DisplaysShouldNotBeTVs

Edit: Nevermind, I think this is just circular polarization. See this post where Seagull mentioning using tracing paper to help with polarization effects.

https://ledstrain.org/d/2315-vertical-and-horizontal-polarization-as-eye-strain-trigger/4


Have you tested your screens by looking through polarized sunglasses? On my MBP TB, I can never get the screen to go fully black by rotating the sunglasses to a certain angle like 90 degrees like with the 7i and other displays.

Instead I get a blue-purple image here:
https://ibb.co/cQ5Yg5v

Right side is looking through the sunglasses rotated at 90 degrees which is the maximum I could get to dim the screen. So it looks like only certain wavelengths are polarized?

simplex

Interesting. Unfortunately, I've haven't played around with CRU yet. Perhaps you were adapted to the default refresh rate and other parameters. Would be interesting to systematically test each variable through EDID settings but I'm still very new to tinkering with EDID.

    photon78s Perhaps you were adapted to the default refresh rate

    I can use another 165hz monitor without issues…

    I change refresh rate in safe w10 1809 setup to "not registered" and got same noise (which gives me eye-strain) as in video with "bad" win versions I tested

    Have a look -> https://filetransfer.io/data-package/iwnh2gOL

    Only EDID reload (I think from monitor's eeprom) made reset to "default lazy flickering"

    Can OS flickering be due to bad EDID interpretation? I can find thread there where guy desrcribe same feeling as mine when set non original framerate, but when I install all win versions above 1809, I get chaotic pixel movement equal I got setting non original framerate in "safe win version"

      simplex

      I did have to factory reset my LG monitor after tinkering with a HDMI EDID emulator device to restore UHD resolution support. The monitor and the OS remembers the setting from the emulator (recognized in Sound settings as well as THWT 1080P).

        I've read users observing thin white lines in between pixels on certain displays. I don't notice them on my 7i or MBP but I remember seeing them on an older model Ryzen Legion laptop (don't know the laptop model panel unit). This reviewer calls it a "rastering effect".

        https://www.reddit.com/r/thinkpad/comments/qxxtoq/thinkpad_x13_gen_2_amd_initial_initial/

        There is a display lottery, and I lost it. Mine has the InfoVision M133NW4J R3, and it’s really bad. Out of the box, it has a warm/reddish cast, though a calibrated color profile may help. It also has a weird rastering effect, where you can see faint lines between the rows of pixels when you get moderately close to the panel. Looking at it with a 20x loupe, it seems that the space between rows of pixels is slightly further apart than between columns.

        photon78s I did have to factory reset my LG monito

        you did factory reset of monitor settings (physically), or reload EDID ( reset-all.exe ) from monitor's eeprom using CRU software….?

          So I was interested in how light polarization might affect eyestrain and I tried some tracing paper in front my LG display. Looking through my polarized sunglasses I see no darkening effect however which why I orient the glasses. This means no more polarized light. The visibility is not too good for fine detailed work but passable only if you can get the paper fully pressed against the screen.

          https://ledstrain.org/d/1421-tracing-paper

          I found this research on smartphone light polarization (circular versus linear) on eye symptoms. Not sure about the conclusions of that paper but relevant to some observations on this forum. For myself, it seems that I'm not too sensitive (humans are supposed to be not sensitive at all to polarization?) to either type of polarization. Some iPhones are circularly polarized and so is my M2 MacBook Pro Touch Bar laptop.

          Comparison of the influence of light between circularly polarized and linearly polarized smartphones on dry eye symptoms and asthenopia

          https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9010255/

          2 months later

          PSA Update!

          My LG 27gp95r-b is showing fainting horizontal banding across the entire width of the screen. Still too early to say if this causes increased eyestrain as I have to be very close to the screen to see it so it went undetected during my several months of ownership so far. This is an ips UHD rez 144hz monitor with 8 bit + FRC dithering. Hopefully this is not a widespread QC issue.

            photon78s Hopefully this is not a widespread QC issue.

            you remember my video with vertical green bars all across the screen? you can check it in your problematic screens

              As some of you are considering trying older lenovo windows/linux laptops, I going to start a list here of potential replacement display panels for ThinkPad T480 and/or T480s that may work for some eyestrain wise.

