It would have to be wide-screen to qualify as HD. It would be pointless or horrible if they tried fitting 720p into a 4:3 format. Either the TV wouldn't render the extra lines, or it would spread the picture out stretching it.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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It would have to be wide-screen to qualify as HD. It would be pointless or horrible if they tried fitting 720p into a 4:3 format. Either the TV wouldn't render the extra lines, or it would spread the picture out stretching it.