Re: polarized vs nonpolarized sunglasses
- From: luns@xxxxxxxxxxxxxxxxxxxxxxx (Luns Tee)
- Date: Mon, 25 Jun 2007 05:30:52 +0000 (UTC)
In article <ObWdnbRVRMzRoeLbnZ2dnUVZ_viunZ2d@xxxxxxx>,
David L. Johnson <david.johnson@xxxxxxxxxx> wrote:
True enough, but this does not happen in practice. That is, both the
glasses and the liquid-crystal displays are polarized in the same
direction, as long as you are looking at the display "right side up".
If you tilt the display 90 degrees, or tilt your head, the display turns
black, plus any residual stress on the display glass shows up as random
patterns.
Over half of the LCDs I've examined are polarized at a 45
degree angle. This allows using the same polarizer for the front and
back of the screen rather than one horizonal and one vertical. Viewing
through polarized glasses, the screen darkens if you tilt your head one
way, and brightens when you tilt the other way.
-Luns
.
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