Alright. After I bought the S20 Ultra, while using it, I felt pain in my eyes, migraines, dizziness and other problems that appear only if you look at the screen. I went online with this problem and found that the PWM ripple ratio very strong in the S20 line. The ripple coefficient is 40-50% at MAXIMUM brightness, which exceeds the safe ripple rate of artificial lighting set by different countries by 2-3 times. At a brightness of 60% or less, it is about 130-140% which are just huge values. At the moment, this is the worst result on the market. In a smartphone for 1000 euros. Such huge values combined with a large screen can cause the above problems not only for people who are sensitive to PWM, but even if you have never felt any problems with Amoled screens before (like me). In addition, due to this amount of pulsation at low frequencies, your pupils constantly narrow and expand slightly, which greatly strains the eye and can worsen your vision, especially if you are sensitive to PWM. Samsung needs to introduce a DC-Dimming function or its equivalent that reduces flickering and does not play with the health of their users.
I'm very disappointed in my new galaxy s20 plus.
this is the first time I've been disappointed since I bought 5 android smartphones before 3 of them are Galaxy S series.
My first disappointment is the top speaker. when In mid to max volume the body of the phone specially the back trembles and vibrates so hard that your finger feeling is getting electrocuted.
Second the s20 plus screen display uses the new dynamic amoled and it suffers from oled pwm which in slow motion you can see the blinking of the screen, which causes me headache and eye strain. in my s7 and s9, which is super amoled I never had an issue like this.
When I used it for over an hour my eye felt dizzy. it's more like motion sickness. my head hurts after using it and my eye strain so much, and even with the bluelight filter turned on it doesnt help, I don't know if it's the motion scrolling or what, but my eye really hurts after using the phone.
This is not samsung before, I love their brand I use, galaxy s3, s7, s9
this is the first time I get disappointed in samsung. and especially the EXYNOS version is way level poorer in performance than snapdragon which is only available in countries like korea,china,U.S
This is the very first time I wrote regarding a phone I bought, because I'm really disappointed, it's a $1000 phone not worth its price.
Hope you can fix everything I said in the next update. and hope you can improve your product more.
I have the note 20 ultra and will have to send it back as it makes me feel dizzy with eye strain. Such a shame as the phone is perfect otherwise. I will have to get another oneplus it seems. Such a shame as I do love samsung phones but it is unusable for me
If you go to https://ledstrain.org/ you will find 100's of people struggling with newer displays in phones and computers. Most have tried every option in the phone to help. Some even visiting specialist doctors only to be told there's no issues with their eyes. They are all stuck using 5-10 year old devices that give them no eye issue. Something in newer devices is causing this. The forum has a lot of information, even going into technical depth about the new screen tech.
I had 100 % exatly! the same problem with "Samsung galaxy s10" last year:
Problem summarized in 3-4 lines:
Eyes and headaches after 10-15 minutes of telephone use.
** The problem is 100% -- solved -- after I have returned the Samsung galaxy s10 and bought a new smartphone with "Zero PWM" according to the notebook check (se link down).
Result: No more agents or headaches! My PRoblem was definitely and 1000 % due to the bad PWM of the Samsung OLED display.
No OLED or Amoled Display anymore... and until samsung and the other manufacturers wake up to the problem, the world looks different..
My problem is documented by samsung:
I cannot use any OLED iphone since the launch of the X and Samsung supply the displays. Looking at an OLED phone with PWM and I can feel the muscles in my eyes start to ache which results in a migraine. The new iphone 12 models all make my eyes water and give me a multiple day headache. I've been unable to upgrade to any flagship phone for over 4yrs as I am clearly PWM sensitive.
I've read on notebookcheck that the S20 FE 5G stops flickering above 30% brightness and maintains 120hz which is still not a high rate but a sign Samsung are aware of the issue.
Question is = have they fixed/addressed this on the new S21 range?
I'm a big fan of Samsung, but this is also a big problem. I wanted to switch to S10 +, but my eyes have a big problem with brightness and sharpness, probably due to the PWM mentioned here. I'll try another type, but if it's the same, then I'm probably done with Samsung for a long time. I'm currently using the S7, which is also not ideal, but the image is at least completely stable and sharp.