• Edited

Does anyone here have a spectrometer or spectrophotometer to test out what color gamut modern LCD smartphones employ nowadays? In particular, in form of a spectral power distribution graph.
I'm curious whether the anecdotes of KSF/PFS & QD backlight causing eyestrain from desktop displays transfer over to LCD smartphones.

https://www.anandtech.com/show/10217/the-lg-g5-review/4
From this article, it seems that the LG G3 was the last LG phone with a old YAG phosphor W-LED backlight.
KSF/PFS panels became mainstream from 2014 onwards, I assume most LCD panels are WCG (wide color gamut) nowadays.

I think this might be a far bigger culprit than the witchhunting for dithering (FRC) implementations.

    qb74 I definitely think the phosphors are part of it. I think the light emitted is far from natural and that the colors are way to intense. Most devices are using pfs/ksf if they can display wide color gamut.

    LCD 7i pro laptop

    Asus gl702vm LCD laptop

    Daylight dc1 tablet rlcd / tlcd

    13t xiaomi amoled

    Dell up2715k LCD which is the same panel as the older 5k iMac. I believe this panel uses the gb-r led backlight

      • Edited

      jordan
      This is great, interesting to see the SPD of a AMOLED display, thank you for sharing.
      It reminds me of the graph of QD-OLED desktop displays.
      I'd love to see a few smartphone SPD's collected in a spreadsheet, so we can start recommending different technologies to different potential eye strain concerns.

      Other ones I could find:
      https://www.anandtech.com/show/11269/display-report-huawei-p10-and-p10-plus
      https://www.anandtech.com/show/10871/the-huawei-mate-9-review/4
      https://www.anandtech.com/show/10217/the-lg-g5-review/4
      https://laptopmedia.com/analysis/samsung-galaxy-s6-review-a-bunch-of-innovations-in-a-beautiful-body/#p4 (can judge based on AdobeRGB coverage)
      https://laptopmedia.com/review/samsung-galaxy-tab-s7-review-120hz-ips-display-paired-with-the-extremely-capable-snapdragon-865/#p4
      https://laptopmedia.com/analysis/samsung-galaxy-s6-edge-review-is-this-the-most-innovative-smartphone-in-the-world/#p3

      Collecting this data, along with measuring G2G response times would be great for troubleshooting eye strain concerns.

      6 days later

      JTL FWIW, I've found the posts from @Vividblu99 (and some others) to be very helpful. He generally lists the phones that he's tried and how well they've worked for him.

      If we did start a new thread, maybe we could enforce a format something like:

      • iphone SE: gave me headaches within 30 seconds of using it.
      • iphone 15: usable for 10 minutes
      • ...

      This wouldn't be perfect. For instance, the same model doesn't always have identical hardware or software. And what works for one person might not work for another. But I think I would find it much more useful than the last year's worth of the current thread.

      jordan

      What is this tool you are using? Have you found it helpful to find useable devices?

        ocean10 This is the Mk350n premium by uprtek. Its helpful to test devices/bulbs for flicker and color spectrum but so far all devices just seem so bad for me. I actually have to view the meters screen through a phones camera because the lcd on it bugs my brain.

          jordan I actually have to view the meters screen through a phones camera because the lcd on it bugs my brain.

          I have to do the same thing when I need to do something on my son's phone. It's a pretty useful trick.

            GregAtkinson it sure is! thats how I have to look at my moms phone if she shows me something. lol (iphone se 2020)

            after years of trying devices without luck i got a honor 70 lite (as recommended by forum members) and it worked for me ,i recommend this phone for very sensitive people because it has no pwm and no dithering , the screen is a basic tft panel

            I just got the new Bigme Hibreak Pro and it's a major step forward for e-ink phones:

            https://store.bigme.vip/pages/hibreak-pro-landing-page?srsltid=AfmBOoody8_4Mhc_vfqyOhbv173dxDyuJkIQCOPC6WgK5wxY-9VRc4sS

            I mainly use mine as a pocket reader and web device, but it reduces my iPhone screen time to almost zero.

            I reviewed it here: https://www.reddit.com/r/ereader/comments/1j2tavy/bigme_hibreak_pro_pocket_reader_review/

              Rowe

              No temporal dithering? All the mediatek devices I've used have all dithered.

              I don't know, but when I've used devices with temporal dithering (e.g. macbooks) on e-ink screens the results have been very poor. Until it's switched off.

              The optimisation on the Hibreak Pro is excellent, so I doubt this is an issue. They claim it is 'zero flicker'.

              Rowe I keep an eye on this device. I just have concerns about data security.

              • Rowe replied to this.

                Clokwork Considering the device is Play Protect certified, what additional security concerns would there be if only using Play Store apps?

                I’m not an expert on this, but I’ve seen comments suggesting that with Play certification, the CCP security risk is lower than that of the routers and networks the device connects through.

                  Security is good, but be realistic too.. The Chinese don't care about nobodies like us. Americans however, would add all of us to their databases.

                    Rowe If its running 100% pure Android, I suppose it could be ok. If there is any modification whatsoever to it, its possible to have any amounts of data be sent home.

                    Sunspark I can't say I agree with this 100%. We are cattle to any company, country, entity that can profit from our information.

                    But online comments warning of the security perils of fully Chinese devices are much more common, compared to all the other devices that are still assembled in China but fronted by Western companies. I also don't think CCP care about any of the data that would be on my device. But American companies want to mine that data much more. To be honest I don't really care about that much either outside of authentication and transactions.

                    Still on e-ink. Using a Hisense A9 these days. Faster than the older Hisense e-ink models and XDA got way more involved so it can run a range of systems rather than just root and add GApps.

                    Pity the next model with Kaleido 3 colour never came out.

                    I don't find using B/W that much of an issue, but would like a good small screen that doesn't trigger me too much to cast to for colour when I need it. Tried one that was meant to be flicker free, etc. and sent it back very quickly.

                    dev