logixoul It depends on the frequency of PWM. Low frequency like 240Hz is easily detected by just the image, as there will be one or more black bands in the image. If it is very high frequency and the time the pixels are off, it is difficult to detect as in a 4k screen there would be just one thin line that is "off".

But yes, best way is to take a 1/4000 shutter speed video on manual settings and actually watch the video on a big screen. I was able to detect my Ring Light flicker that way. It has a PWM in the Khz range and in the video I'm able to see slight banding, which I was not able to see in the DSLR screen.

And of course, the Ring Light produces eye strain if I use it for video calls for say 1-2 hours a day. Just noticed it a year or so ago, when I got it and was wondering why my eyes were strained after using it.

Frustrating that they put PWM into everything and claim it is problem free if the flicker is in the Khz range, because it just is producing eye strain.

My theory is that as the light is ON in full power even for a fraction of a second, the optic nerve recognizes this high power light and the pupils will try to constrict like they would when watching a bright light. After an hour or so, when the pupils are trying to accommodate the bright light by fully constricting, the eyes get strained and red.

    My experience on the DSLR PWM testing goes back over 10 years and with at least 50 different screen.

    When ever notebookcheck, laptopmedia or TFTCentral reports a PWM, even in the Khz range, I'm able to detect it easily with a DSLR. With the more recent Notebookcheck PWM tests, if they say there is no PWM, I'm not able to detect it with a DSLR either. It has been fairly convenient way also to take a DSLR to the computer or TV shop and test the screens on-site, before buying.

    But all this has of course failed over the past few years as most new laptops do not have PWM or do not have it in the high brightness levels, but still produce similar eye strain as PWM, though not as bad as a 240Hz Oled PWM.

    Nobody seems to know what is it that they do with the modern screens that produces the same symptoms as PWM, though there is NO PWM. This is really a mystery and I wonder why nobody is able to answer this from the manufacturer side. I've tried to ask this question many times. And like many of us remember there was the Intel forum thread where this was discussed but the Intel engineers denied there was anything they do with the display adapters or drivers that could affect this. I am biased to think this is true, because I can connect an offending laptop to a good screen and use it without problems. But a bad screen does not become good with Linox or older windows version. So I tend to think there is something that is done at the panel level, which all manufactures adopted some 5+ years ago

    17 days later

    zsdd89

    Can you tell me what version android you have on the OnePlus 8T? I read that they got rid of the dc dimming in android 12.

        John615

        I'm using LineageOS 18.1 (based on 11), much better than stock. LOS has DC dimming toggleable in tiles but i have turned it on nonstop. A12 based LOS 19 is coming in next few weeks

        On Oxygenos 11 you could turn it on throug ADB commands but on OOS12 everything is different (fuc**d up). But fortunately this is an officially supported model by LOS so it can last much much longer than with stock os 🙂

          degen I'm sending the G100 back. It was good but not perfect and a little on the bulky side. Didn't upgrade to Android 12 because i unlocked the bootloader and tested a bunch of custom roms on it. Didn't make a difference. Be aware that if you unlock the bootloader you can't lock it back and reclaim warranty. I bricked mine and some dude from XDA helped me restore it back to stock. Currently testing the Oneplus 8T with dc dimming enabled on LOS 18.1 which seems a little better but i'll have to use it for a couple of more days and with different apps before i reach a conclusion.

              degen Might be a little too bright during night time. Try the extra dim and night light features in display settings that Android 12 has.

                  Staycalmsyndrome I might try OnePlus 9 with LOS. (OnePlus 8T is sold out in Canada). OnePlus 3 had software-induced strain starting with Android 8 so I am glad that perhaps newer OnePlus has improved. I realize you are still testing though.

                      It looks like it is hope, for new modern phone with no PWM:

                      Xiaomi Redmi Note 11T pro plus

                      https://www.notebookcheck.net/Xiaomi-Re ... 174.0.html

                      It could be outside China, rebranded and sold in some of the variant of Poco phone:

                      Poco X4 GT

                      Poco X4 GT+

                      https://www.google.com/amp/s/m.gsmarena ... -54342.php

                      But of course, that possibly good information should be verified, when someone will have that phone in the hands for tests.

                        degen It was Android 11. I personally don't find myself affected by any software or driver version. My current eyestrain with all displays is an example. Not all the displays received a software update at the same time in February (several TV's, Tab, smartphones, windows computers)

                          tustac90 And I have had a few non-PWM displays that still caused eye strain, like Huawei Mate Pro 9 or 10 and Xiaomi 10t Pro.

                              Staycalmsyndrome Are you absolutely sure that you used it with the brightness above 65% and that you did not have too fast screen off time, where it dims the screen and enables the PWM? I found with some phone that the screen dimmed after 30 sec or so and I ended up looking at PWM flickering several times a day.

                                  Maxx

                                  Mi 10T pro, even it had IPS screen, had PWM of 2381 Hz when dimmed below certain brightness value.

                                  https://www.notebookcheck.net/Xiaomi-Mi-10T-smartphone-review-Flagship-power-for-little-money.507541.0.html

                                  Not all IPS screen all PWM free. Even if they are,
                                  according to many users there also could be other phenomena like color dithering, etc. that cause eye strain.

                                  But it is worth try that upcoming:

                                  Xiaomi Redmi Note 11T pro plus
                                  Poco X4 GT
                                  Poco X4 GT+

                                  Because there all be with new components, decent cpu power, probably usable main camera, fresh battery, and few years of android OS updates.

                                  We will see upgraded LTPS IPS LCD screen, that looking into the specification will be PWM free. Maybe it will be dithering free?

                                  And advertisement claims that someone at Xiaomi spend some time, about resolving the PWM problem. They will build advertisement strategy about that topic. We will know when phone will be released.

                                  Of course, someone should check that screen is usable. Made some tests with oscilloscope. Use it for some time...

                                  It is also worth mentioning that OnePlus also should release phone with LCD screen.

                                  OnePlus Ace Racing Edition.

                                  https://www.xda-developers.com/oneplus-ace-race-edition-launch-date-specs/amp/

                                  But it is still unknown if it will be released globally, or the phone will have PWM...

                                    Maxx The screen was pretty usable but i am also sensitive to radio waves. Some chinese phones give of pretty bad vibes even when they are turned off or disconnected from battery.

                                      Are there different models of the g100? Some listing say it has 5g and others don't. Looking to buy one to use with Verizon in USA. Just want to make sure there are no screen differences if there are different versions of the phone.

                                      • bz12 replied to this.

                                        bz12

                                        I've read a few posts of people using the g100 with verizon. One person on lenovo forum and another on reddit. I read the whole CDMA and gsm issue is no longer relevant in newer phones?

                                        • bz12 replied to this.

                                            John615 it may only have a couple Verizon bands which could result in poor service. Haven’t researched enough on the exact phone, but going by Motorola’s website it says incompatible with Verizon. I’m on Verizon atm as well. Thinking of switching back to ATT because it seems there’s more compatible devices.

                                              dev