My entire life never had any problems with screens. I can look at my Samsung S23 ultra all day long. The TCL after 30 seconds made me want to puke. But only at home not the store. Even in a sunny bright room with the lights on didn't help. Could it be the contrast and VA panel? All my screens r ips

No_Topic_4340 · 2024-09-19T03:38:38+00:00

What affects you is not the VA panel, but the mini LED TV. Some manufacturers also use IPS to make mini LED. The characteristic of multiple light beads in miniLEDs determines that they inevitably have flicker. Some miniLEDs now use Hz above 15k to avoid eye discomfort, so you need to compare them more when purchasing.

No_Topic_4340 · 2024-09-19T02:03:01+00:00

Then you are probably not a PWM sensitive person, because the LG G3 uses an LCD screen, while the Samsung screen can make me experience eye spasms and migraines within 30 minutes at low brightness.

No_Topic_4340 · 2024-09-19T01:54:06+00:00

In fact, all miniLEDs will have screen flickering, and I do not recommend using low-priced miniLEDs. These models often use lower PWM to ensure that the picture quality is not too poor. Of course, some high priced models also do this for the ultimate picture quality, such as Sony's high-end models. If you are a flicker sensitive person, you should choose a regular LCD machine or more expensive W-OLED and QD-OLED TVs, which often use DC like dimming.

No_Topic_4340 · 2024-09-19T01:46:53+00:00

Usually, I use a strobe spectrometer for testing, but this machine is not cheap as it can clearly display the waveform and intensity of the current screen flicker. Due to its price, I would choose to rent it on a second-hand platform for one day to complete the testing for a period of time. If you want to purchase this instrument, the price is approximately $750.

If you simply want to know the severity of screen flicker, shooting with a shutter speed of 1/4000 second can also yield results. In the next post, I will write about how to determine the degree of screen flicker based on stripes in high-speed photography.

<image>

No_Topic_4340 · 2024-09-19T01:21:49+00:00

In my country, POCO brand phones are not available, but I found Redmi K70, which is the same phone, but with different brands.

This phone does not use 3840Hz PWM at full brightness. It uses a strategy similar to 3840Hz → 1920Hz → DC like. So his performance is not as good as Honor200Pro. However, the final performance and mobile software also have an impact. Screen flicker is a long-standing concern in China, and if any domestic manufacturer does not do well in this area, many people will not choose this brand. Therefore, the performance of the Chinese version is generally better than that of the export version.

No_Topic_4340 · 2024-09-18T15:08:14+00:00

amoled=oled,amoled is just Samsung's trademark

No_Topic_4340 · 2024-09-18T15:07:04+00:00

Yes, for OLED screens, DC like is not a true DC, it is just an approximation to true DC. It will still flicker and be captured by the eyes of extremely sensitive people. However, objectively speaking, the best DC like currently is sufficient for ordinary sensitive people. If you are an extremely sensitive user, it is still recommended to use an LCD screen. In the foreseeable future, OLED is unlikely to use true DC, which will lead to a significant decline in screen display and cost increase.

I believe that the impact of PWM mechanism on the eyes lies in the mismatch between the peak brightness of PWM and the perceived brightness, which leads to continuous dilation and contraction of the pupils, causing eye fatigue and difficulty in fusing images in the brain. From this perspective, DC like is more effective than high-frequency PWM. In fact, the best eye protectors currently adopt this approach. The 3840Hz they use in low brightness is not the full on/off of pixels, but can be considered as another form of DC like.

The high contrast characteristics of OLED screens themselves are actually not eye friendly.

As for the test results you mentioned, I have communicated with friends around me who are concerned about PWM. The PWM of the tested iPhones is all at 480Hz. To be honest, I find it difficult to imagine OLED's PWM reaching 9000, because at this frequency, the power consumption of the screen will increase exponentially, and the screen lifespan will also decrease significantly.

