Image On Screen Bending When Scrolling - Nexus 7 Q&A, Help & Troubleshooting

I have a strange issue. I recently acquired a Nexus 7 in white. When I scroll, the whole image bends though. It looks like the bottom of the screen reaches the end of the animation first, followed by the top. It happens everywhere: Homescreen, Play magazines, Plume columns, etc. Instead of the entire screen moving at once, it bends into a slightly diagonal image. Anyone else have this issue? Will a custom ROM fix it? It's 100% stock unrooted.

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[Q] Ocean Waves Live Wallpaper Issue

Hi there,
Since Samsung released their latest firmware update, my live wallpaper 'ocean waves' (which I really love) keeps getting 'messed up'. The issue is that when I go into an application and come back to the home screen, the ocean wallpaper has shrunk into the middle of the screen, leaving black space filling most of the screen. Also, before the update, when you touched the 'water', it would ripple slowly and it looked great. Now when you touch it, it bounces like jelly and looks a bit 'glitchy'. It's almost like the framerate is too high now or something.
If anyone has the same problem, let me know. Also if anyone has a solution, pleeeease let me know. I really love this wallpaper!
I have the same (on JM2). Only after running specific applications the wallpaper gets messy (like bar-code scanner). For me it helps, when the wallpaper is shrunk, to run the camera app and close it again.. Not ideal obviously, but at least I don't have to reboot..

[Q] Screen stuttering when upside down

Has anyone else noticed that scrolling left and right on the home panels gets stuttery when the Xoom is upside down (landscape orientation) so that the logos are on the bottom?
does it in portrait too
I've noticed
On my Xoom, scrolling the pages in the orientation you mentioned did shutter the scrolling effect slightly, not so much that one might notice off the bat, but it can be noticed after the initial realization. It's not something I find too troublesome, however with you making me realize this, I will do some testing with some apps and see if it shutters other effects upside down.
I did not notice any shuttering in portrait mode.

What's wrong with my screen?

Ok this is kinda bugging the me to no end. Nothing is WRONG with the screen, as this only appears in certain places.
Here's what I mean: When I start up settings, or anything that darkens the background, you can see these lines: http://imgur.com/eCELgov,yPD8mMK#0 in the first image. You would also see ripples only around the jelly beans, but you can only see it in the ES Image Viewer window in the Recent Apps. But when I go back to my homescreen, the lines disappear. And this only happens with certain parts of apps or the settings, as I changed my brightness down to low as possible, and no lines or ripples.
I'm on Rastakat 4.4.2, and this is a recently bought tablet which has been working fine so far.
EDIT: This is probably a way better example: https://www.dropbox.com/s/a3r7gz5wjlwvq92/Screenshot_2014-01-01-17-30-16.png
Duskye said:
Ok this is kinda bugging the me to no end. Nothing is WRONG with the screen, as this only appears in certain places.
Here's what I mean: When I start up settings, or anything that darkens the background, you can see these lines: http://imgur.com/eCELgov,yPD8mMK#0 in the first image. You would also see ripples only around the jelly beans, but you can only see it in the ES Image Viewer window in the Recent Apps. But when I go back to my homescreen, the lines disappear. And this only happens with certain parts of apps or the settings, as I changed my brightness down to low as possible, and no lines or ripples.
I'm on Rastakat 4.4.2, and this is a recently bought tablet which has been working fine so far.
EDIT: This is probably a way better example: https://www.dropbox.com/s/a3r7gz5wjlwvq92/Screenshot_2014-01-01-17-30-16.png
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Click to collapse
Hi, Duskye...
It's always tricky judging these things from a screenshot... but it looks like you have light bleed due to screen lift on the right hand side of the screen.
I have a little light bleed myself on my Nexus 7, though nowhere near as bad as yours. I've taken the back of my Nexus 7, and I've noticed a screw is missing that should clamp the screen tightly to the frame, and thus allowing light to bleed from underneath. It's never really been a major issue for me, as it's only really noticable when the screen is really dark.
If, as you say, your device is new, I wouldn't waste time in trying to fix it yourself... you should get a refund/repair or replacement.
Also, if you have bad screen lift, the screen itself can be prone to easy cracking/shattering as it's not tightly clamped in the frame.
Screen lift/light bleed issues where a significant problem last year (I mean 2012, I forget, it's 2014 now) when the first batches of the N7 came out... but I thought those early production problems had now been ironed out.
One thing you could try... purely as diagnostic... is download from Google Playstore any one of the many testcard apps. They run the screen through a variety of coloured background's... including black... if there is no uniformity across the screen in black, then it's almost certainly screen lift. And you have a hardware problem.
And if this is the case, you should seek redress under warranty.
Good luck.
Rgrds,
Ged.
This happens on _all_ parts of the screen, it's not just that side, and, like I said, this only happens in certain parts, like say if the jellybean wallpaper had jellybeans falling from the top, I would only see those ripples _on_ the jelly beans, and the ripples move along with the jellybeans if they were in any other postion, and no where else. And I should probably mention this: This was not apparent when I had 4.1 on this. This only started happening when I installed Kitkat.
And this is probably me being uninformed, but if this a hardware problem, then how come you are able to see the problems from a screenshot it took from the device itself?
I don't think there is anything wrong with your screen. You are seeing quantization artifacts due to the "dimming". The degree to which you observe this depends on the original image.
For instance, look at your screen on Settings...Display.
All those subtle horizontal bands at the bottom of the screen are not intentional, but due to the fact that a "gradient" painted with a limited number of values will show intensity steps at each value transition, so long as your eyes can resolve that intensity difference. And this effect is always most pronounced at low intensity values.
For instance, "grey" values always have equal R,G, and B intensities, e.g.:
RGB
000 = black
111 = grey1
222 = grey2
...
254,254,254 = grey254
255,255,255 = white
So for instance the "intensity" difference between grey3 and grey4 is
I(grey3) = sqrt(3^2 + 3^2 + 3^2) = 5.196
I(grey4) = sqrt(4^2 + 4^2 + 4^2) = 6.928
(6.928 - 5.196)/5.196 * 100 = 33%
whereas the difference in observed intensity between grey240 and grey 241 is only 0.42%
You won't notice quantization effects in bright images, but you will when the same image is dim.
@Duskye Is this a live wallpaper we are talking about? There are lots of (ahem) "optimizations" that can be made (for instance sub-sampling) which sacrifice image quality for speed, so it is reasonable to believe that a software update could change things. Did you fool with any of the rendering or live wallpaper options in Settings... Developer Options?
PS Ged: When someone takes a "screenshot", they are not literally taking a picture of the screen, but dumping color values from a framebuffer. So it is not possible to capture "bleed" with a screenshot; you would have to use an actual camera for that.
Nope, that's just the regular default jellybean wallpaper, though it does this with any wallpaper.
And the only dev options I touched were USB Debugging, nothing else.
EDIT: I installed Carbon, which latest release is Jelly Bean, and the lines are not as apparent, in fact they're all gone from settings, there isn't even any ripples anymore.
EDIT2: I took a photo with Carbon as well, and made a side by side of the Rastakat and Carbon pictures: http://i.imgur.com/bk6ElGq.png
Duskye said:
Nope, that's just the regular default jellybean wallpaper, though it does this with any wallpaper.
And the only dev options I touched were USB Debugging, nothing else.
EDIT: I installed Carbon, which latest release is Jelly Bean, and the lines are not as apparent, in fact they're all gone from settings, there isn't even any ripples anymore.
EDIT2: I took a photo with Carbon as well, and made a side by side of the Rastakat and Carbon pictures: http://i.imgur.com/bk6ElGq.png
Click to expand...
Click to collapse
Well, there you have it - it's not hardware.
There are other possibilities as well - .JPG image files are partial DCTs (Discrete Cosine Transformations) on 8x8 pixel blocks. They are "partial" in the sense that compression is achieved by dropping high-frequency coefficients of the transform in each block. While all of this is standardized in the JPG format, there is no reason why a rendering method needs to compute the full image for display using all the coefficients - in the name of rendering speed. Similarly, when you "assign" the wallpaper, I believe the source file is copied to a standard location. It is possible that it is also down-sampled at that point in time, esp. if the original image was stored as a high-quality JPG image file (little to no compression).
Anyway, you get the idea - any or all of this can be affected by the ROM build.

