Mirroring not full screen using Digital AV Adaptor

I plugged in my iPad 2 last night to my Samsung 50 inch TV. It showed up full screen, then I rotated the iPad and it has only been using half the screen on the TV. Rotate it back and still half the screen. It shows 1080p on the TV. Rebooted iPad and TV with no change. I also tried a smaller Westinghouse TV with the same results.this mirroring would have been cool if it was full screen. The manual on page 168 says it's 1080p and video is 720p. I tried several apps, abc player, Netflix, and safari.