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Originally Posted by pdurrant
That's odd. The contrast ratio for the B/W version is the same as for the colour version. I don't think that can be right. It ought to be higher. I wonder if their 'greyscale' display is just their colour display being driven as greyscale.
(I'd have expected the B&W version to be 454ppi and better than 1:20 contrast ratio.)
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Quote:
Originally Posted by PorcupineLTD
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This is already worth noting out of the new interviews:
it seems that the B/W is akin to an emulation of the EPD tech as we know it, through lowering the framerate and (maybe? Why a forced B/W is not clear) optimized subpixel control, to achieve an even greater power efficiency. The displays can go 33fps, but reduced framerate decreases power consumption. Which would confirm they are close to purely bistable displays - pixel status change has an impacting cost.
Which also suggests that the final resolution is 227ppi, and the subpixel one 454dpi. The grayscale mode is their colour display being driven as greyscale with a lower framerate.
There is no increase in contrast ratio, because the filter is still there.
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The only thing we have done in the black and white mode - and we don't even have to do that to realize the black and white content - all we're doing is, to get more usage on the single charge, like get it even lower power, we're just reducing the frame rate, and that is what is necessary in those types of applications; but you could get the frame rate up and that'll not impact the contrast or the brightness or any of those. [20:18]
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Also: soon after it is made clearer (as expected) that the switch is user controlled:
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This particular version is not bistable: the technology has been demonstrated in a bi-stable mode but the company is not developing a bi-stable product at this point [as] the need in the market is video product. It is still significantly lower power [...] If you use it let's say for about 5 hours everyday in a reading mode it will last for a month and if you use it for 5 hours everyday in a video mode it will last for maybe nine or ten days.
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