hpst

I can't, I have no idea either. Optics are weird.

    Seagull With Polaroid glasses i can see HTC is vertical or horizontal polarized, in on position i can see anything, altough in the diagonal i still see that colored shape also presented on circular polarized.

      Seagull but there's the chap who swears by his skinomi matte protector, but doesn't benefit from any other.

      That's ensete

      Also, I see you use Galaxy S3 Mini Seagull that has OLED display? Do you suspect polarization has changed in OLED panels recently?

      Interesting is the Essential Phone which someone reported usable on here might not have this polarization? https://old.reddit.com/r/essential/comments/74nkbz/type_of_polarizer_the_screen_uses_can_you_see_the/

      Someone here says matte screen protector "cancels out" the polarization: https://old.reddit.com/r/Android/comments/4h7qwj/for_those_curious_how_the_htc_10_looks_through/

              ryans

              My experiences with OLEDs has been quite inconsistent. But I do not think the polarisation has changed. It seems that PWM in OLEDS affects me a lot, despite not affecting me in other devices (I have an LED LCD TN laptop which uses low frequency PWM that I can use ok).

              I think the reason I could use the S3 mini was its small size, and favourable PWM (not tested though), but I still can only look at it for a few minutes before pain develops. All the other samsung devices have been much worse, older or newer, I assume due to their aggressive PWM.

              One reason I suspect polarisation is a problem for me in general, is that even completely PWM free OLED phones like the LG Flex 2, and Lumina 650 cause me discomfort. But to a much lesser extent than the others.

                  Seagull the new iPhoneX and XS has also circular polarization similar to my XZ2. I saw it store with my 3d glasses...

                  Can't it be the blue light that affects you?

                      I create this highly speculative theory.
                      Polarization even if is not the main reason of eye strain can have influence to some people.
                      To our eyes:
                      No polarization > 45° polarization > 1 axis polarization > circular polarization.

                      Maybe for people with eye convergence circular polarization might be the worst. Or even vertical/horizontal polarization.

                      Or has nothing to with. The most modern displays are using circular polarization and polarization might just be a form that goes along the development of new displays. 45 degree was older tech, so better. But the main factor here is the old tech not polarization.

                      hpst
                      "A waveplate or retarder is an optical device that alters the polarization state of a light wave travelling through it. Two common types of waveplates are the half-wave plate, which shifts the polarization direction of linearly polarized light, and the quarter-wave plate, which converts linearly polarized light into circularly polarized light and vice versa.[1] A quarter-wave plate can be used to produce elliptical polarization as well."

                      https://en.wikipedia.org/wiki/Waveplate

                        tfouto

                        I am not sure your 3d glasses are appropriate to test whether something is linear to circular polarsied, as they themselves are circular polarised. Might be wrong, but I think its a lot easier to interpret what you see with a linear polarised filter.

                        With a linear filter, if rotating makes the screen go black, the screen is linear polarised. If the screen dims but does not blacken, its circular polarised.

                            Seagull It's the same thing. Sunglasses are usually linear polarized. 3D glasses just react with rotational polarization. With vertical or horizontal dont do anything.
                            I have both glasses, 3D and linear polarized. They only react to their specific polarization.

                            There is also eclipse polarization, altough i dont know if it's used in displays.

                              https://en.wikipedia.org/wiki/Retinal_birefringence_scanning

                              Retinal birefringence scanning
                              From Wikipedia, the free encyclopedia
                              Jump to navigationJump to search
                              Retinal birefringence scanning
                              Medical diagnostics
                              Purpose detect central fixation of the eye
                              Retinal birefringence scanning (RBS) is a method for detection the central fixation of the eye. The method can be used in pediatric ophthalmology for screening purposes. By simultaneously measuring the central fixation of both eyes, small- and large-angle strabismus can be detected. The method is non-invasive and requires little cooperation by the patient, so that it can be used for detecting strabismus in young children. The method provides a reliable detection of strabismus[1] and has also been used for detecting certain kinds of amblyopia.

                              Retinal birefringence scanning uses the human eye's birefringent properties to identify the position of the fovea and the direction of gaze, and thereby to measure any binocular misalignment.

                              Principle
                              Birefringent material has a refractive index that depends on the polarization state and propagation direction of light.[2][3] The main contribution to the birefringence of the eye stems from the Henle fibers. These fibers (named after Friedrich Gustav Jakob Henle) are photoreceptor axons that are arranged in a radially symmetric pattern, extending outward from the fovea, which is the most sensitive part of the retina. When polarized light strikes the fovea, the layer of Henle fibers produces a characteristic pattern, and the strength and contrast of this pattern as well as the orientation of its bright parts depend on the polarization of the light that reaches the retina.[4] An analysis of this pattern allows the position of the fovea and the direction of gaze to be determined.

                              Binocular retinal birefringence has been used for diagnosing strabismus (including micro-strabismus) in young children, and has also been proposed for diagnosing amblyopia by detecting strabismus and by detecting a reduced fixation accuracy.[5]

                              Limitations
                              However, also birefringent properties of the cornea and the retinal nerve fiber layer (RNFL) are sources of birefringence.[6] Corneal birefringence varies widely from one individual to another, as well as from one location to another for the same individual,[7] and can thus confound measurements.

