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It's the original Pixel Qi screen, developed exclusively for the One Laptop Per Child program. The new commercially-available Pixel Qi screens are improvements of the same technology they used on the OLPC. The main improvement seems to be full RGB subpixels for each pixel on the display. The original Pixel Qi screens on the OLPC lacked subpixels and each pixel was limited to a single color by the color filter layer between the transflective layer and the backlight. This improved color fidelity and better contrast appear to be the main improvements for the newer versions.
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