Well my bedroom TV is a 19" 720p at 16:9, and is about 7ft away (little annoyed I am having to do things in feet and inches for this, but nm) which works out at 94.3 ppd.
However no signal being sent to it has ever had higher than the DVD/Wii's 480p.
Not sure on your calculations in the OP svennoJ... you claim the calculation is: Horizontal resolution x 0.2 x dist / diag
But then your examples indicate you used 0.02 instead of 0.2
Or for some popular resolutions:
1280x720 = dist x 25.62 / diag
1366x768 = dist x 27.36 / diag
1920x1080 = dist x 38.45 / diag
Ah, hang on, the distance is probably supposed to be in the same measurment as the diagonal (my mistake) and the 0.2 was a mistake and meant to be 0.02.
Which gives my setup as 113.2 ppd... though as I only use a 480p signal I guess I game at 75.5 ppd
