Interesting Desire screen discovery

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TheUngeek

924 posts

Ultimate Geek
Inactive user

#101167 25-Apr-2012 16:56

Ok, so there's prob several out there who have noticed this...

Jumped in the car today and stuck the gps speedo on my Desire on.
Flipped the phone into landscape, and the screen turned off! WTF.
Took it out of the holder and portrait screen came on, landscape turned off. Hmmmmm
Exit app and it still did it on home screen. Sonofabitch.. It's broken :(

Took sunglasses off and it worked fine.... WTF?!
Why suddenly can I not see my screen in landscape mode when wearing my sunnies!?

I was confused. Then I remembered I took my screen protector off 2 days ago!
I wear polaroid sunnies so I guess the glare reducing thing affects the Desire screen in landscape! Cousin was with me and same deal with his ideos.

So, screen protectors have another use! Very weird though I though.

Disrespective

1925 posts

Uber Geek

#615028 25-Apr-2012 17:24

Yeah, my SGS2 is affected by this without a screen protector. Oddly, I get best brightness with the phone at about 15 degrees off vertical which is a pain when using it outdoors and when wearing sunnies... It's odd holding at an angle to get the best out of it.

My ladies iPhone 4 does not exhibit this at all however which irritates me somewhat.

oxnsox

1923 posts

Uber Geek

#615035 25-Apr-2012 17:30

It's all to do with the polarization in. your glasses.
If you rotate the phone thru 180 degrees you'll notice that at some angles the screen will be visible and others not.
Turning your glasses upside down would have the same effect but is clearly not as practical.

andrew027

1286 posts

Uber Geek

#615348 26-Apr-2012 12:01

Yes, most commercially available polarized filters use polyvinyl alcohol plastic (PVA) which is stretched during manufactutre to produce long PVA "chains" aligned in one direction. Light filtered parallel to the chain is absorbed, and light filtered perpendicular to the chain passes through.

If you get two pairs of glasses with polarized lenses, hold them both vertically, one behind the other, you'll be able to look right through. But if you then rotate one pair through 90 degrees, it goes black.

I imagine the screen protector is producing a polarizing effect due to how the plastic was made.

Technofreak

6530 posts

Uber Geek

Trusted

#615622 26-Apr-2012 19:22

This sort of thing can happen even without a screen protector fitted, polaroid sunnys can produce the same effect on other screens as well, even some types of glass can have a polarising effect. That's why it's not not recommended for pilots to wear polaroid glasses, they might have issues seeing through the cockpit windows or see the flight deck screens properly.

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