I posted this on the galaxy s forums too, but it seems a little dead there.
As seen by the NoLED app over in the (galaxy S) dev section, and in a few other places on the net, people are finding that when they display a black image on their amoled/samoled screens in a dark room there is still light emitted by the display. it is not truly black
I would like to know why!
One thing i hear is about image compression and signal noise causing the pixels to not display #000000 black and instead a variant of black/grey causing the pixel to become lit.
This problem is not an issue during the day, i can't tell the difference when my screen is displaying black or off. but what it does effect is battery life.
If the screen isn't powering down its pixels then it is not saving anywhere near as much power as it could do
Were we cheated of our true black?
My phone has the AMOLED. I did notice that I can see the backlight through a black screen, usually during boot up. It dosent really bother me. I didnt feel cheated or anything like that. The images look fine.
My phone could use better battery management, my MT3g battery spoiled me.
The odd thing is that there is no backlight on OLED displays - the light is produced by each individual pixel. It ought to produce true black as the pixels should be entirely off, producing no light at all.
The problem with your analysis is that your using a third party app to test this,
what if the code is messing with the display ????
best way to test this is to upload a black image onto your phone and keep it on for a few hours , now check if the display is consuming battery in the battery usage screen, report your findings here ?
Btw normal AMOLEDS differ from S-AMOLED , they don't have true black so they need to turn on the pixels in the display to display blacks.
They should be the same actually, same technology powering the pixels, same lack of a backlight.
I did my testing on the galaxy S with its super amoled, showing a true black bmp image and the screen is still lit.
There shouldn't be any reason to turn on pixels to display black - black is the absence of light, so creating light to display black is rather counterintuitive.
Pure blacks can't be expected from an LCD because the pixels have to block the light from the always-on backlight, but they ought to be achievable (as far as ambient lighting conditions permit) from an OLED.
I do wonder if this is something PenTile-related, but considering that's a technology designed for OLEDs, you'd hope not!
The PenTile display, iirc correctly, has a white subpixel. Maybe thats where the light is coming from?
ooo .... ooo .... ooo .... does that mean by default no more BLACK screen of death??
On a serious note, i'd find it odd that a program can screw up showing a black screen. Wasn't it usualy a case of (well in my day anyway!) poking #000000 to the "pixels" address? (or however many 0's you need for a true 16bit display)
it cant be because its a RGBW display because each led can still be turned off. there still is no backlight.
Also i doubt its RGBW, most likely RGBG
android53 said:
Also i doubt its RGBW, most likely RGBG
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Yeah, pretty sure it's RGBG. RGBW is a different PenTile layout.
omg you all need a life or a star trek convention to go to lol
AndroHero said:
omg you all need a life or a star trek convention to go to lol
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you DO know YOUR on a geeky phone forum, right?
(Sadly though, i think you are correct!)
AndroHero said:
omg you all need a life or a star trek convention to go to lol
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My life is my phone, and the next StarTrek convention isnt until August 13th in Nj, so until then well debate about screen pixels and how black is black on an AMOLED.
Are you guys using true black? In CMKY terms true black is not 100 100 100 100, or RGB terms 0 0 0. That means 100% color of each of the 3/4 colors. In the printing industry if someone chooses black like this from the color pattern it comes out as greyish black in print.
Heres a good artcle that should help you guys make a true black image in photoshop.
http://www.andrewkelsall.com/the-professional-designers-guide-to-using-black/
Hopefully after reading this you will find that the tests people are using and the color black are very volatile. First make a true black image, then test from there.
maxpower097 said:
.... In the printing industry if someone chooses black like this from the color pattern it comes out as greyish black in print.
...
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A black is easily achieved in assembler (and i'm assuming therefore in C) by simply setting the pixels on the bitmap to 00,00,00 (maybe a few more zero's for more colour range?). This is the "true" black of a device.
i used photoshop to get a high quality uncompressed RGB 0 0 0 bmp image.
the screen is still lit
android53 said:
i used photoshop to get a high quality uncompressed RGB 0 0 0 bmp image.
the screen is still lit
Click to expand...
Click to collapse
I'm wondering if thats the best way to test it. If your viewing your image you created in PS it could be rendering it into colors like 1,0,0 , or 0,0,1, etc.... I would imagine you would need to write a program that actually sets each pixal at 0,0,0.
Problem
The display on my s3 mini is not showing true black but a feint gray shade and it has few curved lines that are COMPLETELY BLACK...I'm wondering if I can make the whole display black as there is nothing wrong with the screen...I was unable to capture this on camera as it was too dark
I'm kind of late to the party but...
I saw that problem on my Samsung Galaxy Express (similar to S3) but I moved away from Samsung for a few generations. Now on my A52 I saw the same "problem".
Turns out it's the eye confort shield that turns the screen dimmer and yellowish, it was messing with the true blacks. I disabled it and couldn't see anything at all it was pitch black.
Not sure if that was the problem with my old Galaxy device... But it makes sense that when you notice it the most, is when that eye protection is active.
Hope this helps anyone
I have two Nexus S at the moment and they both have significantly different screen rendering while running the same ROM with the same customizations and brightness. This shows up most clearly with the wpclock wallpaper. I took a screen shot of each to post in the wpclock thread to see which of the renderings was most similar to other people's screens. The screen shots for both phones looks the same on my monitor, which I guess makes sense because a screen shot is a representation of the data of the picture and not an actual picture of the rendering on the screen.
Is my most accurate NS as far as screen color goes the one that matches the screen shot on my monitor? This assumes my monitor is fairly decent. I need to return one of the NS and I really don't know which is the more accurate screen rendering, one looks saturated with red and the other looks saturated with blue.
I had only looked at the phones individually before and thought the screen looked great on both, so it's really not that big a deal. When I looked at them together I noticed that they rendered quite differently and the red saturated one is slightly brighter than the blue saturated one. The red one has only been used for a few hours and the blue one for almost 30 days.
replying directly to the topic tittle question
i'd say no
the screeshot is capture within the machine, it will always show the correct color even if the physical device (screen) is not displaying the correct color
there have been very few SAMOLED screen that came defective from factory (from SGS)
but so far we've not see that as of yet in the SNS
^^ Thanks for the reply.
I found some good information in this thread, in particular post #7: http://forum.xda-developers.com/showthread.php?t=883109
We can probably close this thread.
I have 2 Dell 22 inch LCDs here bought them at the same time and the colors are slightly different between the two.
my point being is that monitors and such display colors differently,
Well, there is any possiblity to calibrate the screen to have true greys?
In the menus theres no "violet" or "blueish" colours only black white and grey, but in moto g screen seems like its pinkish.
i just got a new moto razr hd
the device is brand new but the display looks all yellowish
my friend also has the same phone but when kept aside it shows brighter whites whereas mine shows yellowish tint
any info u guys know why this is there ?
Screen Yellow
My phone is also well..
i have checked forums and its not a defect its because the displays are made from different manufacturers
some intentionally make warmer displays for better skin tones look
but anyone knows any app to change the hue or colors of the display
My LG v50 Korean version that I recently purchased does not power off the pixel completely while showing black, I notice this when comparing my Xperia 1 and this phone.
Its very noticeable, the panel is still powering all of the screen while showing black while my Xperia 1 does not.. It's like having an extremely high contrast ratio LCD screen
Have anyone else noticed this, like playing this video https://www.youtube.com/watch?v=7Y9nX0QHqzA&t=1s in high brightness in a very dark room?
Or is it something wrong with my phone?