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The Sony uses exactly the technology of E Ink. The only difference from the site is that the site description of sub-pixel is simplified by showing on 1/2 white and 1/2 black in the pixel. In fact the sub-pixel can be divided in much smaller granules than 1/2. For example to do 4 gray scale you really need 1/3 granularity. The choices then become all black, 2/3 black 1/3 white, 1/3 black 2/3 white, and white. To do 8 levels you will need even more subpixel division and to do 16 is currently the limit. The sub-granules mix of black and white are interpreted as gray by the human eye.
In a similar fashion you can use yellow/black, or blue/black, etc. to make various shades of any color. Using subpixel shades of each color represented by 2 bits means that each color will have 4 shades and 3 colors will need 6 bits or 64 different colors for the triad. that is how I got to 64 colors.
Dale
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