Polarized lenses and IBooks/iPad

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Level 1

0 points

Polarized lenses and IBooks/iPad

I found a design flaw the other day while playing with an iPad on a display. I happened to have a pair of Polarized Ray Bans on having just come off the street and noticed that when viewing Winnie the Pooh horizontally it looked great. However when I rotated to the single page vertical position the screen became Polarized and looked virtually opaque. Bummer if your sitting by the pool trying do do a bit of eReading. Any comments........... Steve?

macbook, Mac OS X (10.5.3)

Posted on Apr 16, 2010 2:30 PM

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Answer 1

Limnos

Level 10

411,109 points

Apr 16, 2010 2:36 PM in response to ecyfoto

Well, only a design flaw to the extent that that's inherent to LCD screens in general.

http://en.wikipedia.org/wiki/Liquidcrystaldisplay

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Answer 2

Tony2009

Level 1

4 points

Apr 16, 2010 2:43 PM in response to ecyfoto

Heh, it's funny you posted this...just the other day I had my iPad out in the car and was wearing my Ray Ban polarized sun glasses. I turned the screen on, and nothing - black. Held down the power and home button to try and reset and still nothing...I was quite upset that I thought my brand new iPad suddenly died. Then I caught a glimpse of it out of the corner of my eye that was not behind the sunglasses and sure enough, the thing was fine. I have noticed the effect with other screens and displays but the iPad COMPLETELY blacks out for me with my sunglasses.

I'm sure the effect is somewhat different between different makes and models of lenses but I think this just kind of goes along with the turf when using polarized lenses and viewing LCD displays.

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Answer 3

Jon Walker

Level 6

19,467 points

Apr 16, 2010 4:03 PM in response to ecyfoto

However when I rotated to the single page vertical position the screen became Polarized and looked virtually opaque.

If iPad screen is also polarized, then this is normal. (I.e., same as viewing through two polarized lenses placed at right angles to each other.)

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Answer 4

dwb

Level 7

32,920 points

Apr 16, 2010 4:54 PM in response to ecyfoto

The laws of physics can't be broken, not even by Apple.

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Answer 5

ecyfoto Author

Level 1

0 points

Apr 16, 2010 6:24 PM in response to Limnos

Not to this extent. Macbook screen darkens only when rotated 45 degrees. Vertical or horizontal is just fine. Another advantage for Kindle and its ilk.

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Answer 6

T_Bro54

Level 1

15 points

Apr 16, 2010 9:20 PM in response to Tony2009

Funny, this exact thing happened in my car today with my sunglasses on. I thought my iPad was dead.

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Answer 7

ecyfoto Author

Level 1

0 points

Apr 17, 2010 4:38 AM in response to Limnos

Informative though not necessarily accurate. As I mentioned below my macbook screen will darken only when rotated 45 degrees. Vert or horizontal are just fine.

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Answer 8

Limnos

Level 10

411,109 points

Apr 17, 2010 1:06 PM in response to ecyfoto

So that means whoever made the MacBook put the final sheet of polarizer in at an angle, possibly considering that nobody would want to view the MacBook sitting on a corner. The thing is, because the final transmission is polarized it will be filtered out by any polarizer at 90 degrees to it. This is all inherent to the nature of LCD screens. The most they could have done would be to set the second sheet the way they do in a MacBook. Send feedback to Apple through their feedback pages (they don't read this website for this kind of thing).

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Answer 9

Jul 18, 2011 11:17 AM in response to dwb

The laws of physics? Your comment reminded me of a story I once heard about NASA and the ballpoint pen. I don't know if it's true or not but it demonstrates the point. Apparently NASA spent a lot of money designing a pen that would work in zero gravity.... The Russians just used pencils. So, Einstein, why couldn't Apple polarise their screen at an a-typical viewing angle like 45 degrees? Let's not even start talking about quantum mechanics and how that just blows the whole thing up.

Werewolf

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Answer 10

ANOVA

Level 2

265 points

Jul 18, 2011 8:00 PM in response to Wolfie Wolf

Hello Wolfie Wolf,

urban legends live on. If you want to refer

to NASA please write of the square root

function on a calculator.

Space Pen urban legend:

http://en.wikipedia.org/wiki/Space_Pen

I'm sure some tech has taken apart the films

behind the polarizer of an Apple iPad the day

it was released to see why the display is soooo

gooood. Don't get rid of it and thanks for letting

all of us know to raise our sunglasses!

Happy Computing,

A

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