Why you can’t see the iPhone screen with polarized sunglasses?

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Why you cant see the iPhone screen with
polarized sunglasses?
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Why you cant see the iPhone screen with
polarized sunglasses?
Recently many people complained that they cant
see the iPhone screen when wearing a polarized
sunglasses after replacing the China made iPhone
screen and they thought the problems maybe lie in
the China made screens quality. In order to
figure out why exactly did this happen, weve
collected some information to share with you to
explain this issue briefly. First we need to
know the structure of the LCD screen and how it
works! As you can see from the picture above,
each LCD screen contains backlight unit, rear
polarizer (near to backlight unit), TFT array,
liquid crystal, color filter and front polarizer
(near to screen display).
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What related mostly to our problem here is the
polarizers, which is used to filter the lights
and allows the light of specific direction to
pass and effectively eliminate the extra glare
and it plays an important role in display image
quality and performance. Speaking of the
polarizing film, we need to know the working
principle of the polarizer which allows just the
specific direction lights to go through, thus you
see only the polarized lights from your screen
and it cant be recognized by our naked eyes,
which we can tell by wearing the polarizer
sunglasses. When you put the 2 pieces of
polarizer in perpendicular angle you cant see
any lights through. And when you wear the
polarized sunglasses, that means you put another
polarizer on, just like the pictures showed
below, which explained why you cant see the
screen in specific angle. This two polarizers
here are just like you wearing the polarized
sunglass to look at the screen. The front
polarizer is equal to your polarized sunglasses,
and the other polarizer is equal to the one in
your phone (the one near the display), you can
see the magic cube clearly when the 2 polarizers
are parallel to each other, as the angle changed,
the less lights can pass through, the magic cube
seems to fade away, and when this 2 pieces of
polarizer are perpendicular to each other, you
can hardly see the magic tube.
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Here we found some other cellphones also
encountered this phenomenon. Like Samsung galaxy
S5, when you put it at 45, the screen is all
black, other angles are fine. For MeiZu MX3, you
can see it clearly in 90,however when you put it
horizontal, it gets black. For our most
concerned iPhones, the iPhone 5 and 5S, you can
see it in all angles with no problem, except for
the 5S screen are tending to be yellowish and
reddish. And for iPhone 6 series, there is only
little discoloration on the screen. As we know
that Apple has improved the screen polarizer in
iPhone 6 series which can be explained briefly
with below picture, actually adding a
quarter-wave plate within the screen can turn the
linear polarized light into circular polarized
light, so the lights can spread from multiple
directions, thus you can see the screen in every
angle. Luckily, LCD display technology has been
quietly evolved in recent years, more and more
cellphones are tending to improve their screen
technology, the polarizer issues can hardly be
found in smart phones now.
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Conclusion For the China made iPhone screens,
most of the factories have used third party
polarized films instead of OEM one because of the
cost. According to our research, you may
experience this problem in nearly half of all
China made iPhone screens. As it's summer time,
more and more customers would wear sunglasses
while using the phone. We suggest you to test all
your screens before installation.
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Read the complete story, follow the link below
Why you cant see the iPhone screen with
polarized sunglasses?
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