Are they OLED? Beacause, AFAIK, OLED are not polarized...
Bye Jack
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6 years ago
About LEDs and LCDs
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On a sunny day (Wed, 11 Oct 2017 07:45:02 -0700 (PDT)) it happened snipped-for-privacy@gmail.com wrote in :
Don't know.
Mine are... (the little blue ones). Somebody else already explained why.
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I believe Automotive LCD are circularly polarized for this reason. Cell phones are, too.
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last time I wors polarised glasses in a car the windscreen (or the sky as seen through the windscreen) had vertical stripes on it.
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On a sunny day (Wed, 11 Oct 2017 21:03:52 -0400) it happened snipped-for-privacy@notreal.com wrote in :
Not my old Nokia.. My HTC android changes from almost normal to purple (rotate glasses one way) to greenish (the other way), much looks BW and some text dis-appears. Other Nokia goes black at 45 degrees.
Yours?
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Jan Panteltje wrote on 10/12/2017 3:19 AM:
I've never heard of a circularly polarized lens. Do they exist? I don't believe it would work with an LCD. They operate by blocking the light in one polarization and allowing the LCD crystal to rotate the polarization plane of the light source so it can be seen, or not. To do this with circular polarization the LCD would need to reverse the circular polarization which I've never heard of it being able to do.
-- Rick C Viewed the eclipse at Wintercrest Farms, on the centerline of totality since 1998
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On a sunny day (Thu, 12 Oct 2017 13:07:04 -0400) it happened rickman wrote in :
Agreed, the liquid crystal rotates the polarization, so how can that stop circular? But indeed the android is different. It almost looks if they use H polarization for red and V polarization for blue or something. Curious.
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Automotive Nokia? "Old"?
I don't have polarized sunglasses now but I believe my Note-5 is visible (I don't remember any problems) I know most automotive displays are, certainly anything safety related would have to be.
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You would be wrong, as usual, of course.
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On Thursday, October 12, 2017 at 10:19:05 AM UTC-7, Jan Panteltje wrote: ...
t n
blue or something.
OLEDs can use circular polarizers to increase contrast. They don't need po larizers for their basic operation.
The light from the OLED is not polarized and only goes through the polarize r once to the viewer.
Ambient light gets circularly polarized when it enters the polarizer. When it gets reflected off the OLED its polarization gets reversed so it gets b locked when it attempts to go back through the polarizer out to the viewer. This gives a good dark background.
As far as I know all LCDs use plane polarizers - they can be crossed or ali gned depending upon the nature of the liquid crystal and intended operation of the LCD.
kevin