There are no set rules regarding the relationship between the size of the room and the size of the image. Remember that a larger screen is not always better.
The "old" SD system was that the viewing distance six times the amount needed to exemplary diagonal. For people with an average viewing power lines, the image no longer shown separately and the optimal image. But the advent of High Definition has changed. The larger number of video lines can sit closer to the TV without seeing the lines. Moreover, the aspect ratio (16 / 9 instead of 4 / 3) the width become more important than the height. The rule applies to a widescreen (LCD or Plasma) TV an optimal viewing distance of three times the screen diagonal.bron: allesoverhomecinema.com
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