Hello. I did a little research and decided to share it with the community. Please confirm or deny my investigation. Perhaps I missed something or misunderstood.
This review point to high pixel response times:
Poco X3 NFC smartphone - Equipment champion in the mid-range
The Poxo X3 NFC offers a Snapdragon 732G, 6 GB of RAM, 64/128 GB storage, microSD support, an audio port, an IR blaster, Bluetooth 5.1, fast LTE, and a powerful 5160 mAh battery for little money.
www.notebookcheck.net
Black to White24.4 ms (rise and fall)50% Grey to 80% Grey44.4 ms (rise and fall)
This means that the display will have time to fully display (pixels have time to completely change color) approximately 23-42 fps.
fps = 1000 ms / 24 or 35 ms
But already at 60 Hz, each frame will have time to be displayed by about 49-71% (this is how far the pixels have time to change color).
Code:
100% = 24 or 35 ms
X% = 17 ms (1000 ms / 60 frames)
And at 120 Hz, respectively 23-33%.
In simple terms, scrolling black text on a white background at 120 Hz, each frame has time to be drawn only by ~30%. Therefore, instead of black text on each frame, we see a smeared gray trail. And we get a motion blur effect.
Display motion blur - Wikipedia
en.m.wikipedia.org
Are my conclusions correct and is the POCO X3 NFC screen really that slow? Because I actually see a lot of blur at 120 Hz in dynamic scenes (the scrolled text is actually unreadable), but I don't have the equipment to confirm my calculations.
Feedback to the screen of my device for statistics
Model: dsi_nt36672c_huaxing_fhd_video_display
The trails are visible only when scrolling text or other contrasting dynamic scenes.
There is uneven backlighting along the edges (especially at the bottom), but if you look at the screen strictly perpendicularly, it is invisible, even on a white background, the darkening is clearly visible only at the bottom.
There is no purple tint around the edges of the screen, as in some reviews, just a dark/gray gradient.
There is no need for equipments, You can notice this clearly when pages on dark and text white you will see noisy blur effect
I don't know if it hardware or software matter
Related
Hey, to shoot the question right away; is there a way to properly calibrate your mobile phone screen?
I've searched the forums and googled and haven't found anything I was looking for.
Preferably being able to load color profiles like sRGB or Adobe RGB directly.
I'm not reffering to simple RGB settings or Gamma tweaking.
The reason I'm asking is that I work in 16 bit float mostly and got a perfectly calibrated IPS NEC nicely working with a 12bit LUT and also 2 calibrated TN panel screens.
The final image goes to 8bit PNGs and JPGs with sRGB embedded.
Now the difference between the final outcome on the IPS screen and the TN ones and the one displayed on 4 different android mobile phones I got available for testing is extremely big. So big, that just everything is off.
I thought that embedding color profiles might cause this but using other common profiles or none at all still were extremely off.
I'd like to point out that the image is not necessarily bad, it's just wrong knowing how the end result looks on perfectly calibrated monitors at home or at work.
I'm just surprised that there is close to no information available on how to properly view imagery with embedded profiles considering that the internet is full of fancy mobile phone screen tests and benchmarks nitpicking every single micro millimeter on a screen light years away from normal use conditions.
(At least they don't take into account that probably 60-80% of the images average users view on their mobiles are crappily compressed Facebook .jpgs and the rest photographs shot on mobile cameras..but that's not what the thread is about.)
Is there really no way to counter factory presets?
It's like with TVs on factory or even worse shop presets with shiny oversaturated colors and crushed contrasts, but on TVs you got the chance to turn the crap off at last.
Any idea or guidance would be highly appreciated.
Bump.
I need to calibrate my phone's screen color too, I know I can't expect miracle from the screen of my Xperia Mini, but at least I want to have more natural colors on the screen, Bravia Engine doesn't help at all in color quality, it only increases the sharpness, contrast, and saturation, no better color reproduction at all.
I have SE Hazel, an SE proprietary OS powered phone (DB3350v2), with dispdriver.dat tweaking (only editing the strings for RGB gamma settings inside it), I can make it reproduces far better and more natural colors than my Xperia Mini.
I don't want to make my Xperia Mini screen has the same color reproduction as a calibrated IPS panel, I only want, at least it can reproduces more natural colors than it does now, I also know that even the same phone model don't always have exactly the same screen color reproduction.
From my searches so far, colour management seems to be completely missing in Android.
I'm a photographer and would like this too. I want to use my tablet to review photos, but the colour is way off.
flar2 said:
From my searches so far, colour management seems to be completely missing in Android.
I'm a photographer and would like this too. I want to use my tablet to review photos, but the colour is way off.
Click to expand...
Click to collapse
my phone display produces too strong blue and red, less green, it makes most photos look far from natural.
Are u sure that opx is true black amoled??
