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It is mainly the special properties of the polarizing film. The polarizer is able to see the internal stresses in the plastic, so when we usually look at the edge of the mobile phone screen, it will have a colored stripe or a black piece, which is mainly caused by the uneven edge pressure when the screen is installed. It's mostly a matter of light and shade. Wearing a polarized lens to see the LCD screen a tilt will find that the screen darkens, mainly because the polarizing lens can absorb light in a certain direction. The LCD screen is a one-way light (different from sunlight), so it is absorbed, so it is found to be dark.

That's because polarized lenses filter the light from some phones, leaving only black stripes visible.Polarized sunglasses have polarized lenses, and cell phone screens have polarized patches in their components. The polarized film has the function of shielding and passing through the incident light, which can make the longitudinal light or transverse light one kind of passing through, one kind of obscured. Because different phones have different polaroid settings, there will be different shades at different viewing angles. Thanks to a combination of polarizing lenses and lenses, both of which filter the direction of light, the screen can't be seen when the shielding and penetrating parts overlap.

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There is a polarizing plate in the display structure of the mobile phones, which comes from the photoelectric modulation effect of the display screen. There is a polarized light absorption axis in the polarizing plate, which is consistent with the polarized light absorption principle of the polarized sunglasses. If the polarization absorption axes of the two are parallel, the screen can be seen. When they are perpendicular to each other, the light emitted by the screen will be absorbed by the sunglasses, and the light cannot reach the eyes, leading to the phenomenon of the black screen or low brightness. There may be differences in the direction of the absorption axis of the polarizer. So after wearing the polarized lenses, when you see low brightness or black screen, there are two different situations: landscape screen and portrait screen.

Take a mobile phone with an LCD screen, turn it to maximum brightness, and look at the LCD screen through the lenses. Make sure the lenses are parallel to the display, and then slowly rotate the phone. When the true polarized lens is rotated at a certain angle, the light from the display becomes obviously darker, or even pitch-black. If they're not dark, they're not polarized sunglasses.

So I've been tinkering around with the idea of using sunglasses lenses for a cell phone camera filter since I played with the DIY Dashboard Cover and took a photo through some sunglasses to illustrate how the sunglasses reduced the minor glare of the cover. I had really liked the effect, but wanted an easier way to achieve it.

But I wanted to take it another couple of steps out and 1) apply the sunglasses lens idea to my camera phone, and 2) make it an easy to use accessory. This 'ible describes my prototype, but also works well enough as a sort of McGyver solution, too.

The original idea involved a pair of those clip-on sunglasses, and that's what I really wanted to use because there was less excess material to deal with. I was just too cheap to experiment on a pair of $15 clip-ons (which I know is already kinda cheap, but I'm on a budget here). So I found a pair of polarized sunglasses at the thrift shop for $4 and used those.

If you use the full frame kind, clip them apart, and also remove the nose cushion. You'll essentially have a sunglasses monocle. You'll also want to cut the temple (the arm attached to the lens) in half, or even a little less than half.

There's a couple of different ways to do this. I experimented with a few different kinds of clips, rubberbands and the finally settled on the silicon wristband (these things are handy, and also make nice mini-bugee cords). You can set it up so your monocle sunglasses lens closes down over your phone camera lens from the top or from the side.

Because there's still a bit of the sunglasses temple attached, to make use of the existing hinge, having the lens come down from the top might be less desirable than from the side, since the temple piece will be right in the middle of your field of view on the screen.

If you have close from the side, then the temple arm is just at the top of your screen, or along the side, depending on how you're taking your photo. I found that I liked tucking the sunglasses lens under my fastener when I closed it. That keeps it snug against the camera.

The differences in the two shots here are subtle but interesting. In the sky scene, the first shot (somewhat greener) was taken with the sunglasses filter, and the second without. As happens with polarizing sunglasses, you get more detail in the clouds. In the flowers, the differences are harder to distinguish, but in the first shot, taken with the filter, the colors pop a little more evenly, and you can see more even texture in the sidewalk at the lower left.

Thrift shop sunglasses provide a fairly inexpensive way to tinker further, which I fully plan to do. Ultimately, I'd like to find or make something akin to the eye doctor's multiple lens set up, to attach to the cell phone and just flip through lenses as desired.

The Tempo offers slightly better sound and battery life than the more traditional-looking Tenor and Soprano (see below). The Tempo has better specs all-around, with USB-C charging and larger 22mm drivers. These Bluetooth sunglasses also deliver up to 8 hours of battery life, and have simple one-touch volume control so you can adjust your music on the fly. Bose sunglasses are made of the polarized lens and they are prescription, or Rx ready, meaning you can select Bose Frames with your prescription lens.

These wireless Bluetooth sunglasses are IPX4 water-resistant (meaning they're splashproof) so you can use them for running. Audio glasses work well for running and biking, because they leave your ears open so you can hear traffic. Battery life is rated at up to 5 hours at moderate volume levels, and additional polarized lenses are available for $30.

Like the Tempo, the Tenor and Soprano are part of Bose's line of second-generation audio sunglasses. While the Tempo is more sports-oriented, these models are designed to look like regular glasses. (You can still run or bike with them but they're not rated for water- or sweat-resistance.) They're slicker-looking than the original Bose Alto and Rondo Frames, and they have a glossy finish. The Tenor fit my face better than the Soprano, which -- as the name implies -- Bose is aiming at women who like oversized sunglasses. Anecdotally, my daughter likes them.

Bose improved the sound in the Tenor and Soprano, and the battery life is better. It's up to 5.5 hours instead of around 3.5 hours, charging with a pogo-pin cable rather than USB-C. Both pairs of sunglasses play a little louder than the original Frames, and the bass response is better, so music sounds fuller and richer. Don't expect the big bass you get from a standard set of headphones, though, and they can distort at higher volumes. Still, the sound is significantly better than what you get from even the best bone-conduction headphones like those from AfterShokz, which developed a pair of audio sunglasses but never shipped them out.

Like the Tempo, Bose has also upgraded the voice-calling capabilities in these models, adding dual beam-forming microphones. These smart sunglasses allow you to take calls on the go, hands-free. Bose offers optional lenses for $39. Since these sunglasses have a more traditional design, more online replacement lens sites -- including replacerxlenses.com, Lensabl and overnightglasses.com -- can fit them with Rx lenses. 

Bose improved the sound in the Tenor and Soprano, and the battery life is better. It's up to 5.5 hours instead of around 3.5 hours, charging with a pogo-pin cable rather than USB-C. Both pairs of sunglasses play a little louder than the original Frames, and the bass response is better, so music sounds fuller and richer. Don't expect the big bass you get from a standard set of headphones, though, and they can distort at higher volumes. Still, the sound is significantly better than what you get from even the best bone-conduction headphones like those from AfterShokz, which developed a pair of audio sunglasses but never shipped them out.