The biggest improvement is the screen it displays text at 265 dots per inch (dpi), compared with the Kindle Paperwhite's 212 dpi or the Nook SimpleTouch's 167 dpi.

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Such big spending could give Apple a jump on a new display technology known as IGZO (indium, gallium, and zinc) that can achieve a resolution of 330 dots per inch while reducing the thickness and power consumption.

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Dr Sheridon and his colleagues have created prototype displays with more than 200 dots per inch (80 dots per centimetre) about twice as fine a resolution as most laptop screens, but only half as clear as a decent laser printer.

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Dye sublimation is a printing technology that uses layers of transparent color dye, special dye-receptive paper and a heated printing head to create images that are pretty close in quality to conventional photographic film and paper--up to 16.7 million colors and 403 dots per inch by 403 dots per inch.

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Western blot tests are frequently altered to remove backgrounds, enhance contrast and increase dots-per-inch resolution so they are suitable for publication.

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