years ago casio had colour screen organizers, the screens could do blue green and orange but somehow they did this using the standard dot matrix character displays you see in printers, fax machines and the likes, that is, there wasn't 1 pixel per colour but the pixel elements were able to morph between colours much like the t-shirts of the 90's.
what i want to know is, what exactly was happening to get these pixels to colour shift and are these screens still available.
i notice the ipod mini uses a similar system where the screens pixels can go from blank to grey to blue. effectively greating a 4 colour screen with shading.