Optimum size of the TV screen is directly related to the distance available for viewing - but there are other factors to consider. View Distance: It 'only a matter of personal taste? Sit too close to the big TV and be able to picture the building structure - scanning lines or pixels in the image - thus distracting your attention and enjoy your home theater experience. But they are too farand the effect is l [...]

Optimum size of the TV screen is directly related to the distance available for viewing - but there are other factors to consider.

View Distance: It 'only a matter of personal taste?

Sit too close to the big TV and be able to picture the building structure - scanning lines or pixels in the image - thus distracting your attention and enjoy your home theater experience. But they are too farand the effect is lost.

There are different opinions about the best way to get the optimum TV viewing distance for a given size determining the screen. Just go to the movies and soon realizes that everything is a matter of personal preference - some sat in the back. Others would jump at the forefront, as they increased the screen and a broader view is preferable, while others would simply choose randomly located halfway between these extremes.

TheThe truth is that there is no scientific rules her. This does not mean that there are no guidelines to follow when planning an acquisition or a big screen would-be home theater room.

SMPTE Recommendations and the THX certification standards:

The Society of Motion Picture and Television Engineers (SMPTE) recommends that the screen size for the home theater should occupy a 30-degree field of vision - the horizontal plane - for the public. Alternatively, the idealTV viewing distance should be such that the screen width occupies an angle of 30 degrees in the right position.

These 30-degree viewing angle seems to have assumed, generally regarded as the standard in home theater and movies.

The directive SMPTE is also in line with the THX certification that the standards recommend that the rear row of seats should be at an angle of 26 degrees, and lawyers, while an optimal viewing angle of 36 degrees.

Itthat, within these limits is a better perspective of the viewer lost in the action movie itself.

Vision System limitations:

It 'also the question of TV viewing distance visual acuity. This is not the optimum viewing distance - but it refers to the maximum distance of viewing some details about the picture is lost.

Technically, the visual acuity is a measure of 'eye and shows the spatial resolutionangular size of the smallest detail that could solve an individual system view. A person with 20/20 (or 6 / 6, in meters solving) a territorial model of normal vision from a perspective of one minutes of IE 1/60th degree angle arc saw him in the eye, at a distance of 20 meters. In other words, a person with normal 20/20 vision can identify an object with a height of 1.76 millimeters to 20 meters capable.

Distances in television, these indicate the numbersome of the showcase, will not be solved by the vision system of the viewer.

So how to translate this into practice?

A few lines-of-thumb to help in practice, these guidelines. These rules for viewing distance to screen width, not screen diagonal and therefore applicable to both 4:3 and 16:9 display.

A general rule for TV viewing distance of the SMPTE and visual acuity is based on guidelines thatthe nearest TV viewing distance between you and your large screen TV should be limited, approximately twice the screen width (more precise 1.87 x wide angle for a circular boundary of 30 degrees), while not distance of more than five times the width of the screen.

This general rule is that a fairly good approximation for the distance of TV viewing. Is not necessarily the perfect home theater viewing distance, but the boundaries that your TVViewing distance would theoretically the problem area.

In other words, more than twice the width of the size and image scanning lines, dots, and other video artifacts are too intrusive - that distracts you ruin the film. They continue to move away than 5 times the width of the screen and the vision system will no longer be able to resolve all the detail image.

But ...

It 'also important to recognize,These maximum and minimum viewing distances should be considered in light of the definition video signal.

A fully resolved, HDTV (1080i, 1920x1080) supports a greater distance than standard analog TV viewing. Thus, while twice the screen width would be the ideal way just in front of an HDTV in full screen, it would be a bit 'too close for standard TV, in the case, then three times the width of the screen, the best choice.

The times of five screenWidth of the maximum visibility, while more than adequate for a standard analog TV picture is a bit 'too far for a support person to the smallest detail of a picture HDTV - three to four times the width of the screen displays a practical limit the maximum viewing distance in the case of HDTV.

These rules-of-thumb work best with a large screen TV in the range of 42 inches or more.

If it is similar to the use of standard-definition format standardTVs in home theater, ie up to 36 "/ 40" diagonal, the optimum viewing distance is between 8 feet and 12 feet. TV smaller than 36 inches, are not big enough to have qualified for home theater use, the smaller size of the screen is not the desired effect on the viewer.

Vertical viewing angle and height of the screen:

For optimal viewing of the eyes of the viewer should be level with the center of the screen.

Maximum vertical viewing angle: In the houseTheater situations where this is not possible for SMPTE guidelines, the maximum angle of the projected image vertically on top of the sitting eye height of the front seat middle row can be measured not beat more than 35 degrees.

This amount does not represent the optimum viewing angle, but the subject adjacent to the viewer, a high neck.

The maximum vertical angle is always the extreme measure from the front row, becauseAngle.

Minimum angle: Although it does not seem to have a specific SMPTE or THX guidelines in this area, but studies have shown that when the screen size takes less than 15 degrees vertical field of view, the viewer that the image appears smaller.

Practical Considerations

In a typical home theater setup, not really worry about neither the maximum vertical angle also gives the minimum requirements for the vertical viewing anglecinematic experience effectively.

As one of the recommended TV viewing distance of twice the width of the screen to keep (as described in detail at the top of the Directive SMPTE 30-degree horizontal field of view) is automatically the smallest angle. The reason is that a fixed ratio between height and width of the screen to your home theater aspect ratio 16:9 or 4:3.

And still more: in a typical houseSetup Theater, would be very difficult, the maximum vertical angle from which you are subjected to a greater effort neck crosses.

Since most home theater rooms are approximately 10 feet (3m) is high, the resulting vertical viewing angles and within the normal limit of 35 degrees as specified in SMPTE guidelines - all you have to do is within two times the screen width guidelines to keep your eyes away.

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