Note that the described tinting effect is IMO, and based on my eagle eye and 30+ years experience in the field neither caused by the color of the backlight LEDs (as one would immediately think from seeing the snapshots; I know backlight color variations ... this clearly isn’t one), nor as someone presumed, the panel lamination glue.
Question to Android developers who are familiar with Display Color Profiles/CLUTs and output filters (if such exist):
Already owning an Alldocube kPad and iPlay 20s, which I'm highly satisfied with, I recently purchased 8 pcs. of Alldocube’s new iPlay 50 via AliExpress (excellent deal: each 2 pcs. for a total of USD 225 delivered). The hardware built quality is as with the previous models excellent, but the display on the iPlay 50 has a major problem:
When placing the iPlay 50 next to the excellent kPad and iPlay 20s one notices that
the colors are completely off and have a greenish tint
an artificial contrast enhancement/image sharpening effect is obviously applied, which adds an annoying and disturbing halo effect to detailed areas and edges where dark colors adjoins lighter color (e.g. black against medium grey).
Both effects are globally, so not limited to a specific app or screen area.
Unfortunately the effect is very difficult to capture in photos, attached below are my best efforts (the chinese comments are meant for Alldocube’s Customer Support, which isn't very supportive on this issue, although it would be in their best interest).
In my opinion it is not a hardware (LCD panel), but rather a software issue, thus should be easily fixable by their software engineers. Note that it is NOT POSSIBLE to correct these problems through Android’s Settings > Display > Contrast & Colors! The greenish tint remains, and so do the artifacts of the unwanted, unnecessary sharpening. Greenish tint also isn’t affected by Material You.
Any suggestions or ideas how to fix this? Because if I can’t fix it, I'll have to return those tablets, which would be real pity, as the tablet as such with its laminated 2.000*1.200px 10.4" IPS panel is an excellent bargain.
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hello
i bought brand new one and its like yours i think that the lcd pannel are just bad quality
I have never seen a screen as bad as iPlay 50. I think it would be better if rooted to adjust the sharpness.
i forwarded this post to the seller, hopefully we get some update on it soon cuz i also experience this issue
Related
I can't see the banding all the time but when I do it's very annoying. I'm going to try and post some pics today. Is it normal or can I get it fixed?
No one at all has this problem or has heard of it?
what do you mean by banding? describe it properly
in my case specifically i can see faint gray horizontal lines going across the lcd on my phone about every quarter inch. it is especially noticeable on a white screen. i emailed the ebay seller and they stated that it was normal and i would not be able to return or exchange the phone since it was sold as new. i emailed LG about it and they said it would cost anywhere from $40-$100 if it was actually a flaw. like i said in the first post, i'm going to try and get some pictures up soon (hopefully in a couple hours after i get some sleep) to graphically show what i'm talking about.
DarkKnight62, if it helps in any way: I have observed this on my screen too. The faint gray lines made me believe text lines were burned in the LCD screen, but that would have been pretty much impossible, since I don't read that much on my phone. I can only see this effect when I use the screen as a flashlight - white background and 100% luminosity and it doesn't bother me at all.
masteryx said:
DarkKnight62, if it helps in any way: I have observed this on my screen too. The faint gray lines made me believe text lines were burned in the LCD screen, but that would have been pretty much impossible, since I don't read that much on my phone. I can only see this effect when I use the screen as a flashlight - white background and 100% luminosity and it doesn't bother me at all.
Click to expand...
Click to collapse
even I read a lot on my phone but I keep the brightness lower than the lowest default. so I dont have this problem.
I think, It's due to surface dithering. See our phone is not 16m colors its 256k so the colors that are missing are to calculated and displayed and that's why the horizontal band if the we set no surface dithering (custom roms mik) the banding just vanishes but the quality of display is reduced. All the linear gradient colors are no more gradient.
Sent from my LG-P500 using XDA Premium App
I do have this gray lines horizontally and vertically if you see the phone far and carefully only in white background... when its near, the lines just dissapears to my eyes, (like if they get used to the display)
"gray horizontal lines going across the lcd on my phone about every quarter inch"
I don't think he is talking abouth the lines between pixels.
can you post a picture so we can understand what are you talking about?
@DarkKnight62 I had a same problem. If you are using francos kernel (and/or roms that have it integrated) it's more visible - very noticeable on wallpapers with smooth gradients. Try switching to stock or mik_os CM7 mod 6.5.4 stable (which is great)...
@soberspine This is example:
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try enabling hardware acceleration??
