The Japan Display device on the web site is slightly bigger, but with almost the same dot pitch (0.1395 vs 0.145), which would mean that for the same pixels, the Japan Display device would be just under 0.8mm narrower and .924mm shorter than the Sharp display. So perhaps the larger bezel is explained by a larger display, of which they're only using the middle pixels, to match the screen pixels of the original Pebble?
Or perhaps they have the volume to get Japan Display to do a custom version with the right number of pixels.
Another difference: The Sharp display take 15uw for a static display, and 50uw for a 1Hz display. The Japan Display takes 130uw for a static display and 160mw for a 1Hz display. That's almost 10 times as much power for a static display!
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