Whereas existing clamshells cover up the main screen when closed, Sony Ericsson's new design would enable the screen to be on display when closed, then flipped over in more traditional clamshell style when open .
This has the benefit of protecting the camera lens when the device is closed (assuming the camera is positioned on the reverse of the screen), as well as avoiding the need to add a smaller screen on the outside of the phone, as is currently the case with most clamshell designs. Removing the second screen obviously reduces the number of components in the phone, keeps costs down, and also leaves extra room for additional features (which mobile phones always need!).
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