Hi, my english won't be very good because it's not my native langage.
I'm very sensitive to the flicker caused by PWM (Pulse Width modulation) wich is a technique used in the backlighting of a lot of LCD display to dim the brightness of the screen. I'm a "migraineur with aura" wich is a neurological disease, so like epileptic people my eyes and my brain are very sensitive to all sort of visual stress even the most subliminal one like PWM used at a high frequency. And I wanted to know if the note 10.1 (2014) use PWM to dim the screen at all level of brightness? I m' sure that it use it a least until 50 %, and that it is not PWMed at 100% brightness. Cause at 50% i'm sick litteraly within second, and at 100% i'm ok. But I have not tested all the level between 50 to 100 cause if it's flicker I can have quite a serious seazure, which would leave me ill for days, so it's quite hasardeous for my health. So what i'm doing is that i leave the system brightness to 100% wich of course is too bright, but I dim it with a soft (screen adjuster) that can dim the display without touching the backlight. But it's not a perfect solution cause the display is still using a lot of energy that way and there's a lot amount of blue wavelenght coming from it and i'm sensitive to blue wavelenght too. Basically as you can see, LED backligh is not a very good technology for epileptic people, eye-sensitive or migraineur. (I personally think it's not a healthy tec for anybody)
So, I just wanted to know if someone know if there's an "official" level where the note doesn't use PWM anymore to control the brightness of the screen, I mean below 100? Thanks in advance, and i'm sorry if my post can sound a bit confuse, it's not easy to try to ask and explain something in a langage that's note your native langage. Thanks in advance.
Maybe an odd question for XDA, but a question I need answered before I pull the trigger on this phone. Earlier this year while buying a new television set, I learned that I am amongst a small minority of people who are sensitive to LED-lit electronic displays that use pulse width modulation to control brightness. Apparently, I can look at a PWM CCFL-backlit (i.e. my 5-year-old computer monitor or my Nexus 5) screen or a DCM LED-backlit screen (my television set) for hours with no issue whatsoever but I can only focus on a PWM LED-lit screen briefly before I start experiencing symptoms of eyestrain and motion sickness. It's like looking at a CRT that flickers because the refresh rate is set too low. Now I know an AMOLED lacks a backlight layer, but it still has to adjust for brightness, so if it uses PWM to do so, then I have to presume it will cause the subtle flicker leading to the same problems that I've experienced with LED-LCD displays. Is there anyone here who could possibly shed some light (no pun intended) on this issue?
Yes, it uses PWM. My suggestion is to buy the phone, and if it bothers you, utilize the return window where you will receive a full refund.
PWM is a cheap way for manufacturers to implement lower brightness, by repeatedly turning the backlight on and off.
Unfortunately, for a lot of people, this causes eye strain and headaches.
Most (all?) AMOLED displays use PWM, including the Tab S.
There already is a PWM free kernel for S7 Edge here and it looks like it could be possible to do it on the Tab S too.
Is there a developer willing & able to do it for the Tab S?
Thanks.
I'am sensitive to PWM, but TAB S 10.5 does not cause eye problems for me. I can read for 12 hours on this tablet without any vision problems.
Hello everyone,
I have seen tech youtubers test the F3 and some mention that it will dimm the display quite a lot when gaming. (also another one did 4k video shooting for extended time and seen the same thing)
Do you think this is because the SD870 really "could" have an heat issue in the F3 and the software is protecting the AMOLED from damage due to overheating?
However I am still looking forward to receive mine, I just want to utilize the bright display at least during normal usage
Not sure what happens, I'm seeing the same stuff on diferent video reviews of Poco F3, the thing is, Poco X3 or Redmi K40 Pro usually go even beyond 10+ºC higher and do not suffer of such dimming issue. I'm guessing it's something software related.
Yes agreed, the SD888 devices get hotter and do not show this behavior.
Let's pray it's a software issue.
Could also be that the E4 Samsung panels really do need to derate because of their really high brightness. Even a 50% reduction would be as bright as my F1's screen at max. brightness
I am reading in local Malaysian forums they talk about comments in Xiaomi forum for k40 having such issue. I don't understand mandarin I am based on what they said its an issue with K40. Let's hope software upgrade could fix this issue.