                              http://grantome.com/grant/NIH/R01-EY012883-02

                              The fovea of the eye is surrounded by a distinctive pattern of birefrefringent fibers that change the polarization state of transmitted light.

                              https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4528539/

                              The fovea is the specialized, most sensitive region of the
                              retina that is aimed at the object of regard during fixation. It
                              is surrounded by a radial pattern of birefringent Henle fibers,
                              fibers that change the polarization state of light that passes
                              through them.

                              http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.818.1110&rep=rep1&type=pdf

                              We suggest that when Fresnel’s laws are applied to the unguided oblique rays, that the cylindrical geometry of the blue cones in the fovea along with their distribution induces an extrinsic dichroism and could explain why the human eye is sensitive to polarization.

                              We have also found that, surprisingly, the rotating pattern is more regular and symmetrical with one of our two eyes around a more circular blue cone-free area, the dominant eye. Our results suggest that the polarization sense can provide important information in many areas that remain to be explored.

                              The short-wavelength sensitive blue cones seem to play a crucial role. We will perform most of our in vivo tests with only blue light, leading to contrasted blue-dark brushes appearing in place of the blue–yellow brushes observed in the presence of white light, as confirmed later by our model.

                              https://www.sciencedirect.com/science/article/pii/S0042698910003433

                              There seems to exist a triangulation between Blue light-polarization-strabismus (Convergence)

                              So I got my first polarisation filter today. Linear polariser camera lens and have been playing around with it.

                              I have found that all the smartphones I have which use glass screens are linear. Those which use plastic screens are elliptically polarised. The application of a cheap plastic screen protector on a glass screen produces elliptical polarisation.

                              Been buying tools for phone surgery, so hopefully in a few days/weeks I might be able to remove the polarisation layer from an OLED phone and see if I find it more tolerable.

                                tfouto

                                If it dims but does not blacken whilst rotating a linear filter, its elliptical. Its difficult to explain why without giving a trig lesson.

                                Linear polarised light is light which only oscillates on one axis.

                                Circular polarised light oscillates on two axes 90degrees apart.

                                If you plot that on an X-Y graph over time it draws a circle.

                                Now if one of the two waves comprising circular polarised light is bigger than the other it won't draw a circle, it will instead draw an ellipse. Producing true circular polarised light is actually quite tricky because the separated waves have to be at the exact same magnitude.

                                Bringing this back to using a linear polarising filter to detect elliptical polarisation. At some angle it will block the smaller wave, 90degrees later it will block the larger wave but let the smaller one through. So as you rotate the filter it will dim a bit but never blacken for elliptical polarisation as one the waves is always passing through.

                                    Seagull It also depends on the filter itself. With some sunglasses it almost dim everything, with other dim less. So it depends on the filter itself, the strenght of filter.

                                    Where did you bought your polarisation filter?

                                        tfouto

                                        I bought camera filter lenses from ebay. Both a linear and circular filter, though I only have the linear at the moment.

                                        Using my LCD computer monitor as a reference, it doesn't quite block all the light, instead reducing the transmitted to a very dark blue

                                          2 years later

                                          Did polarisation work for anyone? If so, how? I notice iPhone 8 and polarised sunglasses are way better than without

                                          When I wear polarised Raybans, or even non polarised and used iPhone, it's certainly better

                                            a year later

                                            Hi! To bring some new info to this thread, there's a post below from russian-speaking hardware forum ixbt.com
                                            It is google translated so sorry for readability.
                                            This guy wrote a post about specific monitor model.

                                            There is a clever way of sharpening, patent WO1996007115A1 - Improved polarizer (improved polarizer). The polarizer consists of many small waveguide cones. Which allows you to improve viewing angles, contrast and sharpness!. The light from the monitor is not solid (scattered, as in real life), but thin rays (10-40% of the size of the subpixel). The brain is not able to distinguish these rays, but the eyes catch, which leads to their tension. Such cone polarizers in various configurations are now commonly used. I changed the polarizer from "improved" to normal - the eyes get tired much less. Without sharpening, the text looks unusual, you need to look a little closer, but the text itself looks like in a book, without unnatural clarity. But with an improved polarizer I can read from a meter, I see everything, although I shouldn't, it's too far and shallow. The eyes have to pay for such clarity. Oddly enough, in some people, their eyes react to increased clarity the other way around. I showed 2 monitors to my friend, the first one with a very sharp polarizer, the second one with a moderate one, so he said that the first one had a normal text washed in the second one. The Ya. Market is full of reviews about fuzzy text, I think that's why. In monitors where there is no sharpness adjustment in the menu, it remains intact. And the differences in clarity are due to different polarizers. Patent citations:
                                            The present invention is advantageous to use because viewability around the normal to the plane of the liquid crystal device is improved and when viewed at high angle, the quality of the image is improved in that it exhibits better contrast and sharpness
                                            One advantage of placing the polarizer element and the array of tapered waveguides in close proximity is that the distance between the liquid crystal display device elements (pixels) and the array of tapered waveguides is minimized which results in an image with greater sharpness, contrast, and color purity

                                            Quad43 yep me too, slightly better.
                                            Everything that have a capacity to scatter the light slightly helps. Like tpu screen protector, mentioned somewhere on this forum.

                                              This is extremely intriguing. I haven’t tried any form of polarized overlays or glasses with panels. I will be keeping an eye on this.

                                                dev