TV Viewing Distance Guide

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iewing Distance Guide: Is it just a matter of personal preference? http://www.practical-home-theater-guide.com/Tv-viewing-dist

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Home Theater Design - TV Viewing Distance Guide

Updated: December 6, 2012


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Sony KDL-55HX850 LED LCD TV

The Sony KDL-HX850 series is considered by

many technical analysts as the best LED TV

series for 2012 thanks to its videophile-grade

picture, extensive features, and a more affordable

price than flagship models from Sony and Sharp.

For information on the HX850 series, please

refer to our 2012 Sony LED HDTV Reviewpage.

TV Viewing Distance and Screen Size

A Guide to Correct TV Placement

for the best seating position

Optimum TV viewing distance is all a matter of screen size and image resolution, but not only... The TV size

will also determine the maximum seating capacity of your home theater room if you want that all viewers

enjoy an immersive experience.

In this guide, we see how the TV size relates to the optimum viewing distance, image resolution and equally

important, multiple-row seating in the home theater. The whole scope is to help you determine the correct TV

placement - or rather the best seating position - for a truly immersive experience.

Optimum Viewing Distance for the best TV viewing experience

Many home theater owners are tempted to go for the

biggest screen size they can afford when buying a big

screen TV for their home entertainment. Others

simply go for a TV size they think is big enough

simply because it is bigger than their older TV!

Yet, there are more important considerations thatcomes into play when choosing your TV size...

Is the TV screen size big enough for your viewing

distance and seating capacity?

If budget is an issue, should you opt instead for a

lower-spec model in favor of a bigger TV?

If you are after a truly immersive TV viewingexperience, you cannot just pick up the TV size you

want since the optimum TV screen size is directly

related to the available viewing distance.

And as we will show, there are more factors that need

to be taken into consideration in this TV viewing

distance - screen size equation. But don't worry!

We simplify the whole process for you by presenting a


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Watching TV!(Picture by E. F. Baumgardner 1958)

few basic principles you can follow to determine the

best screen size for your room as applicable to 2D TV

viewing. We specify here the issue of 2D as with 3D

TV viewing, things are slightly different due to other

constraints come into play. We discuss the subject of

3D TV viewing in our article '3D TV Viewing Distance

Explained' appearing under the 3D TV section of the

site. It analyzes the principles as derived in this TV

guide but applied within the limitations imposed bywhat is know as the 3D TV comfort zone.

Article continues after this advertisement.

TV Viewing Distance: Some say it is all a question of personal preference, but is it really so?

Sit too close to your big screen TV and you will

be able to see the image build-up structure -scanning lines or pixels forming the image

thus distracting your attention and spoiling

your home theater experience. Sit too far away

and the impact will be lost.

There are differing opinions on the best way to

determine the optimum TV viewing distance

for a specific screen size. Just go to the movie

theater and you will soon realize that a lot of

personal preference comes into play. Some will

sit at the very back; others go straight to thefront row for a bigger picture and a wider angle

of view, while some simply choose their seat

randomly somewhere between these two

extremes.

The truth is that there are no scientific rules her. However, this does not mean there are no guidelines to

follow when planning a big screen TV purchase for your home theater room or home entertainment.

SMPTE and the THX Certification Standards

The Society of Motion Pictures and Television Engineers (SMPTE) recommends that the screen size in thehome theater should occupy a minimum of 30 degrees field of view in the horizontal plan at the seating

position. This implies the ideal TV viewing distance should be adjusted such that the extreme ends of the

screen width occupies a minimum angle of 30 degrees at the viewer, corresponds to a viewing distance that is

1.87 times the screen width.

This 30-degree viewing angle has been accepted by many as the standard in home theater design and motion

picture viewing.

THX Certification:The THX certification standard specifies a range rather than just a minimum angle. THXrequires the back row of seats to have at least a 26 degrees viewing angle and while the nearest seating


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position should correspond to an angle of view that is no more than 36 degrees.

It is believed that within these viewing angle limits, the viewer will enjoy a more immersive viewing

experience. These subtended angles correspond to a TV viewing distance that varies between 2.17 and 1.54

times the screen width.

Vision System Limitations

Both SMPTE and THX specify a viewing angle - or a viewing range in the case of THX- that yields a goodseat.

But how does correct TV placement relates to the viewer's vision system, more specifically, how does TV

viewing distance relates to a person's visual acuity?

The issue with visual acuity does not deal with the optimum viewing distance, rather this represents the

maximum viewing distance beyond which some picture detail will be lost as a result of the limitations of

one's eye sight.

Technically speaking, visual acuity is a measure of the eye spatial resolving power and indicates the angular

size of the smallest detail that a person visual system can resolve.

