TV Viewing Distance and Screen Placement in the Home Theater
The most advantageous television screen size is totally related to the available viewing distance. Then again, there are other aspects as well that should be taken into account.
Viewing Distance: Is it simply a subject of individual liking?
Be seated excessively near your big screen TV and you will be able to discern the image build-up structure – scanning lines or pixels figuring the image, thus off-putting your attention and destroying your home theater experience. Yet, be seated extremely far away, and the impression will be gone.
The fact is that there aren’t any precise rules here. This doesn’t signify that there aren’t any principles that you need to go along with when preparing for a huge screen purchase or a probable home theater area.
SMPTE Recommendations and the THX Certification standards:
The Society of Motion Pictures and Television Engineers (SMPTE) proposes that the screen size for home theater use must occupy a 30 degrees area of view – in the horizontal plan – for the watchers. On the other hand, the ultimate TV viewing distance ought to be such that the screen width occupies an angle of 30 degrees from the viewing point.
This SMPTE principle is additionally corresponding to the THX certification standards in that these recommend that the backside row of seats needs to have no less than a 26 degrees watching angle and while commending a finest watching angle of 36 degrees.
So How Does All This Translate In Practical Terms?
A common rule for the TV viewing distance based on the SMPTE and visual acuity guidelines, is that the nearest TV viewing distance between you and your big screen TV has to be restricted to nearly twofold the screen width (more exact 1.87 x screen width for a subtended angle of 30 degrees), while the farthest distance being no more than five times the width of your screen.
However, it is also crucial to comprehend that these maximum and smallest viewing distances need to be appreciated in the light of the video signal definition.
A totally resolved high definition TV (1080i, 1920×1080) supports a closer viewing distance than ordinary analog television. While two times the screen width would be the perfect television viewing distance for a HDTV display, it will be a bit too close for normal television; in the later case, a three times the screen width would be a better selection.
When it speaking about the use of regular-size standard definition analog televisions in the home theater, i.e. about 36 / 40 diagonal, the optimum watching distance range is between 8 feet and 12 feet. television sets lesser than 36-inches aren’t big enough to be eligible for Home Theater utilization as their tinier screen size would not impart the preferred impression on the viewer.
Vertical Angle of View & Screen Height:
For optimal watching, the sight of the viewer must be leveled with the middle of the screen.
Maximum vertical angle of view: In those home theater set-ups where this isn’t achievable, the SMPTE guidelines propose that the maximum vertical angle measured at the seated eye height from the front row center place to the top most part of the projected picture must not go over 35 degrees.
This doesn’t stand for the most favorable viewing angle but rather the threshold beyond which the watcher will be put through a heightened neck strain.
Minimum angle of vision: While there don’t seem to be any certain SMPTE or THX principles in this regard, investigations have proven that if the screen size occupies under 15 degrees of the viewer’s vertical field of view, then that image turns out to be small.
Practical Considerations:
In an ordinary home theater set-up, you do not have to really be anxious on neither the maximum vertical angle of view, nor regarding the tiniest vertical angle of vision for a successful movie theater experience.
If you were to follow the recommended television viewing distance of twice the screen width (as further listed above based on the SMPTE principle of 30 degrees horizontal field of vision), you would necessarily be obeying the smallest angle of vision. The grounds behind that is there is a permanent relationship between screen height and width in accordance to your home theater screen aspect ratio of either 16:9 or 4:3.
Bearing in mind that the largest part of home theater rooms are around 10 feet (3m) high, the ensuing vertical viewing angle is average well within the maximum of 35 degrees detailed in the SMPTE guidelines, all you should do is only remain within the two times the screen width guideline for your watching distance.
For more information about TVs and general technology check this Jix Technology Blog.
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