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What does your BLACK screen REALLY look like?

Discussion in 'Android Devices' started by dhworph, Jan 27, 2012.

  1. dhworph

    dhworph Android Enthusiast
    Thread Starter

    ***warning: do not proceed if you are OCD about minor screen 'defects'...

    So, you need to watch this pure black video (pureblack_60sec_1280x720_indeo5.avi, indeo5 compression, 1280x720 resolution), probably on full brightness, in a 100% completely dark room. You may have to wait a bit for your eyes to adjust to the darkness... probably a good 60 seconds or so for your eyes to adjust to the darkness...

    It is pure black png, 1 frame per second for 60 seconds, no sound. It plays with MX video player, not the stock ICS video player. You shouldn't see any artifacts, aka blue crush of blue banding, except for the texturing of your screen (at least that's what I think it is).

    Look for the texture in your screen. I have a circular splotch just above the soft keys, centered, and a smaller dot on the left side (in portrait). I don't have a camera that is good enough to take a photo of it, as it would take a bit of exposure time..
     

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  2. Deleted User

    Deleted User Guest

    Huh, interesting.

    So, first of all, my screen is almost perfectly uniform. It's eeever so slightly lighter near the speaker than near the mic.

    Second of all, I'm actually surprised at how much light comes off the screen in a pitch black room. I stepped into the network closet, so it was as black as black can be. I hadn't tried that before - given ANY light at all, the screen appears almost perfectly black, but in total darkness, it glows just a tiny little bit. That's not my screen in particular, of course, just AMOLED screens in general.

    Cool.
     
  3. Jahmakan

    Jahmakan Well-Known Member

    Characteristic of AMOLED screens apparently, 'cause I have the same effect on my unlocked GSII.
     
  4. dhworph

    dhworph Android Enthusiast
    Thread Starter

    hm... maybe mine is one of the ones with a bit more more inconsistency... There is definitely two distinct small black blotches + the typical flyscreening (of coarse this is all very difficult to see). You really have to spend some time letting your eyes adjust...

    I'd like to get some more opinions... I'd be happy to adjust the video to whatever resolution and color, if someone requests too...
     
  5. Rons

    Rons Member

    does this still work?
     
  6. mttfrog13

    mttfrog13 Android Enthusiast

    yeah this "defect" if it can even really be called that is visible on the gnex and droid razr although it seemed much worse on the droid razr to me. It is in fact not visible on the sgs I and II super amoled+ screens. The screens on the SGS screens are basically a true back and do not emit much life is any at all. In a pitch black room, with a black image on the screen, you wouldn't even be able to tell the phone is on at all.
     
  7. Deleted User

    Deleted User Guest

    Incidentally, this is not a true "black screen" - or, at least, the Nexus doesn't display it as such. I was amazed at the amount of backlight coming from the screen on an AMOLED but last night I noted that the black area around the navigation buttons is MUCH darker.

    So, either the video isn't true black, or the video player isn't rendering it properly - but while it's a dark screen, it's not entirely black.
     
  8. dhworph

    dhworph Android Enthusiast
    Thread Starter

    Well... Another thing to try is dead pixel test black, but that leaves the softkeys on. I suppose you could kill the sysbar service (I can't remember where I saw that, but I saw a restart option for it somewhere that killed the notification bar and softkeys, and it took about 30 sec for them to reappear. Then you could compare the dead pixel test black to this video's black.

    I guess the questions are: (1) does the amoled black still use some power and emit some light? --- Also noLED is a neat notification program that supposedly only lights certain pixels. could compare that black to other blacks.

    and (2) Is it possible to get a true black in a video, if a true black exists? i.e. having a black in a video that actually doesn't power the black pixels... but maybe switching them on/off would be less power efficient than having them at the lowest possible brightness.

    I'll try to test some other blacks tonight to get another comparison. Also, this video is compressed with indeo5, I'll compare it to the uncompressed version to see if there is any difference in brightness.

    *another idea for a black test would be to make the boot animation pure black pngs, and watch that in a completely dark room to see how different it is from this video.
     
