Tv Viewing length and Screen Placement in the Home Theater
Review
The optimum Tv screen size is directly linked to the ready viewing distance - but there are other factors as well that need to be taken into consideration.
Viewing Distance: Is it just a matter of personal preference?
Home Theater
Sit too close to your big screen Tv and you will be able to see the image build-up buildings - scanning lines or pixels forming the image - thus distracting your concentration and spoiling your hometheater experience. Yet, sit too far away, and the impact will be lost.
Tv Viewing length and Screen Placement in the Home Theater
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There are differing opinions on the best way to conclude the optimum Tv viewing distance for a definite screen size. Just go to the movie theater and you will soon perceive that it is all a request of personal preference - some would sit at the very back. Others would go level to the front row, as they prefer the bigger photograph and a wider angle of view, while some would naturally select their seat randomly somewhere in in the middle of these two extremes.
The truth is that there are no scientific rules her. This does not mean that there aren't any guidelines that you should supervene when planning a big screen purchase or a would-be hometheater room.
Smpte Recommendations and the Thx Certification standards:
The society of request for retrial Pictures and Television Engineers (Smpte) recommends that the screen size for hometheater use should occupy a 30 degrees field of view - in the horizontal plan - for the audience. Alternatively, the ideal Tv viewing distance should be such that the screen width occupies an angle of 30 degrees from the viewing position.
This 30-degrees viewing angle seems to have been accepted by many as the accepted in hometheater and request for retrial photograph viewing.
This Smpte guideline is also in line with the Thx certification standards in that these advise that the back row of seats should have at least a 26 degrees viewing angle and while recommending an optimum viewing angle of 36 degrees.
It is believed that within these viewing angle limits, the viewer will get best immersed into the activity movie itself.
Vision law limitations:
There is also the issue of Tv viewing distance based on optic acuity. This does not characterize the optimum viewing distance - rather, this relates to the maximum viewing distance beyond which some photograph detail will be lost.
Technically speaking, optic acuity is a measure of the eye spatial resolving Power and indicates the angular size of the smallest detail that a man optic law can resolve. A man with 20/20 (or 6/6 when expressed in meters) general vision can conclude a spatial pattern separated by a optic angle of one exiguous of arc angle i.e. 1/60th of a degree, at the eye when viewed at 20 feet away. Expressed differently, a man with general 20/20 vision is capable of identifying an object with a height of 1.76mm at 20 feet way.
In terms of Tv viewing distances, these characterize the point beyond which some of the photograph detail will no longer be resolved by the viewer vision system.
So How Does All This Translate In Practical Terms?
A few rules-of-thumb can help put in custom the guidelines detailed above. These rules for viewing distance refer to the screen width rather than the screen diagonal and therefore apply to both 4:3 and 16:9 display formats.
A general rule for the Tv viewing distance based on the Smpte and optic acuity guidelines, is that the nearest Tv viewing distance in the middle of you and your big screen Tv should be exiguous to approximately twice the screen width (more spoton 1.87 x screen width for a subtended angle of 30 degrees), while the furthest distance being no more than five times the width of your screen.
This rule of thumb should give you a fairly good approximation for your Tv viewing distance. It does not necessarily characterize the ideal hometheater viewing distance but rather the limits within which your Tv viewing distance should theoretically be out of the issue zone.
In other words, Move closer than twice the screen width size, and the photograph scanning lines, pixels and any other video artifacts will come to be too visibly intrusive - leading to distractions that will spoil your movie Watching experience. Move additional away than 5 times the screen width and your vision law will no longer be able to conclude all the photograph detail.
But...
It is also leading to perceive that these maximum and minimum viewing distances should be seen in the Light of the video signal definition.
A fully resolved high definition Tv (1080i, 1920x1080) supports a closer viewing distance than accepted analog Tv. Thus while twice the screen width would be the ideal Tv viewing distance for a Hdtv display, it would be a bit too close for accepted Tv; in the later case, a three times the screen width would be a best option.
Similarly, the five times the screen width as the maximum view distance, while more than adequate for a accepted analog Tv picture, is a bit too far away for a man to see the fine detail supported by a Hdtv photograph - a three to four times the screen width represents a more practical limit for the maximum viewing distance in the case of Hdtv.
These rules-of-thumb work best with big screen Tv sizes in the range 42-inches and over.
When it comes to the use of regular-size accepted definition analog Tvs in the hometheater, i.e. Up to 36" / 40" diagonal, the optimum viewing distance range is in the middle of 8 feet and 12 feet. Tv sets smaller than 36-inches aren't big adequate to qualify for HomeTheater use; their smaller screen size will not Supply the desired impact on the viewer.
Vertical Angle of View & Screen Height:
For optimum viewing, the eyes of the viewer should be level with the town of the screen.
Maximum vertical angle of view: In those hometheater set-ups where this is not possible, the Smpte guidelines advise that the maximum vertical angle measured at the seated eye height from the front row town seat to the top most part of the projected image should not exceed 35 degrees.
This does not characterize the optimum viewing angle but rather the limit beyond which the viewer will be field to an increased neck strain.
This maximum vertical angle limit is all the time measured from the front row as this characterize the extreme angle of view.
Minimum angle of vision: While there do not appear to be any definite Smpte or Thx guidelines in this respect, yet studies have shown that if the screen size occupies less than 15 degrees of the viewer's vertical field of view, than that image appears small.
Practical Considerations:
In a typical hometheater set-up, you do not need to easily worry about neither the maximum vertical angle of view, nor about the minimum vertical angle of vision for an productive movie theater experience.
If one were to cleave to the recommended Tv viewing distance of twice the screen width (as additional detailed above based on the Smpte guideline of 30 degrees horizontal field of vision), you would automatically be complying with the minimum angle of vision. The suspect being that there is a fixed relation in the middle of screen height and width in accordance to your hometheater screen aspect ratio of either 16:9 or 4:3.
Further more, in a typical hometheater setup, it would be very difficult to exceed the maximum vertical angle of view beyond which you will be field to an increased neck strain.
Taking into catalogue that most hometheater rooms are approximately 10 feet (3m) high, the resultant vertical viewing angle is general well within the maximum of 35 degrees detailed in the Smpte guidelines - all you have to do is just remain within the twice the screen width guideline for your viewing distance.
Tv Viewing length and Screen Placement in the Home Theater
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