http://www.lagom.nl/lcd-test/black.php
I've always used the above link for testing how accurate my displays are. The tests on that site I've found most important in descending order are black level, white saturation, and contrast. (the gamma calibration test never seems to work well on phones)
The Axon 7 (A7) is my first AMOLED display. My old phone is the Nexus 5 (N5) with an IPS display.
On the black level test, squares 1-6 all blend with the black background on the A7, while the N5 only loses square 1 to the background. On white saturation, the A7's last visible square is 251, while on the N5 I can see up to 253. Finally, on the contrast test the A7 colours start at 2-3, with red and pink washing out the soonest at 21. On the N5 all the colours are visible at 1, and red and pink wash out at 25.
Through all these tests it seems the stock A7 AMOLED display is over saturated with poor contrast. On the stock ZTE firmware, the only display adjustments are in settings under "screen effects". Mine is set to Natural and Warm, but all settings here do not affect the test results.
I've read that after many complaints, OnePlus updated their firmware to give the OnePlus 3 special RGB calibration tools. Are there any apps that could do similar corrections on the Axon 7? Any rooted apps, or would CyanogenMod correct this?
It's becoming quite obvious when browsing photos or watching video, and especially takes away from the experience in dark movies.
Related
Okay, so, one of the things that's really disappointed me with some recent Android tablets I've tried out has been the screen's color temperature and contrast:
1. The Samsung Galaxy Tab 2 7" and Toshiba Excite 10 all had very cold screens, with very blue-ish whites. Also, contrast was poor on both, so reading ebook on them with black text on a "white" background was unpleasant.
2. On some Primes I tried, whites were a dingy yellowish color (although I'm not sure that's because of the temp or some other issue), while some were a nice neutral-to-warm color.
3. The Toshiba Excite 7.7 screen varies depending on how much black/dark colors are being shown, clearly a power-saving feature. On screens with a lot of whites, the temp is made much coolor and contrast is reduced. On screens with a lot of darker colors, temp is warmer, contrast is increased, and whites are much less blue.
So, what I'm wondering about the Nexus 7 is this: what's the apparent color temp? Are whites "white," or are they yellow-ish (warmer) or blue-ish (colder)? And how's contrast, specifically black text on white?
I know I'll get the darn thing in a few weeks, but in the meantime I'm not finding any reviews that say anything other than "great screen for the money." And unless someone's being really careful, it's tough to show screen colors and temperature in pics and video...
This is the app I used to test: https://play.google.com/store/apps/details?id=engn.test.screencolor&hl=en
Contrast - Black: Squares 6 and above are clearly distinguishable, 4 and 5 are just about visible
Contrast - White: All squares are distinguishable
Color Scale - Brightness: All squares are distinguishable
Color Scale - Saturation: Highest 4 squares are equally saturated on all but orange, light blue and grey
This is with an AUO panel and default white balance - I'm hoping someone with a JDI panel (or indeed another AUO) can weigh in with their observations.
what is wrong with your display then?
I have the JDI (Novatek) and confirm the same crushed black levels with Color Test and Display Tester - except that only 7 and above are distinguishable. White contrast and brightness are the same as yours, but color saturation tests vary between the two apps .... personally I trust Display Tester better, which shows blues only are moderately over-saturated.
The crushed blacks are definitely noticeable in dark scenes with or without X-Reality. The panel is quite warm compared to others, and the White Balance settings are somewhat useless since they involve an overlay filter, it seems, and so just darken the screen.
ghtop said:
I have the JDI (Novatek) and confirm the same crushed black levels with Color Test and Display Tester - except that only 7 and above are distinguishable. White contrast and brightness are the same as yours, but color saturation tests vary between the two apps .... personally I trust Display Tester better, which shows blues only are moderately over-saturated.
The crushed blacks are definitely noticeable in dark scenes with or without X-Reality. The panel is quite warm compared to others, and the White Balance settings are somewhat useless since they involve an overlay filter, it seems, and so just darken the screen.
Click to expand...
Click to collapse
Yeah not too happy with the white balance setting compared to voodoo/cm colour settings on my old galaxy s, but gets the job done for the most part. Call me crazy but I like it even warmer than default
And hopefully there will be some software improvements to the display in Kitkat
how can i know if my device use JDI or AUO panel?
It says on the back of the screen
Sent from my D5503 using Tapatalk
pepeo123 said:
how can i know if my device use JDI or AUO panel?
Click to expand...
Click to collapse
Assuming you don't like the idea of dismantling your phone to check the back side of the panel you might want to follow my instructions in this post.
Yes Louis has the best way, sorry for my late reply, only just got my screen back in. Mines a JDI
Sent from my D5503 using Tapatalk
Z1c black w9 telenor-hungary auo-panel (no "blue" problem)
To dark, the dark areas (too high contrast/gamma), dislike me...
