The patent description is as follows:
"The technology disclosed here maximizes the size of the display area associated with the mobile device by various camera placement. In one embodiment, the camera is placed inside the mobile device, and can pop outside the mobile device when the camera is activated. When the camera is inactive the camera retracts inside the mobile device, and becomes unnoticeable to the user. In another embodiment, the camera is integrated into the mobile device display as a camera icon. The integrated camera serves two purposes: to record pictures, and to act as a camera icon, that when selected activates the camera. By removing the camera from the front side of the mobile device, or by integrating the camera into the display screen of the mobile device, the size of the mobile device display screen can be increased."
Source: Andy Rubin on Twitter, US patent