Here's a side-by-side of two ATT GS2s on auto brightness showing the same application. The one on the left has a bluish/greenish tinge to the display, while the one on the right looks...I dunno...pinkish? Almost dirty by comparison, at least to my eyes, as it's much harder to read in low light settings. I thought at first it was the Helvetica vs stock font, but it's clearly the panel's lighting characteristics.
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Here are the same phones again running the 'dead pixel test' from the Market, set to max brightness on the white screen color test.
The one on the right doesn't seem to be able to produce a true white.
Now, I get that there are different screen suppliers, and manufacturing variances among panel batches, but this whole thing has me a little disappointed at Samsung's QC. I would love to know what qualifies as a successful screen test, because the one on the right is a huge disappointment to my eyes. Just for the hell of it I compared both screens to my old Captivate, and to my surprise that had the most accurate color reproduction of the three.
How bout you guys - true whites on your screen? (try the gmail app, for example) Maybe I just got a bad batch?
The screen on my SGS2 has no colot tinge whatsoever. It's white and bright. I did however notice a bluish tint on my Infuse; which drove me crazy. I actually exchanged 3 Infuses because of a flaw in market where I got the "unable to download, insufficient memory on device". Each Infuse had a different tint, or brightness to the display. I switched to thw SGS2 and haven't looked back since.
Sent from my SAMSUNG-SGH-I777 using XDA Premium App
Wow... big difference.... what the hell...
I thought this too about my SGSII when comparing it side-by-side with store units... Turned out for me the brightness was the same but another setting (adjust screen to save battery or something like that) was checked on my phone, making the screen look like crap on some colors, including making white look gray and yellow look bluish. Once I uchecked that box the display looked fine.
yeah I am anal about colors too. Being a photographer.
So I was looking for ways to improve the displays on my SGS2(now returned).
I have a Gretag i1-Pro spectrophotometer that I use for calibration and also matching color swatches. So I 'calibrated' my screen to the best of the available software. There is a program call 'Screen Adjuster' you guys can use to alter the RGB values. However gama will be off, and you can only calibrate EITHER high bias RGB or low bias RGB. There is no way to calibrate both.
Have you tried Supercurio screen tune? He just started making it but can probably help you out with colors and such.
http://forum.xda-developers.com/showthread.php?t=1313652
QC and screen temperature were both big issues with the ISGS2 when it launched. There's a 100 page thread that's been talking about it since May. Five ISGS2's side-by-side all had from slight to wild differences in color temperature. Some of the ROMs also alter color temperature which makes it even more confusing. Cool/blue is what's intended to be normal and warm/yellow is the exception. The phone on the right in the pic looks like it has a warmer screen. I'd guess they changed either the screen or manufacturing process for the ASGS2 or you guys would have been freaking out by now.
P.S. - Samsung manufactures all their own displays and they all come from the same factories. So if there are differences it's QC or allowable deviation.
HI
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Look very great on the xperia P, could you provide a download link to the wallpaper?
Sent from my LT26i using XDA
Things look FAR better on the Xperia P. I tried to not bias myself in as many shots as possible by not identifying which phone it was before deciding which was better, and in every single one I found the Xperia to be the superior display.
I do hope they're able to either overcome the size limitation of the white magic displays for LCDs, or at least continue this work on future OLED displays.
Wow. the quality of the xperia p display is unreal. Wish the xperia s came with white magic as well
vivftp said:
Things look FAR better on the Xperia P. I tried to not bias myself in as many shots as possible by not identifying which phone it was before deciding which was better, and in every single one I found the Xperia to be the superior display.
Click to expand...
Click to collapse
I have neither phone and stumbled onto this thread by accident so no ax to grind but there are some problems with comparisons of this sort in general and I have trouble accepting the statement as to bias quoted here.
As to the bias: it is impossible for me to not immediately know which phone display I'm looking at simply because the size difference of the image is painfully apparent in each and every instance with that of the Note being significantly larger. Even someone such as my self who "has no ax" can't avoid bias it's built into the human animal and can't be removed except by carefully designed double blind trials where there can be no hint of identity. No one could claim the conditions of the samples here are "double blind" in fact there is zero level of disguising which is which, ergo bias is an unavoidable consequence.
Regarding the comparison itself:No information is given regarding the displayed images. The resolution the original images were shot at is just one example of possible problems with the comparison. If the originals were shot at any other than the native resolution of the particular device in question it could appear distorted when scaled to the non-native display parameters. For example, if it were shot at qHD then blown to HD it would certainly suffer in the translation because the larger display simply can't offer more information than was contained in the original and might simply make any flaws larger and thus more apparent. A multitude of other artifacts could be introduced depending on conditions and even on the display of the screen of the device you are looking at the thread with.