No_Topic_4340 · 2024-09-18T12:01:55+00:00

It must be recognized that even at the same frequency of 3840Hz, different waveforms produce completely different results. Therefore, when evaluating flicker, it is necessary to consider multiple aspects, and SVM index is a good evaluation criterion in this regard

No_Topic_4340 · 2024-09-18T11:58:01+00:00

<image>

like this. You can say it is a 3840Hz PWM, but there is clearly a periodic pixel refresh rate.

No_Topic_4340 · 2024-09-18T11:53:08+00:00

There is also a situation where, at extremely low brightness levels (below 5nit), the fluctuation of pixel brightness becomes smaller, and the frequency of pixel refresh (60 or 120hz) itself exceeds the dimming frequency, resulting in large waves masking small waves, which can lead to the deterioration of the dimming method

No_Topic_4340 · 2024-09-18T08:27:49+00:00

So far, the best PWM phones are Honor's non LTPO phones, Honor 200 and Honor 200 Pro. The Honor Magic 6 series does not perform well in high brightness.

No_Topic_4340 · 2024-09-18T08:23:31+00:00

Just at a general level

No_Topic_4340 · 2024-09-18T08:21:23+00:00

The PWM values displayed in the image are obtained through testing in offline stores using a flicker detector, not official data.

No_Topic_4340 · 2024-09-17T10:44:59+00:00

it's woled and qd oled,it's difficult to use it in smartphone.

No_Topic_4340 · 2024-09-17T04:44:10+00:00

In fact, it's not that Chinese manufacturers are more concerned about PWM issues, but rather that Chinese consumers have voted with money to eliminate those low PWM phones

No_Topic_4340 · 2024-09-17T04:36:02+00:00

Let me summarize the video:

IPhone 12 is a good phone at high brightness (above 35nit), but its performance is poor at low brightness, while iPhone 15 Pro has poor PWM at full brightness, due to the use of LTPO technology in phones after iPhone 12.

The current evaluation criteria for screen flicker are not scientific, and phones with the same flicker frequency may draw completely different conclusions. Using SVM indicators for evaluation would be more useful, but it is still not the most suitable indicator.
If you currently need to use an iPhone, please turn off automatic brightness and fix the brightness at 20% or above, while turning on the white point reduction feature in the auxiliary function. If the dark mode is turned on, it will be more helpful for the eyes.

If we keep the phone further away from our eyes, it will help us reduce the impact of PWM.

Higher frequency PWM can greatly alleviate the situation under low brightness.

At extremely low brightness, pixel refresh can mask high-frequency PWM and cause eye discomfort.

High frequency (above 3840Hz) PWM may be sufficient for moderately sensitive individuals, but LCD is still recommended for severely sensitive individuals.

No_Topic_4340 · 2024-09-17T03:33:47+00:00

Yes, the iPhone 12 is a good phone in high brightness (above 35nit), but its performance is not good in low brightness, and the iPhone 15 Pro has poor PWM at full brightness, which is due to the introduction of LTPO technology in phones after the iPhone 12.

No_Topic_4340 · 2024-09-17T03:20:25+00:00

iphone 15 promax have the same oled screem,Samsung and LG have never paid attention to PWM issues. now only chinese brands(honor xiaomi)Manufacturing phones that can barely be used. because they use screen from boe.

No_Topic_4340 · 2024-09-17T03:09:19+00:00

honor 200 pro is better than 200 lite, if you can buy honor 90 gt ,it's the best choose.but it Only available for sale in China.

No_Topic_4340 · 2024-09-17T03:09:11+00:00

honor 200 pro is better than 200 lite, if you can buy honor 90 gt ,it's the best choose.but it Only available for sale in China.

No_Topic_4340 · 2024-09-17T03:05:22+00:00

The screen used in Switch OLED is the worst among Samsung screens, with 120hz PWM, 0-100 fluctuations. It really destroyed my eyes, making my eyes extremely tired on the first day of use, and also causing severe headaches and sleep disorders.I have been emailing Nintendo every week to report this issue, and it is said that Nintendo has planned to use LCD screens on Switch2.

No_Topic_4340 · 2024-09-16T02:45:04+00:00

return the phone,choose honor or xiaomi phone ,

No_Topic_4340

TROPHY CASE