720p or 1080p what size screen starts to make a difference

[mike4scuba]

At what size screen do you actually start noticing a difference in picture quality from a bluray player

is it 19, 22, 26 or larger screens

if its say a 26 screen you notice a difference, then buying a 22 screen would be better in 720p i guess in that option a good dvd upscaler would be as efficient as displaying an image as a bluray player