But, good deep-black.
Automatic background light regulation not a good idea (automatic brightness: OFF, x-reality: OFF ).
- sorry my bad english -
solution for "crushed blacks" here : http://forum.xda-developers.com/showthread.php?p=51945091
that's good
Darkimmortal said:
This is the app I used to test:
Contrast - Black: Squares 6 and above are clearly distinguishable, 4 and 5 are just about visible
Contrast - White: All squares are distinguishable
Color Scale - Brightness: All squares are distinguishable
Color Scale - Saturation: Highest 4 squares are equally saturated on all but orange, light blue and grey
This is with an AUO panel and default white balance - I'm hoping someone with a JDI panel (or indeed another AUO) can weigh in with their observations.
Click to expand...
Click to collapse
AUO Panel here. Results are pretty much similar in mine.
Color Scale - Saturation: The last 4 squares on the right end are clearly distinguishable for all except yellow and bluish green. Just about distinguishable for the green line.
On an unrelated note, I noticed that the INDOOR brightness level on the AUO panel is getting decreased by at least 4 levels on a scale of 100, when I put the slider to the lowest end and checked 'Adapt to lighting conditions'. You can see the difference very clearly by checking and unchecking the 'adapt to light' check box. Might save some battery during indoor use or ebook reading.
I started to notice uneven color or black botches under certain condition
the display look excellent during normal usage
- extreme whites & black are even and look fine, however the problem start to popup at dark grey just above the blacks i noticed a black botch in the lower display part
i detected the problem by doing the following
1- download (Full Screen Color Light)
2- Go to a dark room
3- set the screen color to dark grey, just above the black level
4- set the brightness to middle
5- noticed uneven gray color or black botches (similar to light bleed in Lcd)
Is this normal for super amoled display or should I RMA my device
note: issue isn't noticeable under normal light conditions
please help is everybody having this or should I RMA?
RMA the phone, that isn't normal.
Sent from my Nexus 6P
Not normal, I have seen the issue though from the Galaxy S2, Note 2 and Note 3. Im glad to report that on my Nexus 6P the black is uniform and deep.
EarlZ said:
Not normal, I have seen the issue though from the Galaxy S2, Note 2 and Note 3. Im glad to report that on my Nexus 6P the black is uniform and deep.
Click to expand...
Click to collapse
Black is deep and uniform in mine too, however the problem appears in dark grey only, as if not all the AMOLED pixels lit all together, or the voltage isn't uniform
making this pattern
appreciate if anyone can provide a picture of his dark grey screen in a dark room
Trying to be sure if it's either my device faulty or it's typical. As long as there aren't a lot of whites on the screen, it looks good.
Open Facebook or Chrome browser - or just anything with white background or lots of whites, and there is this blue tint over the white.
On max brightness it's not as bad, but if I turn on adaptive display, the darker the screen is, the more blue the whites are to a point, it's uncomfortable to read anything. Here is are some pictures what I'm talking about.
First one is a bit unfair, compared to Galaxy S7 Edge, but just look at the G5plus on the right. It's way blueish.
On the next picture, it's compared to a cheap Chinese phone (Nuu 3G) with a 720p display. Now, it may not show how blue it gets, because the brightness is on max to take the picture, but trust me, when it's halfway bright or less, it gets a lot worse with the blue.
Anyone else have this issue? Or is this the normal?
what i did was unlock the bootloader then flashed a kcal custom kernel to adjust the color. unfortunately, Moto and Amazon will not unlock Amazon edition bootloaders so that is not an option for you.
Not sure if it's visible but I'm fairly certain that I can spot this. Check the attached gif. Notice how the lower three thumbnails lag while scrolling . This thing is slowly making me insane.
Any suggestions? Phone is pure stock, no modifications, miui 11 global 11.0.1.
yes, i can also spot wavy motion when using Instagram in dark mode with brightness low.
the edges of images give some black wavy shades on scrolling same occurs when we use in direct sunlight color are too sharp on full brightness under the sun
I think you speak about the big AMOLED weakness, that's "normal" and can't be fixed...
It's normal for AMOLED displays and VA Lcd displays.
when its complete black pixels turn off and it takes a while for them to turn on again and show the new color
less visible in higher brighnesses
Yeah i have this problem any solution to fix?
Its very simple. Because we have an OLED display the individual pixels can and will turn off to display a true black. But when that black pixel that was turned off needs to change color to for example green, the pixel will have to turn back on again. And this takes a few miliseconds (probably more than 15ms, but thats just my opinion) thats why you see ghosting/trail. We cant do anything about this. Better have true blacks then less ghosting and greyish blacks on other panels like LCD.