Saw the same problems in some reviews yet a member of this forum who already has it had some issues with haptic feedback others have battery problems. I think I will buy another phone
MySelf_v1 said:
Saw the same problems in some reviews yet a member of this forum who already has it had some issues with haptic feedback others have battery problems. I think I will buy another phone
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Well quality problems exist everywhere. Check out the S21 Ultra forum, there big discussions about poor camera quality are ongoing.
MySelf_v1 said:
Saw the same problems in some reviews yet a member of this forum who already has it had some issues with haptic feedback others have battery problems. I think I will buy another phone
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Yeah don't get me wrong, only having a slightly noisy haptic feedback motor is not a bad result. When I bought my Oneplus 3 back in the day, the USB-C port was slightly offset, so the cable wouldn't fit snugly and dash charging wouldn't work. I've reported my problem with the haptic feedback motor on another forum and people seem to agree it is slightly noisy, but other than that the phone works like a charm for me (so far).
@Kom_zo That is reassuring to hear, glad you enjoy it
Maybe this was Xiaomi's design intent all along to have a more "audible" motor.
I will check it out once I have it here.
Did you experience any high heat and unintended dimming so far?
I have not had the chance to use my phone intensively yet, just some light browsing and Youtube/Netflix. I have however just made a video of the haptic feedback sound and I can tell you that this is not by design (the popping noise is coming from the phone, not the recording)
@Kom_zo Thanks for sharing!
Agreed, it definitely sounds not normal - somehow like a hollow "clicking".
Is it bearable or will you return it?
I have haptic feedback turned off by default, but my phone will vibrate for alarms/notifications and calls. As of right now it might just sound broken, but it is a moving part that could cause more damage to the internals of the device. I will try to swap it for a white model in a few days, but I think I will return it either way.
GeForce66 said:
Hello everyone,
I have seen tech youtubers test the F3 and some mention that it will dimm the display quite a lot when gaming. (also another one did 4k video shooting for extended time and seen the same thing)
Do you think this is because the SD870 really "could" have an heat issue in the F3 and the software is protecting the AMOLED from damage due to overheating?
However I am still looking forward to receive mine, I just want to utilize the bright display at least during normal usage
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This is comment mind you frm Malaysian forum. I don't know anything about amoled
Zenkilla said:
This is comment mind you frm Malaysian forum. I don't know anything about amoled
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I agree with the statement from the Malaysian guys, it makes sense.
However there is a video from the same youtuber which shows Black Shark 4 vs F3 and the BS4 doesn't dimm the display.
Though I don't know which brand/type of amoled the BS4 uses.
Edit: Found it, watch from minute 2 onwards:
Is there any green tint with low brightness?
bassbounce said:
Is there any green tint with low brightness?
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Shouldn't happen, since the F3 uses PWM for the amoled screen which eliminates color shift at low brightnesses.
This problem happen too when you off auto brightness ?
I think the tech youtube has set it to manual max. brightness.
I can only assume it will limit brightness at high temps regardless if you are on auto or manual.
I might get bashed for this but you can underclock and undervolt the GPU with KonaBess: https://github.com/xzr467706992/KonaBess
It's worth a shot if you don't game a lot, it'll likely not overheat causing the screen to dim as much.
I still feel the screen dimming will be reduced with the upcoming MIUI 12.5 update for the F3.
POCO said on a live stream that they are working on the dimming problem.
42:59 and at 1:06:19
Bonondo said:
POCO said on a live stream that they are working on the dimming problem.
42:59 and at 1:06:19
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Excellent, thanks for sharing this information!
Hi, is this issue still a problem? After some time during gaming you are not able to get the backlight over 50% like on this video:
Dimming
Or it have been solved by the latest updates and you are able to set maximum brightness even after half of an hour of gaming?
I think the dimming issue has been significantly reduced and fixed with the latest firmware.
It still dims but not by much, you might not even notice it at all depending on how much you're into the game or how sensitive your eyes are to light change.
Dimming is fine for me. I think its really feature not an issue for thermal purposes.
I'm more worried in touch delay issue. They marketed this device with high touch response and how come it would have an issue in the hands of customers.
Two words: Android 11.