A person with 20/20 (or 6/6 when expressed in meters) normal vision can resolve a spatial pattern where each

element within the pattern subtends a visual angle of one minute of arc angle i.e. 1/60th of a degree at the eye

when viewed at 20 feet away. This represents the minimum angle of resolution (MAR). Expressed differently,

a person with normal 20/20 vision is capable of identifying an object with a height of 0.0698-inch or 1.77mm

at 20 feet way.

From a TV viewing distance perspective, visual acuity represents the point beyond which some of the picture

detail will no longer be resolved by the viewer vision system, as it will appear to blend with adjacent picture

information. In practical terms, this implies that the smallest element comprising the image - the pixel - shouldhave a size that is not smaller than 0.0698-inch when viewed from 20 feet away.

Translating visual acuity limitations in terms of minimum image size when viewing takes places from 20

feet away would give:

For NTSC standard definition TV, minimum image width is 640 x 0.0698", or approximately 45-inch. This

gives a maximum viewing distance that is 5.37 times the screen width.

Similarly, for HDTV, this gives a minimum image size of 89-inch for 720p HDTV (1280 x 720 pixel image)

and 134-inch for 1080i and 1080p HDTV (1920 x 1080 pixel image.) In terms of screen width, these image


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sizes correspond to a maximum TV viewing distance that is 2.7 times for 720p, and 1.8 times the screen width

for 1080p HDTV.

In other words, you would not be able to enjoy the full benefits from the higher pixel count associated with a

1080p HDTV if you were to sit further away than 1.8 times the TV screen width from your HDTV. This

means that if you were to increase the TV viewing distance to 2.7 times the screen width, the picture detail

from a 1080p HDTV will appear just the same as that from a cheaper 720p HDTV of the same screen size!

What does this mean in practical terms?

We have already hinted on a simple way of relating viewing distance to screen size as resulting from

SMPTE/THX recommendations and visual acuity limitations.

To make things easier, we have come up with a rule-of-thumb that can help put in practice the guidelines

detailed above. This guiding principle for TV viewing distance refers to the screen width rather than the

screen diagonal since all is related to the subtended viewing angle in the horizontal plan. Furthermore,

referring to the screen width has a further advantage - namely that it applies to any screen irrespective of its

aspect ratio, whether that being 16:9 or 4:3.

The '2-to-5' Principle

For optimum TV viewing distance, the nearest seating position should be limited to approximately twice the

screen width, while the furthest seating position should be no more than five times the width of your screen.

This should give a fairly good approximation for your TV viewing distance. Note however that it does not

necessarily represent the ideal viewing distance in a home theater setup; rather it represents the limits within

which your TV viewing distance should theoretically be out of the trouble zone.

In other words, move closer than twice the screen width, and the picture scanning lines, pixel breakup and

any other video artifacts will become too visibly intrusive, leading to distractions that will spoil your movie

watching experience. Move further away than 5 times the screen width and your vision system will no longer

be able to resolve all picture detail.

It is important to realize that...

These maximum and minimum TV viewing distances should be seen in the light of the video signal definition.

A fully resolved high definition TV signal (1080i or 1080p, 1920x1080) supports a closer viewing distance

than standard analog TV.

Thus while one-and-a-half to twice the screen width would represent the ideal TV viewing distance for anHDTV 1080p display, it would be too close for standard television viewing. In the case of standard

definition, sitting at more than three times the screen width represents a better option.

Similarly, the five times the screen width as the maximum TV viewing distance, while more than adequate

with standard definition video, is too far away for a person to see the fine detail supported by 720p and 1080p

HDTV. Thus, when it comes to HDTV content, three times the screen width represents a more practical

limit for the maximum viewing distance.

Note: Our rule-of-thumb for minimum and maximum TV viewing distance applies irrespective of the screen

size, yet it works best with TV sizes in excess of 40-inch diagonal.


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Anything smaller than this is too small to qualify as a big screen home theater option. At the smaller screen

sizes, even if one were to stay within the optimum viewing distance as specified by SMPTE or THX, it would

still be difficult to get a truly immersive viewing experience.

Maths not for you? No problem!

The following table gives the recommended minimum and maximum viewing distance for different 1080p HDTV

screen sizes:

TVScreen Size

(Inches)

MinimumViewing Distance

(feet)

MaximumViewing Distance

(feet)

40 4.4 8.7

42 4.7 9.1

46 5.1 10

50 5.6 10.8

52 3.8 11.3

55 6.1 11.9

60 6.7 13

65 7.2 14.1

Optimum Viewing: Vertical Angle of View and Screen Height

There is more to optimum viewing than just a consideration based on the TV viewing distance. For a mostcomfortable viewing experience, optimum viewing would result when the eyes of the viewer are level with

the center of the screen.

