THATS SO WEIRD!! hahaha i never noticed that. i grabbed my polarized glasses from the closet, dusted them off, and stared at my screen and was instantly mesmerized haha
WARNING if planning to use NAVIGATION wearing polarized sunglasses
- Thread starter drumtrucker
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Since water is clear, the only way we can see it is if there is a reflection of light on the surface. Given the right angle,
polarized lenses can completely eliminate the reflection, not a big deal in a car, but it could be deadly on a motorcycle.
I dont know if it's because my polarised sunglasses are cheap but they dont completely block out the screens on my galaxy tab or one x. They do make the colours a bit dreamy when i turn them between portrait and landscape. I wonder if sunglasses can have either circular or straight polarisation like camera filters and this is what causes the differences?
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Rotate your nexus around, I find my phone is polarised at around a 30degree angle; so works in landscape and portrait with my glasses on, just not at a 30 degree angle!
If it does nothing; then think your sunglasses actually aren't polarised!
Sunglasses should always be polarised the same way (horizontally) as this stops road glare (vertical glare essentially) but screens won't always be polarized in the same way; no reason for them to be.
I wear polarized sunglasses always whilst driving, and the only downside I have is I have a perspex section on my rear windscreen which turns into a rainbow!
I absolutely use mine for navigation, however not in my car. I use mine for aviation navigation with moving map. It is actually extremely accurate. It actually gives you rate of climb/decent too!
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I can't believe there's a 3 page thread on polarized sunglasses. :laugh:
Zz topIt's your sunglasses, not the nexus 7. Get some cheaper sunglasses.
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If anyone's interested in the scientific explanation, here it is:
Light starts out with no polarization. If you use the string analogy to light, non-polarized light is like a string being shaken in all directions - up, down, left, and right. When a polarizer is used it's like feeding that string through a grate. It limits the light (string) to only one kind of motion. If the polarizer is oriented with the grate openings being vertical, the string can only vibrate up and down. All side-to-side vibration is blocked. If you have two polarizers you can control how much light gets through. If the filters are aligned (have their "slots" going the same way), then about 50% of the light gets through. If one of the filters is rotated, less light gets through until the minimum amount is achieved at 90-degrees of rotation. One filter is blocking all the horizontal waves and the other filter is blocking all the vertical waves.
LCD screens work because the "liquid crystal" is a substance that can change the orientation of it's polarization depending on the electric field applied across it. It's like electrically rotating one of the polarizers. All LCD screens start with a polarizing filter blocking all light that doesn't vibrate in the orientation of the filter. Let's say that orientation is horizontal. Now the LCD material starts out being polarized horizontally, so all the polarized light from the other filter goes through. As electricity is applied to the liquid crystal material, it starts rotating it's polarization angle until at some point most of the light is blocked.
Most polarized sunglasses are vertically polarized because the worst types of glare are horizontally polarized. But if your LCD's polarizer is horizontally polarized in the landscape mode, you won't be able to see anything - the vertically polarized sunglasses block out the horizontally polarized light from the display. You must rotate it to the portrait orientation where the display's polarizer is now oriented vertically to match the sunglasses before you can view your display.
If you must use sunglasses with a display, you should consider technologies that don't use polarizers, like LED (AmoLED) or plasma.
(BTW, this type of polarization is called "linear". There is another type of polarization which is called "circular". Photographers will probably know the difference between the two. Circular can be "left hand" or "right hand" polarized. It's what's used in the 3D glasses you get at the movies. Two projectors are shooting two images onto the same screen, but one image is left-hand polarized and the other is right. The benefit of circular polarization is that it doesn't matter if you tilt your head. The left and right images still make it to the same eyes. Unfortunately, there are no liquid crystal materials that can shift circular polarization. Otherwise we could have LCD displays that are immune to being blocked by sunglasses.)
