 polarising foils / or by adding a new polarizing foil / or by any other means or filters that the backlight can be removed and replaced by a mirror.
Basically what I am trying to find out if its possible to build - in theory - a TFT display that is not backlight but gets the light from the front (from the direction where the viewer is).
As I see, polarized light that gets into the TFT display from the front should be able to be reflected at the back from a mirror no? Normally the polarized light is reflected by the mirror and passes back the same way throught the TFT it came from.
Or am I wrong? Any help appreciated to untie the knot in my head :)