What if I say you ... that ..It has a backlight ..
Wanna verify?
Important: make sure u have brightness slider to near low levels. This backlight is not seen at high brightness levels.
Download a gallery like quickpic that lets u open a picture in Fullscreen mode so that picture fills entire screen.
Make a bmp image in ms paint in windows and fill it with perfect black. Or download from some website with hex value coding -enter zero for all numbers
Now load this picture in quickpic or any other Fullscreen gallery.
Switch off every light in ur room .make d room jet dark
Wait a few seconds for your eyes to adapt to darkness
U will see the backlight instead of black.
For more easy recognition see in peripheral field of vision, where low light vision is good. (Focus point of eye doesn't have low light vision ,am a doc.) (see somewhere else, bring in the phone into vision filed)
If u think the gallery is d problem.
Do this same thing in any other amoled phone. You will know the meaning of black.
(I did in Moto x ghost )
It's not a backlight. No AMOLED screen uses a backlight. That would defeat the whole purpose of AMOLED.
What happens is, even if the pixels are black (switched off), they are fed a tiny amount of voltage from the motherboard to allow quick switching of colors so they are never completely turned off. As a result, even when displaying black they emit a very faint glow.
I'm not sure if this only happens on pentile displays (like the one in the OPX and most Samsung phones) and I can't verify since the only AMOLED devices I own are pentile, but my Galaxy S3 Neo also has this "problem". Personally I wouldn't worry too much about it, since even with the glow the blacks are WAY deeper than any LCD display with a backlight can produce.
SpaceDye said:
It's not a backlight. No AMOLED screen uses a backlight. That would defeat the whole purpose of AMOLED.
What happens is, even if the pixels are black (switched off), they are fed a tiny amount of voltage from the motherboard to allow quick switching of colors so they are never completely turned off. As a result, even when displaying black they emit a very faint glow.
I'm not sure if this only happens on pentile displays (like the one in the OPX and most Samsung phones) and I can't verify since the only AMOLED devices I own are pentile, but my Galaxy S3 Neo also has this "problem". Personally I wouldn't worry too much about it, since even with the glow the blacks are WAY deeper than any LCD display with a backlight can produce.
Click to expand...
Click to collapse
Thank God man.
I thought my phone is fake display.
Ur reply is proof that knowledge helps..
Btw just curious.. what are you?? How do you know this information not available in internet... So nice to see you man.
And regarding ur doubt, whether this happens in non pentile array amoled ...
NO.
I own a RGB amoled -Moto x ghost phone. It doesn't happen there.
I will check in moto x droid turbo . My cousin has it. So I will do and post results here.
And I wish to add this :
A 312 ppi RGB amoled (I have moto x ghost, 720p, 4.7 inch) is way better much much better than 440 ppi pentile amoled ( I have opx, full HD 5inch)
If I compare the images, they are much cleaner and sharper than opx . It's like the image has a depth, there is some stillness kind of feel. ...( I use colour control kcal, and so I test the displays in many settings not just default.
For example to make the images look similar as moto x ghost so that we can compare, I use rgb values as 32, 30, 27 value at 123, contrast at 121 and then slide the brightness slider to 3/4 or more.
Now both images look same in terms of how much dark areas are visible , the white wash noted in opx is now gone.
Now the images are ready for comparision.
Now the difference is the sharpness or clarity in rgb amoled. The feel difference i get is that there is depth in RGB. Its has a grip.
Reading e-books in night mode (dark brownish background and yellowish font) is the only situation where low light performance of the screen is critical to me. The QHD screen on the Note 4 performs admirably in this regard. The brightness I use is around 5%.
I'm worried the P-OLED might blur the font edges and give them a grainy look, effectively negating the benefits of a higher resolution screen over 1080p. I would not wish for any extra strain on the eyes; I tend to read every night in bed.
Any night-time e-book readers that own the V30 out there?
Uoppi said:
Reading e-books in night mode (dark brownish background and yellowish font) is the only situation where low light performance of the screen is critical to me. The QHD screen on the Note 4 performs admirably in this regard. The brightness I use is around 5%.
I'm worried the P-OLED might blur the font edges and give them a grainy look, effectively negating the benefits of a higher resolution screen over 1080p. I would not wish for any extra strain on the eyes; I tend to read every night in bed.
Any night-time e-book readers that own the V30 out there?
Click to expand...
Click to collapse
Asking for other e-book readers experience is smart, but be aware your "5%" on the Samsung Note 4 may be much different on other phones.
What is your "5%" in lumens? Give us a real number. Each OLED OEM sets a different minimum brightness level. Saying you like 5% on Samsung Note 4 is useless. That might be 20% or 25% brightness of the LG V30...
That's what Google did for the 2017 Pixel 2 XL -- even though they use the same LG display as the V30 Google set a much higher minimum brightness level. 5% of the Pixel 2 XL is 25%, 30% of the V30. LG lets their display get MUCH darker.
