Commercial Integrator June 2022 - 11

Brought to you with the support of
len Eye Chart. Well, the same math applies
to viewing a screen!
Visual Acuity Distance
Visual Acuity Distance (sometimes referred
to as " Retina Distance " ) is a formulated
calculation of the distance that a person with
20/20 vision must move away from an LED
video display to no longer discern individual
pixels. An example is a 2.5mm pixel pitch
x 3438 (the scale factor of 1 arc minute for
20/20 vision) equals 28.2 feet converted
from mm to feet. What follows are some
examples of visual acuity formula distances:
› 10mm = 112 feet, 10 inches
› 8mm = 90 feet, 3 inches
› 4mm = 45 feet, 1 inch
› 2mm = 22 feet, 7 inches
› 1.5mm = 16 feet, 11 inches
› 1mm = 11 feet, 3 inches
For those who are math averse, a good
rule of thumb is to use a 10x multiplier of
pixel pitch (i.e., 2.50mm x 10 = approximately
25 feet).
Note: The basic math formula for determining
distance is as follows: Pixel Pitch = Screen
Width / Number of Pixels Across. Distance can
be determined by using an angular size calculator,
such as the one at 1728.org/angsize.htm.
It is safe to use the science of visual acuity,
or the 10-times multiplier rule of thumb,
but there are those who claim this is too
extreme. Some claim you can get closer
to the screen than the 10-times multiplier.
And, in some cases, they are right. This
boils down to subjectivity and what kind
of content is being viewed. Although the
science cannot be argued, some will say
that they are fine with viewing images at a
closer distance. They might also say that,
when watching content like full-motion
video, visible pixels are less of an issue. File
that under subjectivity - not science - and
apply it where appropriate in a design. The
key factor here is that viewing distances are
rarely fixed. They span a range of nearest to
farthest viewer. Best practices say to design
for the typical viewing distance and to err on
the side of working from the nearest rather
than the farthest.
Considering Cost
Of course, there is always the issue of
cost to consider. Typically, as you narrow
pixel pitch, the cost of your dvLED
display increases. Ideally, you want the
sharpest images possible, but, at the
same time, you want to make sure you're
not overspending on pixel pitch. At a
certain point, with a large screen and a
distant audience, increasing pixel density
doesn't add anything to the final effect.
So, you might as well stick with a slightly
less dense pitch to avoid unnecessarily
driving up costs. This balance is where the
commercial AV designer comes into play
and adds value.
I like to tell end users that, if you don't
know dvLED, work with someone who does.
You'll be glad you did!
Alan C. Brawn, CTS, ISF-C,
DSCE, DSDE, DCME, DSSP, and
Jonathan Brawn, CTS, ISF-C,
DSCE, DSDE, DSNE, DCME, are principals of
Brawn Consulting.
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commercialintegrator.com
JUNE 2022 Commercial Integrator
11
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Commercial Integrator June 2022

Table of Contents for the Digital Edition of Commercial Integrator June 2022

Commercial Integrator June 2022 - Cover1
Commercial Integrator June 2022 - Cover2
Commercial Integrator June 2022 - 1
Commercial Integrator June 2022 - 2
Commercial Integrator June 2022 - 3
Commercial Integrator June 2022 - 4
Commercial Integrator June 2022 - 5
Commercial Integrator June 2022 - 6
Commercial Integrator June 2022 - 7
Commercial Integrator June 2022 - 8
Commercial Integrator June 2022 - 9
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Commercial Integrator June 2022 - 11
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Commercial Integrator June 2022 - 19
Commercial Integrator June 2022 - 20
Commercial Integrator June 2022 - 21
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Commercial Integrator June 2022 - 25
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Commercial Integrator June 2022 - 44
Commercial Integrator June 2022 - 45
Commercial Integrator June 2022 - Special Section 1
Commercial Integrator June 2022 - Special Section 2
Commercial Integrator June 2022 - Special Section 3
Commercial Integrator June 2022 - Special Section 4
Commercial Integrator June 2022 - Special Section 5
Commercial Integrator June 2022 - Special Section 6
Commercial Integrator June 2022 - Special Section 7
Commercial Integrator June 2022 - Special Section 8
Commercial Integrator June 2022 - Special Section 9
Commercial Integrator June 2022 - Special Section 10
Commercial Integrator June 2022 - Special Section 11
Commercial Integrator June 2022 - Special Section 12
Commercial Integrator June 2022 - Special Section 13
Commercial Integrator June 2022 - Special Section 14
Commercial Integrator June 2022 - 46
Commercial Integrator June 2022 - 47
Commercial Integrator June 2022 - 48
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Commercial Integrator June 2022 - Cover3
Commercial Integrator June 2022 - Cover4
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