              1. https://www.panelook.com/LM140LF1F02_Panda_14.0_LCM_overview_48911.html (144hz refresh rate for a thinkpad!)
              2. https://www.panelook.com/N140HCG-GQ2_Innolux_14.0_LCM_overview_41388.html (This is a low power IGZO FHD display for better battery life, IGZO means indium gallium zinc oxide as semiconductor material)
              3. https://www.panelook.com/R140NWF5_R6_IVO_14.0_LCM_overview_36125.html (matte FHD touch screen, 6 bit color so not recommended for dithering reduction)
              4. https://www.panelook.com/B140QAN02.0_AUO_14.0_LCM_overview_37246.html (hdr wqhd glossy)
              5. https://www.panelook.com/B140QAN02.3_AUO_14.0_LCM_overview_33893.html (Non-hdr wqhd matte, what I am using in T480s)
              6. https://www.panelook.com/LP140QH2-SPB1_LG%20Display_14.0_LCM_overview_40282.html (I prefer number 5 to this which came with my T480s)
              7. https://www.panelook.com/N140HCA-EAB_Innolux_14.0_LCM_parameter_30063.html (has PWM)

              How to guide:

              https://forum.thinkpads.com/viewtopic.php?t=127439

              https://www.ristrettorambles.com/upgrading-settling-into-the-thinkpad-t480/

              https://www.ifixit.com/Device/Lenovo_ThinkPad_T480

              https://www.ifixit.com/Device/Lenovo_ThinkPad_T480s

              One thing to note is whether your machine comes with 40 pin or 30 pin cable and the eDP version and number of lanes. You may also have to use a pinout converter with one compatible with your chosen panel. When I replaced the panel on the T480s, the cable length was a just barely enough to reach the location of the slot on the panel. Another aspect to check is if you are using narrow or regular pitch pins. If you get a T480 the comes with a FHD touch display, it will greatly limit your options as to what panels can be swapped out without tinkering with eDP pinout adapters and motherboard to panel cables.

              Resources for understanding pinouts and cables:

              https://hackaday.io/project/179868-all-about-laptop-display-reuse/log/209701-common-edp-laptop-panel-pinouts

              https://www.reddit.com/r/thinkpad/comments/uw0tit/t480s_from_fhd_touch_to_non/

              https://old.reddit.com/r/thinkpad/comments/up3bql/seeking_advice_for_p14s_screen/

              https://www.reddit.com/r/thinkpad/comments/i9oqr1/comment/g4fm42k/?rdt=45559 (see 30-pin normal eDP cable FRU 01YR501)

              https://www.reddit.com/r/thinkpad/comments/v8tf2n/t480_screen_buying_advice_in_eu/?rdt=53836

              Pin Pitch Converter Example

                photon78s notice the lines in the lighter parts in the trees

                I see, can you record a video with NR/shrapenss settings to lowest values?

                The image you posted could be a camera's sharpness algorythm, or you can see this lines ( or squares ) in reality …..?

                  simplex

                  Nothing is different on video as it is static and not flickering. Yes, it is even easier to see with naked eye. This is third time I've seen this. First on a legion 5 amd laptop, the NEC EA271U-BK monitor, and now this LG gaming monitor.

                    photon78s LG gaming monitor

                    which LG monitor…?

                    Thats very strange. Some kind of "crystal cell" effect, where you can see subpixels border…

                      simplex

                      The one I have listed in my original post for this discussion in the table: LG 27gp95r-b

                      I still need to find the specific panel model. It was not present or maybe as noticeable when brand new out of the box only a few months ago.

                      Edit update:

                      The horizontal lines are what's shown in these videos expect mine is less noticeable.

                      https://www.youtube.com/watch?v=2agVKO-Ihkk

                      https://www.youtube.com/watch?v=1FcM1cb34Uc

                        10 days later

                        photon78s The horizontal lines are what's shown in these videos expect mine is less noticeable.

                        can it be kind of LG's vcom ?

                          simplex
                          I have no idea. Need to find their datasheet.

                          PWM waveform at 0% and 100% brightness using thorlabs pda100a2 detector. 20dB gain setting on photodetector produces this waveform. Close to flat at 0dB gain setting.

                            photon78s 20dB gain setting on photodetector produces this waveform

                            Gain gives more accurate result… Same smooth results you can get placing photodiode at 5 or 10 cm instead of directly on the screen

                            dev