# 1080p high definition: Is your house big enough for it?

Discussion in 'NZ Computing' started by zipdisk, Jun 23, 2006.

1. ### zipdiskGuest

Here is the rest of the story though. If you want to view 1080p video in all
its glory on a big screen, it's being said that a 65 inch display is needed,
or your eye cannot pick up the extra detail of all the added pixels. This is
something

http://www.cdfreaks.com/news/13586

zipdisk, Jun 23, 2006

2. ### MutleyGuest

The trouble is my pockets not big enough for it..

Mutley, Jun 23, 2006

3. ### Mark CGuest

wrote in

Yes.
Unless you can afford an absolutely huge screen, 720p seems to be

http://reviews.cnet.com/4520-6449_7-6361600-1.html
| Comparing a 50-inch 1080p DLP set to a 50-inch 720p DLP set, for
| example, he says you'll be hard-pressed to notice more detail
| with 1080i sources, especially from farther than 8 feet away.

Basically, to get any benefit from a 1080 HD TV, when viewed at (say)
3 metres, it has to be larger than (computing...) ~130cmv on the
diagonal (50 inch).

This seems like an outlandish claim, but if I trust the maths (which
tally with web sites I've read), then it is true.

The maths is this: the average human eye can only resolve features as
large as 1 arc-minute (1/60 of a degree).
Plugging in the figures for a 720p TV, gives these set sizes
(diagonals) at these viewing distances:

2.5 metres 107 cmv (42")
3 metres 128 cmv (50")
3.5 metres 150 cmv (59")
4 metres 171 cmv (67")

These figures are the points at which the pixels on the screen are
right at the limit of what your eye can see. If the TV is any
smaller, then the pixels are below that limit. No point in getting a
1080 TV, if the 720p TV pixels are already at the limit.

(Of course, it is not quite this simple...
http://www.normankoren.com/Tutorials/MTF.html#Human_visual_acuity)

Mark

Mark C, Jun 24, 2006
4. ### GraBGuest

One of the many reasons why many people believe the new HD formats
won't take off.

GraB, Jun 24, 2006