The launch image (or default image) is displayed while your app launches. (If no default image is provided, then a black screen is displayed.)
To include a launch image in your app, add images of the appropriate size for the device, and name them as follows:
Note that the Defaultemail@example.com image is required for an app to display in full-screen mode on the iPhone 5.
Launch images for the iPhone are only accepted in portrait mode. If you want to provide a landscape launch image, create the image and rotate it 90 degrees in an image editor, then save as named above.
iPad launch images do not include the status bar area. You can provide different launch images for each orientation (Portrait, PortraitUpsideDown, LandscapeLeft, and LandscapeRight); consult the Apple documentation for details.