In the image of the Headphones the words on the earpiece are very much clearer on the larger image on my computer screen ditto with the netting in the fruit image. On the other hand the colors and white balance appears to be better on my screen on the smaller images.
Is one better than the other? Very subjective.
Of course it's subjective. That's why we have some people out there who prefer to look of OLED displays to LCD, and vice versa. As for the comparison, yeah there are some pics where the size gives it away, but IIRC there were a couple where the sizes were similar. The pics aren't all loading properly for me now for some reason so I can't identify which one those are, but before making my post I did view the pics on both my tablet, 40" LCD TV and 55" LCD TV and in all cases I prefer the Xperia Ps screen.
I wanted to check the RAW capabilities of the 9T Pro main camera with the GCam. I am using Urnyx05's version 1.6 cam (not that that should change things for RAW if it is a true implementation). Raw file size was 23.1mb.
Today in Bangkok there is a fair amount of particles in the air and there is a noticeable line on the horizon before the blue sky starts. The image I took was not for composition but to check the dynamic range and noise. The bottom right of the scene is in mid morning shadow and I am facing basically west. Focus was set about 5.5 metres away form the camera near the rear wheel of the green Totoya in the right foreground.
Shadow noise was surprisingly better than I was expecting. I raised shadows with limited noise. But there is both colour noise and Luminance noise in the RAW image. There is a bit of chromatic aberration noticeable with zoomed in 2x in a few areas but it is mild. There is softening in the corners and this is particularly noticeable on the leaves in the top right hand corner. EDIT: It looks like my cam just seems to be softer in the top right hand corner than the top left hand corner. This is not uncommon on DSLR lenses either, but worth noting.
All in all it it was better than I expected. I have attached exported JPG (saved at a maximum 3mb size from Lightroom) and the settings for noise control and sharpening. Note these settings are based on a sample size of 1. No doubt I will change these to a more standardised preset as I manipulate more images.
I will be heading to Japan and Taiwan this week and I am still tossing up on whether to take my DSLR or just use my 9T Pro on a tripod. Either way I will be sure to use the phone cam to get a better range of images to continue reviewing the outputs of this 48mp sensor.
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Shooting in RAW is worth it for the main sensor.
Other sensors are inferior and you see their limitations in the RAW files. Wish the wide angle was of higher quality.
On many LG devices, there is "kcal" settings to tune the display to eliminate screen burn.
Here's a good example:- https://forum.xda-developers.com/t/...ontrast-and-also-get-rid-of-ghosting.3653992/
I cannot find any alternative or anything similar on the S8 or S9 forums which is strange considering burn in is a big issue on our devices too.
My question is, why is there no similar cure, what am I missing?, Or have I not being look hard enough?
TIA
TheInfiniteAndroid said:
On many LG devices, there is "kcal" settings to tune the display to eliminate screen burn.
Here's a good example:- https://forum.xda-developers.com/t/...ontrast-and-also-get-rid-of-ghosting.3653992/
I cannot find any alternative or anything similar on the S8 or S9 forums which is strange considering burn in is a big issue on our devices too.
My question is, why is there no similar cure, what am I missing?, Or have I not being look hard enough?
TIA
Click to expand...
Click to collapse
The OLED pixels are failing. The calibration and color accuracy as well. Since blue pixels die first any compensation be limited and you would lose color/gamma calibration. The blue pixel output is already near its max when new compared to the other pixel colors.
Red pixels generally have the longest lifespan. No way you can accurately color calibrate one of these display by eye.
Once an OLED display is degraded only a new display will really fix it.
The only thing you can do is reduce the wear by not using in direct sunlight. Use manual brightness control and keep below 50%. Use max brightness for seconds not minutes. Use dark mode and get rid of the notification icons at the top. Use dark wallpaper and red or darker icon packs. This N10+ has over 8k hours on it. No detectable display damage or degradation.
Limit exposure to sunlight and excessive temperatures including during storage.
A hot running phone is burning both the battery and display. Correct the cause of excessive power consumption.
OLEDs are very susceptible to water damage; keep water away from phones even if ip68 rated.
My N10+ AMOLED conservation management strategy. So far it remains in excellent condition even though it's been heavily used daily almost every day for 3 years. I slightly rotate the static homepage icons every month or so. Newer Samsung's incorporate pixel shifting as well.
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