It all depends on how the dots are arranged.
It the dots are all separate, then you need to use RGB, as the light reflecting from them adds.
If the dots overlap (as in printing), then you need to use CMY, as they combine to remove light reflected from each (overlapped) dot.
Cyan absorbs Red light, reflecting Green and Blue light
Magenta absorbs Green light, reflecting Red and Blue light
Yellow absorbs Blue light, reflects Red and Green light
So you can show a Red dot either by using a Red dot (which absorbs Blue and Green light, reflecting Red light), or by using a Magenta dot overprinted on a Yellow dot (The Magenta Dot absorbs the Green light, and the Yellow dot absorbs the Blue light, leaving only the Red light reflected.)
So, if a colour display is made with separate side-by-side dots, it must use Red, Green and Blue pigments.
If a colour display has (say) a structure perpendicular to the page that consists of three pixels one on top of each other, it must use Cyan, Magenta, Yellow pigments.
I think that an ebook display using the latter (CMY & perhaps black), would lead to a brighter, higher-resolution display.
And I suspect that it might be easier to make in the long run - each pigment would cover a whole layer of the display, while for the other display the pigments need to be right next to each other in the same layer.
Quote:
Originally Posted by kacir
I do not understand.
With monitors you ADD green, blue, red LIGHT to achieve colors. Funny thing is, that 100% red + 100% blue + 100% green do not give you white light. It is just our eye that perceives it as white light.
see http://en.wikipedia.org/wiki/RGB
When printing on papers, instead of adding light, you SUBTRACT. That is why a color printer uses Cyan, Magenta and Yellow ink to mix ink dots on paper and achieve colors. Most often CMYK is used, adding blacK, so you so not use 100%C + 100%M + 100%Y, but instead you only use 100%K.
see http://en.wikipedia.org/wiki/CMYK
Elektrophoretic displays http://en.wikipedia.org/wiki/Electrophoretic_display do not mix light. They work more like paper. So I would expect, that instead of RGB pixels they would mix CMY(K) colors. |