Lauda89 The last Iphone I had was XR. The phone doesn't flicker at all. Did not include it for a long time. Iphone X is not mine. It's a friend's phone. He only sent me pictures. I don't know about the screen. Given that the phone is seven years old (screen may not be original). Modulation depth 99.5% indicates measurement error (outside the sensor flicker range). PWM 99.5% is only possible on Samsung phones. These "demons" like to make a person suffer.

    People say that the Xiaomi POCO F5 doesn't hurt your eyes. Because it has a 1920Hz screen. How can you prove it? Let's check POCO F5 (Amoled) for flicker | Set the brightness to 100%

    DC Dimming is on. What already? And I don't feel any flickering. Set the brightness to 75%

    Xiaomi deceives the brain with flickering (in multiples of 60). Set the brightness to 50%

    Do not pay attention to Modulation depth. The screen is very pleasant. Just flickering is outside the Light Master measurement range. A little fatigue appears an hour later.

    Thanks for this, this post is very useful!

    You are using the opple 3 or the 4? You have realme phones to test? i cant find an opple lm here where i live, i am curious to see what results could have the realme narzo 30 5g (wich i am using now without problems) or the realme 9 pro (wich almost everyone here likes with few exceptions)

    sorry bad english.

      nikomanuel96 You don't need a Light Master to see the pulsation. It is enough to have a second phone. Just take a photo of the screen (with an shutter speed of 1/8000). Let's find "eye-safe brightness" on the OnePlus 9R (Amoled) | pictures taken by Ilemar, thank you.

      Flickering on the screen are stripes. The more stripes, the more flickering. When the IPS screen looks clean.

      As you can see, up to 50% of the brightness "the eyes do not hurt." PWM 20% for 120Hz screen is normal.

      When the brightness drops to 30%, red tears will come from the eyes. It's time for DC Dimming to turn on

      You can compare two photos. The eye strain has halved. When turning on 60Hz, it is safer four times.

      The PWM limit is 30%. At brightness zero "eye protection". Why is DC Dimming disabled by default?

        Why do your eyes hurt more at 144Hz than at 60Hz? Using the Motorola Edge 30 Pro (OLED) as an example. Let's look at the graph of the curve.

        As you can see, at 144Hz the screen flickers more often. This means that the modulation depth (PWM) at 144Hz is higher. And the eyes will also get twice as tired (at the same brightness).

        Every YouTube blogger says that TCL NXTPAPER are safe for the eyes. TCL NXTPAPER even received TUV Rheinland 3.0 certification.. And at the same time, at brightness below 50% TCL NXTPAPER begins to flicker. There are already negative reviews on TCL 40 NXTPAPER 4G and 5G. There is no such information about tablets. Let's check TCL NXTPAPER 12 Pro (IPS) for screen flicker. Set the brightness to 10%

        The backlight has been proven to flicker. Light Master sees flickering, but can't find Modulation depth (PWM) right. With viewing angles, the screen has big problems. Already at 45 degrees the screen turns blue. All colors don't seem natural. "Low Blue Light" mode must be turned off. (full pic 1,5mb)

        Lauda89 Are you sure that the panel is original?

        Here's a photo after replacing the screen for the iPhone 12. The owner bought screen at Aliexpress. After being replaced with IPS (from China), his eyes stopped hurting.

        Do not look at the Modulation depth reading (the value is not correct). Most likely, Light Master just shows "eye protection" at a high screen refresh rate. The curve graph of the original IPhone X and 12 screen must be the same. Only an oscilloscope can see in more detail.

        You can compare it with the original screen from IPhone 11 (IPS). The difference is just huge (in favor of the original).

          The v4 that you have can measure only light sources that opple makes, they said that not me. The meter can measure more then 10khz flicker dont kn why your sjows flickering sky.

          The sky does not flicker with the frequency of 9846Hz.

          Which SteamDeck (old or new) is better for the eye? Let's check Deck LCD. Set the brightness to 50%

          The screen is very pleasant for the eyes. After two hours, the eyes do not hurt. Recently released Deck OLED. There is a desire to buy. Let's check the Deck OLED for flicker. Set the brightness to 100%

          Valve seems to have forgotten to add DC Dimming mode. After turning on FullPWM mode, it did not get better.

          If you're still thinking which SteamDeck do you want to buy? Choose to opt for Deck LCD (my advice).

          If your OPPLE v4 can read up to 9846Hz. then you shoud return it for a refund. The engineer answered that question on the https://budgetlightforum.com/t/opple-light-master-4-discussion-thread-new-2023-model/217940/874

          "the minimum sampling time span for flicker is 11µs, according to Nyquist sampling theory, the maximal frequency is around 1000000 / 22, about 45K Hz."

          So the output should be 45K Hz , not 9846Hz.

          Besides OPPLE V4 is not sold anywhere except china, it's too much unstable to be sold in Europe. Don't know about US.

          The answer from programmer / engineer Steve is not promising on the future of opple v4.

          "idea from one of the employee of the Japanese’s firm verified, seems does not work.
          I don’t know why those coefficients are constants, is it applicable to a wide range of CCTs? I doubt it."

          "I think it is not we don’t care about other lights, it’s just we prioritize our lights first. we encountered problem as I said before, there is no smooth transition when one of the LM3 team member left us, and then I was not involved in LM development at all, so I have no knowledge of the transition process.
          then the magic number listed in below graph emerged when I started to proceed to this development stage, those magic numbers are for LM3 which used as7262, but for LM4 we use as7341 for those magic numbers need to be recalculated, and I have no idea of how those numbers are generated. How can I do, please tell me."

          Calling color constant "magic numbers", not knowing how colors are calculated.

          Old team no longer is working on v3 and not on v4.

          Upper management not understanding what product they are making for what market, they want to make it read their own light sources only. WFT? read about that in thread link i posted.

            Sunspark You are right to buy Deck OLED that flicker, a waste of money to the wind.

              smilem That does sound pretty crazy. Sounds like it was a small company that didn't document things and then they lost their subject matter expert.

                The LCD steam deck bothered me. I think it dithers ?

                Not all OLED screens are bad (as on SteamDeck). The eyes do not get tired of good OLED screens. Let's take the Lenovo Tab P11 Pro 2 Gen (OLED) as an example. Set the brightness to 10%

                For the 120Hz screen from PWM 55% of my eyes do not get tired. Most likely "eye safe" (as on the Poco F5). The frequency of DC Dimming / FullPWM is twice as high (than on Deck OLED). On Modulation depth 93% ignore, the frequency is too high for the Light Master. For those who do not like Mediatek, there is a model on SnapDragon 870 (they have the same screens).Helped RomanV82 with the review, thank you.

                Please pardon my ignorance. In this topic, it seems to be suggested that higher refresh rates on these phone displays cause more rapid flickering and therefore more strain. I had the impression that (at least with PWM) higher frequencies are less perceptible to the eyes and therefore less likely to cause strain. I have never heard of reducing framerate for better comfort, but indeed the opposite.

                Am I mixing up factors which are separate things?

                  macsforme Low-frequency PWM hurts the eyes, high-frequency PWM causes migraine. On monitors, hybrid (dual PWM), when the eyes and head hurt. Flicker Free certificate does not mean that pixels will not flicker due to dithering/cheap 6bit + FRC panel.

                    macsforme I had the impression that (at least with PWM) higher frequencies are less perceptible to the eyes and therefore less likely to cause strain.

                    Generally speaking, I believe your statement is correct. Faster is generally better. For most people, most of the time.

                      dev