Nowadays, people only pay attention to PWM strobe, but ignore the lower frequency FRC (Temporal Dithering) strobe
by Poster
May 15, 2025
36
Most of Apple's devices, including mbp and ipad screen panels, seem to be 8-shake 10, especially about m-series chips will be dithered by the GPU to achieve 10-bit through time domain (please Baidu Temporal Dithering), even if your external screen can only Receive 8bit signals, it can also display 10bit color depth through this, but this will produce low-frequency flicker and cannot be turned off (even if it is adjusted to sRGB color gamut, it will flash).
There are many related discussions on the LedStrain forum. Netizen aiaf realized the feature of turning off by reverse engineering to write registers, and wrote one-click switching software Stillcolor. He used video capture card and differential to show us this stroboscopic:
https://www.youtube.com/watch? v = D9AZqJH-U-U
Post details see:
https://ledstrain.org/d/2686-i-disabled-dithering-on-apple-silicon-introducing-stillcolor-macos-m1m2m3
Some "sensitive skin" netizens also think that there is a problem of screen lottery, and screens with serial numbers from different manufacturers have different pressure on eyes:
https://ledstrain.org/d/3131-2014-m3-all-macbooks-full-chart-by-model-display-code-raw-serial
https://ledstrain.org/d/3069-m4-mbp-quantum-dot
Replies
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Poster May 15, 2025I also summed it up after reading the post. There may be fallacies. Please use ioreg-lw0 grep-i raw-panel-serial-number to look at your screen manufacturer. Try the Stillcolor software and report what you observed on the built-in screen and the external screen. Phenomenon? In addition, now BetterDisplay has also introduced the feature of turning off time domain jitter: https://github.com/waydabber/BetterDisplay/wiki/Eye-care:-prevent-PWM-and-or-temporal-dithering # help-with-temporal-dithering
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Poster May 15, 2025Of course, in addition to software GPU jitter, the display panel may also have its own hardware time domain jitter, but this is very difficult to measure in general ways-because before the video capture card step, the display panel of the same brand and model may also be manufactured by different manufacturers., this information is opaque and difficult to check
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Poster May 15, 2025This phenomenon is particularly obvious on the electronic ink display screen. Anyone who has used electronic paper books knows what the ink screen looks like when it refreshes the content, and the macbook will observe crazy flashing when it is connected externally. 🍑 Baosou DASUNG Paperlike ink screen states on the product page that it cannot be used normally due to this jitter and does not support Apple devices
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Poster May 15, 2025There are videos recording macro in notebookcheck's review: https://www.notebookcheck.net/Apple-MacBook-Pro-14-2024-review-The-M4-Pro-and-matte-display-are-massive-upgrades.914597.0.html In the Screen Flickering section: https://youtu.be/SPOs30iijpg
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Anonymous613 May 15, 2025Get the screen clear, 👍
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Anonymous2241 May 15, 2025Ask a more mentally retarded question. Why does this stroboscopic stress on the eyes?
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Anonymous8228 May 15, 2025@ Poster The electronic ink screen (aragonite) I used supports apple chip external display, which only shows that big technology is not good
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Anonymous94 May 15, 2025@ Anonymous2241 miniLed also constantly controls the brightness and darkness by turning on and off the mini lamp beads. The low-frequency flashes of brightness and darkness are captured by the eyes. Your pupils have to follow the normal person. Just shine a flashlight on your eyes with the doctor to check that the pupils will shrink. The pupils of the dying person will dilate
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Poster May 15, 2025@ Anonymous2241 This kind of stroboscopic flicker is visible to the naked eye at tens of Hz. Netizens with sensitive skin on the LedStrain forum all say that their eyes will be tired after using it for a while. Everyone's physique is different
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Anonymous2178 May 15, 2025You said I've known about this shake before. I also looked for software to turn off frc, but it failed. It is almost impossible to have a native frc-free panel, and having this kind of panel is also more biased towards color professionalism. Color professionalism and eye-friendliness are different technical directions. I rarely mention this. Some people say that on m series Macs, different system versions of the same model have different frcs.........
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Anonymous2178 May 15, 2025Your post is very good, and my understanding of frc is a little more complete. Especially these two softwares, this kind of niche software is particularly hard to find. I found the software that turns off mac frc for a fee before. I looked around and only found that one, and it hasn't been updated for a long time, and I don't know if it can be used., it stagnated.
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Anonymous2242 May 15, 2025Is the Mac mini also 8-shake 10 when using an HDMI 2.1 external monitor?
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Anonymous2243 May 15, 2025It seems to be a little more comfortable after downfall
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Anonymous2244 May 15, 2025BetterDisplay software has a GPU Dithering option, which can also be cancelled
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Anonymous2178 May 15, 2025But as I said before, anything in the form of backlight is not eye-friendly. Nowadays, there are many technologies in color, whether in panels or light sources. But none of them are eye-friendly, and color performance is the first technical direction of display technology. In fact: turning off frc, choosing dc instead of pwm and it is global dc, choosing circular polarization instead of linear polarization, choosing hardware low blue light, tuv eye protection certification, etc. are all methods of constant compromise, and these will not have any clear scientific basis in a short time. Supported by the basis, today's science is full of a large number of mutually exclusive views. More depending on the voice and change of a few people, those who watch the monitor for a long time will be sensitive to these subtle damages to the eyes, and science is also done by people. There is a very simple way to avoid the damage to the eyes caused by modern ever-changing display technology, that is, direct light for reflection. This kind of display panel has high requirements, but as long as there is high-quality warm and cool front light/reflected light, there is no need to pay attention to display technology, which wastes energy in vain. However, it is also the law of natural development to pay attention to display technology and constantly spend energy on direct light sources.
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Anonymous2245 May 15, 2025@ Poster The panel 8 shake 10 is completely controllable by the monitor itself. This DASUNG Paperlike cannot be used because its own technology is not good.
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Anonymous2246 May 15, 2025@ Anonymous2178 The CCFL liquid crystal monitor more than ten years ago was reflective, right? However, the life span was too poor and it was eliminated
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Anonymous2247 May 15, 2025Anyway, I insist on ccfl unwavering It's none of my business Fluorescent tube shields all strobe
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Anonymous8184 May 15, 2025Don't bother to research, which screens are problematic?
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Anonymous480 May 15, 2025@ Poster Hello, does BetterDisplay's GPU Dithering button blue or grey mean that time domain jitter is turned off?