Here, go read this and look and side by side pictures.
https://forum.xda-developers.com/showthread.php?p=74928406
Sent from my official carrier unlocked LG V30+ US998
Yes, I am aware 5 % on the Note 4 is not the same on the V30. I just mentioned it in passing, could just as well have said I keep the screen on "almost as dark as it gets".
I think a further question is, are the display issues less noticeable on dark brown/blackish background vs. the grey most comparisons use as the example?
I keep the background not-quite-black and font not-quite-white (in ither words: yellowish), because it's easier on the eyes than the contrast of simple black and white.
Hello RXT Users,
I bought a new Realme XT (6GB,64GB, Pearl White) Mobile, which works like a beast.
But within a week, I accidently noticed that the true deep blacks of Amoled display actually kills the surrounding Grey colour pixels especially in videos (or moving frames).
When I using Instagram, Samsung just posted some photos. when I try to swipe one photo horizontally, I noticed that the gradient colours (White to black) are like vanished some time and and a bluish shade is appearing btw the blacks and whites.
Then I started comparing this with other LCD panel, which is not doing these weird things. I also did a side by side comparison btw Realme XT and other LCD display by playing a dark horror movie. The results came was not expected.
First things first, the picture quality, colours, contrast and viewing angles are awesome in Amoled display, But the grey coloured details which are nearer to the black pixels are missing, they are completely gone.
Example:
• Original frame in the movie - A dark room with cupboards and interior.
• Picture shown in LCD display - white blushed dark room with cupboards and interior.
• Picture shown in Realme XT - A Deep Dark Black room with no interiors no cupboards or even no walls.
I can't understand why the Amoled display takes more time when pixels changes from black to grey colours, may it's because of low refresh rate.
Can anyone please tell the display refresh rate of Realme XT and try the above tests to clarify that I am not the only one who got these weird thing. Thanks in advance.
Note: I am using Amoled display for the first time.
This is quite disturbing to know. I was planning on buying XT and returning my Poco armoured, as it has ghost touch issues and I don't need that much processor power for daily usage.
Also, with XT getting started on development I hope I won't miss Poco. But with the above-mentioned issue, I'm getting skeptical because my primary reason to get XT was AMOLED display. I don't want to get disappointed by it.
Although it doesn't has ambient display and dark mode yet but I hope it'll be there in future updates.
Sent from my POCO F1 using XDA Labs
After reading this post I checked my xt's display for the greys in dark scenes with my le 2 LCD display and I'm pretty satisfied. I was able to see most of the details of dark scenes that was visible on the other phone. Plus I found it's very vibrant as compared to the le 2 and brightness level is also much better.
SaiNikhil said:
Hello RXT Users,
I bought a new Realme XT (6GB,64GB, Pearl White) Mobile, which works like a beast.
But within a week, I accidently noticed that the true deep blacks of Amoled display actually kills the surrounding Grey colour pixels especially in videos (or moving frames).
When I using Instagram, Samsung just posted some photos. when I try to swipe one photo horizontally, I noticed that the gradient colours (White to black) are like vanished some time and and a bluish shade is appearing btw the blacks and whites.
Then I started comparing this with other LCD panel, which is not doing these weird things. I also did a side by side comparison btw Realme XT and other LCD display by playing a dark horror movie. The results came was not expected.
First things first, the picture quality, colours, contrast and viewing angles are awesome in Amoled display, But the grey coloured details which are nearer to the black pixels are missing, they are completely gone.
Example:
• Original frame in the movie - A dark room with cupboards and interior.
• Picture shown in LCD display - white blushed dark room with cupboards and interior.
• Picture shown in Realme XT - A Deep Dark Black room with no interiors no cupboards or even no walls.
I can't understand why the Amoled display takes more time when pixels changes from black to grey colours, may it's because of low refresh rate.
Can anyone please tell the display refresh rate of Realme XT and try the above tests to clarify that I am not the only one who got these weird thing. Thanks in advance.
Note: I am using Amoled display for the first time.
Click to expand...
Click to collapse
Thats how amoled works.. Not problem phone.. Amoled screens are like that..
When viewing my S21 straight on colours are accurate but when viewing from an angle of about 30 degrees I have a strong blue tint.
I know AMOLED screens do get colour shift but this is stronger than I expected, do all S21s do this?
Ollie2 said:
When viewing my S21 straight on colours are accurate but when viewing from an angle of about 30 degrees I have a strong blue tint.
I know AMOLED screens do get colour shift but this is stronger than I expected, do all S21s do this?
Click to expand...
Click to collapse
No issues on my S10 AMOLED display.
You can try to adjust colours in settings - display with several options. And there are color filters you can set in settings - accessibility - visibility enhancements.
Maybe it helps ... a little bit.