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The OLPC XO (left) has the biggest screen, measuring 7.5in. across the diagonal; the Intel Classmate and ASUS Eee both have 7in. TFT screens with native resolutions of 800 by 480 pixels.
The XO's screen is an innovative dual-mode TFT that can operate in greyscale/reflective mode to save power, or in LED-backlit colour/transmissive mode (shown here) for maximum image quality. In greyscale/reflective mode, the resolution is 1,200 by 900 pixels and power consumption is 0.1-0.2W; in colour/transmissive mode, resolution is approximately 800 by 600 pixels and power consumption 0.2-1W, according to OLPC.
The XO has a 0.3 megapixel digital camera to the right of the display; the Classmate has no camera, although there are plans to include one in the next version of the system; the entry-level 'Surf' version of the Eee (pictured here) has no camera, but slightly more expensive models have a 0.3 megapixel unit.