Light starts out with no polarization. If you use the string analogy to light, non-polarized light is like a string being shaken in all directions - up, down, left, and right. When a polarizer is used it's like feeding that string through a grate. It limits the light (string) to only one kind of motion. If the polarizer is oriented with the grate openings being vertical, the string can only vibrate up and down. All side-to-side vibration is blocked. If you have two polarizers you can control how much light gets through. If the filters are aligned (have their "slots" going the same way), then about 50% of the light gets through. If one of the filters is rotated, less light gets through until the minimum amount is achieved at 90-degrees of rotation. One filter is blocking all the horizontal waves and the other filter is blocking all the vertical waves.
LCD screens work because the "liquid crystal" is a substance that can change the orientation of it's polarization depending on the electric field applied across it. It's like electrically rotating one of the polarizers. All LCD screens start with a polarizing filter blocking all light that doesn't vibrate in the orientation of the filter. Let's say that orientation is horizontal. Now the LCD material starts out being polarized horizontally, so all the polarized light from the other filter goes through. As electricity is applied to the liquid crystal material, it starts rotating it's polarization angle until at some point most of the light is blocked.
Most polarized sunglasses are vertically polarized because the worst types of glare are horizontally polarized. But if your LCD's polarizer is horizontally polarized in the landscape mode, you won't be able to see anything - the vertically polarized sunglasses block out the horizontally polarized light from the display. You must rotate it to the portrait orientation where the display's polarizer is now oriented vertically to match the sunglasses before you can view your display.
If you must use sunglasses with a display, you should consider technologies that don't use polarizers, like LED (AmoLED) or plasma.
(BTW, this type of polarization is called "linear". There is another type of polarization which is called "circular". Photographers will probably know the difference between the two. Circular can be "left hand" or "right hand" polarized. It's what's used in the 3D glasses you get at the movies. Two projectors are shooting two images onto the same screen, but one image is left-hand polarized and the other is right. The benefit of circular polarization is that it doesn't matter if you tilt your head. The left and right images still make it to the same eyes. Unfortunately, there are no liquid crystal materials that can shift circular polarization. Otherwise we could have LCD displays that are immune to being blocked by sunglasses.)
>Otherwise we could have LCD displays that are immune to being blocked by sunglasses.
We already have. Tablets/phones are used in either portrait or landscape orientation. Some devices (iPhone) are polarized at 45-deg angle, which avoid the "sunglass blockage" effect. See video:
We already have. Tablets/phones are used in either portrait or landscape orientation. Some devices (iPhone) are polarized at 45-deg angle, which avoid the "sunglass blockage" effect. See video:
Good advice, but AMOLED screens for some reason still have a polarized filter on them. I've had the blacked out screen on my Nexus One, my Nexus S, and my Galaxy Nexus. On all 3 devices, it has been at a 45 degree rotation, so it isn't a huge problem for me in either portrait or landscape... but still there for a display technology that doesn't seem like it would need a filter.
I'd love to know what phone or tablet you've been using that has a plasma display. Battery life on it must be abysmal.
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I noticed this with my HTC Rezound a month or two ago and it threw me off lol
The devices with a nuclear power source in them work great, great picture, never need to plug in, but after a while the radiation burns become a bit of a drag.I'd love to know what phone or tablet you've been using that has a plasma display. Battery life on it must be abysmal.
This is frustrating. I don't suppose there's any kind of film we could put over the screen to convert the polarisation to something else, is there?
I just switched to some quality non-polarized glasses...
I'm somewhat hypersensitive, and I'm also kind of broke. Any recommendations on good sunglasses which won't black out the Nexus 7 screen for less than $100?
I think that the Serengeti Drivers are the best sunglasses for driving that money can buy. While they are normally quite expensive at full retail price, I've often seen them at Big Five for well under $100. Look for the non-polarized modelsI'm somewhat hypersensitive, and I'm also kind of broke. Any recommendations on good sunglasses which won't black out the Nexus 7 screen for less than $100?
Edit: Try amazon, "Drivers" from $74.95
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Hmmm... Can't find any for that price, but it looks like they mainly use a brownish tint. I'm much more inclined towards a blue tint, if anything. I'll have to look around and see what I can find.I think that the Serengeti Drivers are the best sunglasses for driving that money can buy. While they are normally quite expensive at full retail price, I've often seen them at Big Five for well under $100. Look for the non-polarized models
Edit: Try amazon, "Drivers" from $74.95
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