  9. sooper_droid12

    sooper_droid12 Android Expert

    Why does it need to be video? Why can't you just display an absolute black image to see light leakage? I do this on HDTVs to show how backlighting is not always uniform?
     
    jbdan likes this.
  10. dhworph

    dhworph Android Enthusiast
    Thread Starter

    A video is the only way I know how to get completely black display (i.e no softkeys or notification bar). Plus I'm wondering if black behaves differently in video players as compared to the blacks displayed in other apps.

    If someone else knows a better way to get a completely black screen (other than turning it off), please chime in!
     
  11. dhworph

    dhworph Android Enthusiast
    Thread Starter

    In my opinion, the brightness of this pure black video is the same as with dead pixel test and noLED.

    A relevant thread on xda: screen blackness - xda-developers

    It seems there is a minimum voltage applied to blacks. It may be built into the OS software though, rather than a manufacturing thing though.
     
  12. Deleted User

    Deleted User Guest

    That may be - and is why I assumed that the minor glow from the screen during this video was simply normal - but there is clearly some way to closer to true black.

    Here's a test for you - go into the clock application, and then tap a blank area of the screen. The screen dims and ostensibly goes "black." However, the notification and navigation bars a very clearly darker than the rest of the screen. That's about the level of black that the video produces.

    If you pull up a black image in the web browser or the gallery, you'll see that it's actually the same level of black as the nav bar or the notification shade.

    If you view each in a completely black room, you'll see that there is still a little bit of glow from a black image pulled up in the gallery, but noticeably less than the video.
     
  13. dhworph

    dhworph Android Enthusiast
    Thread Starter

  14. LMAO here we go again people and there crazy minds. When in dark playing hide and seek and look at my phone black looks not so good haha. J/K.
     
  15. dhworph

    dhworph Android Enthusiast
    Thread Starter

    I replaced my boot animation with full res #000000 pngs. And powered down waited for my eyes to adjust... booted up closing my eyes till the google logo disappeared... man i can tell you that thing is BRIGHT!
     
  16. Deleted User

    Deleted User Guest

    Well, I kind of expect a certain amount of glow coming from the screen even when set to completely black. I'm guessing the variability between "true" black (i.e. totally off) and a black image (i.e. the current small glow) is not infinite and they keep a minimum voltage to prevent a "jump" between true black and the minimum actual black level.

    That's totally speculation, incidentally, just thinking out loud.

    So the issue isn't that the screen glows a little (the overall screen calibration), what I'm observing is that the difference between a video playing black, and a displaying a black JPG, is noticeable.
     
  17. techno_techie

    techno_techie Lurker

    I have the light leak, but I have deep black black dots ALL OVER the screen. They are only visible on the black screen using a pixel test tha eliminates the soft key bar. It looks like a speckled egg with these tiny dots of different sizes. I just want someone to say this is normal because I don't want to have to replace the phone. I'm concerned this is a fabrication issue, not a calibration issue. I'm going to see if I can take a long exposure photo of it.
     
  18. dhworph

    dhworph Android Enthusiast
    Thread Starter

    What pixel test are you using? I couldn't find one that eliminates the softkeys.
     
  19. techno_techie

    techno_techie Lurker

    It's called lcd test in the market. The directions use the black color, don't touch the screen, soft keys roll off. My largest black dot is just to the left of the tasks soft key.
     
  20. dhworph

    dhworph Android Enthusiast
    Thread Starter

    thanks, it works good... gives me hope that I'm not crazy... someone else is able to see the screen "texture" when it's pure black!
     
  21. techno_techie

    techno_techie Lurker

  22. fortesquieu

    fortesquieu Android Expert

    That looks gross. Can you exchange that phone?
     
  23. jamisont

    jamisont Well-Known Member

    im afraid u'd get same type of dark spot on all amoled displays.
    as far as i know its not a defect unless its really large enough to see it in normal use.
     
  24. techno_techie

    techno_techie Lurker

    I did see it during normal use. I was watching Netflix in a dark room.
     

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