Maximum vertical angle of view: Where this is not possible, the SMPTE guideline suggests that the

maximum vertical angle measured at the seated eye height from the front row center seat to the topmost part

of the TV screen of projected image, should not exceed 35 degrees. This does not represent the optimum

vertical viewing angle but rather the limit beyond which the viewer will be subject to an increased neck strain.

This maximum vertical angle limit is always measured from the front row as this represents the extreme angle

of view.

Minimum vertical angle of vision: While there are no specific SMPTE or THX guidelines, studies have

shown that if the TV screen size is such that its height occupies less than 15 degrees of the viewer's vertical

field of view, than the image would appear small.

A Few Practical Considerations:

In a typical home theater set-up, it is extremely unlikely you will have to worry about the maximum or

minimum vertical angle of view for an effective movie theater experience if you were to mount your screen at

the correct height.


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Adhering to the recommended TV viewing distances detailed above would automatically imply compliance

with the minimum vertical angle of vision. In other words, the fixed relationship between screen height and

width as determined by your HDTV or projected image aspect ratio simplifies this whole issue.

Similarly, the same argument holds true for the maximum vertical angle of view beyond which the viewer will

be subject to an increased neck strain. Remember however -you have to stay within the minimum TV viewing

distance detailed in our calculations, i.e. no more close than 1.54 to 2 times the screen width.

On the other hand, if you were to wall mount an LCD or plasma over the fireplace and sit too close to the TVscreen, there is a real risk of approaching the recommended 35 degrees maximum vertical angle of view, thus

subjecting the viewer to increased neck strain.

TV Viewing Distance and Multiple-Row Theater Seating

This discussion on TV viewing distance would not be complete without explaining how the conclusions we

have arrived at, applies to multiple-row seating in the home theater.

As indicated earlier on in this discussion, THX recommends a viewing angle ranging from 36 deg. maximum

to 26 deg. minimum; within this range, every seat can be considered theoretically as a good seat.

However, whether one can really sit at such a close TV viewing distance resulting in a field of view of 36 deg.depends on the quality of the video content and the pixel screen resolution.

Multiple-row seating in the home theater and Screen Size

The maximum number of rows in a home theater depends not only on the floor area, but also on the screen

size, or rather the relative size of the screen width, with respect to the size of the theater seats.

Just to clarify further: Assume you are using standard home theater seating; you will need approximately

44-inches per row. A 16:9 screen with a width of 100-inch would easily accommodate a third row while

remaining within the 36-26 deg. range limit defined by THX.

However, simple calculations show that if you were to move to a smaller screen having a 65-inch width

(75-inch diagonal for a 16:9 screen), you would not be able to fit in a third row.

Rule of thumb: Divide the screen width in inches by 30 and then round off to the nearest integer. The result

will correspond to the maximum number of rows afforded by your screen size; this applies for standard size

theater seating.

More information on the issue of multiple-row seating in the home theater is available in our Home Theater

Seating Guide.


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Article Content

Issues discussed in this viewing distance guide:

SMPTE Rec., the THX Standard, and Visual Acuity: Analyzing the various recommendations and vision

system constraints to arrive at the best TV viewing position.

Optimum Viewing: Vertical Angle-of-View and Screen Height for comfortable TV viewing.

Viewing Distance and Multiple-row Seating: How does our discussion relates to multiple row seating in a

typical home theater environment?

Optimal Viewing Distance for an Immersive 3D Experience: 3D imposes even more constraints on your

TV viewing distance. Not only, your 3D TV screen size and TV viewing angle also play an equally important

role in delivering a realistic 3D experience.

Editor's Note: This article should also be seen in the light of our discussions on multi-channel correct

speaker placement and home theater seating.

HDTV & Projector Reviews

Reviews published on Practical HT Guide

Plasma TV Reviews 2012 Update

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LCD TV Reviews - 2012 Roundup

Rear Projection TV Reviews2012 Update:

Best HDTVs for 2012

Best Video Projector Reviews

Covering the best projectors for home entertainment

More Home Theater Guides

Recommended Technical Reading

Home Theater Design:

Home Theater Design Basics


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Home Theater Room Size

The Dedicated Home Theater

Room Acoustics and Soundproofing

Home Theater Lighting

Equipment Placement

Speaker Placement

Home Theater Seating

Home Theater Decor

Use of Tactile Transducers to feel the bass!

Home Theater Wiring

TV Installation Guides:

HDTV Installation Basics

Choosing the Right TV Mount

Installing a TV Wall Mount

TV Installation over the Fireplace

Wiring Channels in HDTV Installations

Back to:

- HT Design Section Index

Suggested further reading:

- 3D TV Viewing Distance Explained

- Home Theater Seating Guide

- Correct Speaker Placement

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