When used with an iPhone 5, does it stretch the output?

iPhone 5 is at 1136x640, so when connected to an HDTV, does the TV get sent a 640p signal, or a 720p signal where everything is slightly blurry from upscaling? If it sends a 640p signal, then you could decide for yourself with the TV's options whether to upscale or leave the image with a border around it.

Lightning Digital AV Adapter

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  • 720p - with black bars when vertical.

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