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Originally Posted by Papi
Very interresting, thanks to both of you. Only thing that is still unclear to me is : how does a Pixel QI screen "physically" displays black & white ? because on the picture it seems each pixel is red / green / blue, I guess the "white" part of the B&W mode is just the background of the screen, but what about the "black" ? Though I don't know how they render it in regular LCD also, i guess the pixels have to "block" the backgound light.
Sorry for all the questions, i feel a bit like poluting the thread...
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In the case of OLPC at least (I can't remember if current Pixel Qi is the same), the reflective layer is between the LCD and the color filters. The color filters are between the reflective layer and the backlight.
So basically, the backlight goes through the color filters, through the semi-permeable reflective layer, through the LCD (which is monochrome of course). Outside light bounces off the reflective layer and never reaches the color filters. Color filters reduce light transmission significantly, so it makes sense to put the reflective surface in front of them.
There are lots of other things going on in a display, and lots of other layers, but hopefully that helps address your question of monochrome versus color. To restate, the reflected light doesn't reach the color filters, which are behind the reflective layer.
It's late though, and if I'm mistaken, someone please correct me.
