Now that monochrome e-paper is a pretty standard affair, those at the forefront of e-ink technology have moved on to perfecting the real killer app, which is full-color displays. We've already seen a tiny color model from Fujitsu, and a larger, but only two-color offering from Bridgestone, and now Hitachi -- maker of the black-and-white Albirey e-paper -- is showing off a 13.1-inch version of this product will an impressive 4,096-color palette. Apparently the power-saving "RGBW" filter enables the device to display bright whites as well as deep blacks, but the trade-off is the unit's rather underwhelming resolution of just 512 x 384 pixels. Therefore, we probably won't be seeing color eBooks anytime soon, but the low res should be adequate enough for certain types of signage that would benefit from the paper's ability to hold a picture in the absence of power; we think they would look great advertising all the quality products found at Engadget's retail location.

[Via MobileRead]