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LG.Philips Develops World's First Color E-Paper

breadbot Very dark sample photo? (188 comments)

I wonder whether this technology is inherently limited to a very steep saturation-brightness tradeoff.

In the picture (provided earlier, by thedohman), the color E-ink panel looks very dark.

Clue: Phillips explains that they made the colors with a plastic overlay.

Speculation: the overlay could be a transparent RGB grid, where each cell transmits (and therefore reflects) only Red, Green, or Blue. Just like an LCD, right? Unfortunately, because it is purely reflective, that would cut its brightness way down, because you'd be blocking most incipient light even in your most-white state. In the simple case, with equal numbers of Red, Green, and Blue cells, the max brightness would be 1/3 of incipient light, since each cell could only reflect its own color. If you, say, threw in a white cell too, you could get at most 1/2 of incipient light, but at the cost of saturation (because your colors would have to be either washed out by the white quarter, or dark because they can only use a small fraction of the total surface for reflection).

more than 7 years ago

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