Horizontal lines lg g2 screen

Hi I just got my new LG G2 about a week ago, but I noticed there are these small barely visible horizontal lines across the screen, but they only appear in certain applications, specially when there's text or white objects contrasting darker backgrounds, lines appear to come from the text and or objects and extend thru them like the objects are sending them sideways is very weird, immediately I thought the screen came bad but I've been thinking it could be a software issue because as I said, most of the time they are nowhere to be seen like in the lockscreen or when playing games, in those screens the display just look gorgeous and has no issues, its only in certain occasion that you can see them, has this happened to anybody else and do u have any idea on how to fix it with software? or is the display just bad and I have to return the phone? I imported it so it would be a real pain to send it back for a refund.
EDIT: apparently I cant upload images larger than 256kb WTF? the last time I took a 256kb picture was in 2005...

[Question] graphical glitch? galaxy s5 verizon 900v

Hi- this screen never appeared before and now it does -.- tried wiping factory resetting and this image wont go away from my homescreen. Idk what happened please help looked everywhere of how to remove this but no one has had this issue. This never appeared on stock until after i unlocked my bootloader and installed cm. Tried to use the repair assistant and its still there.
edit: idk why it does not show in my screenshots. here are some photos taken from my iphone... hard to show but there is a white line that is in the background of my homescreen. Shows an sms icon slightly transparent. Annoying **** to look at when I take pics on snapchat. As you can in google playstore and the snapchat photo a SMS icon appears behind the mic in play store and under the switch to facecam icon in snapchat. Does anyone know a fix??
I still have no idea what you are talking about.
Lightn1ng said:
I still have no idea what you are talking about.
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lol. ok before on my screen it will be normal fine no graphical errors no visual glitches. pictures wont show it for some reason but if you had my phone in my hand it would show up as SMS icon at the top of my screen like right below the navi bar. Shows up in camera and on my snapchat. Never happened till now. Idk if my screen got messed up or if its the constant switching of roms etc that gave me that glitch. its like a white line that separates the navibar and the rest of the screen at the bottom shows a menu bar on the left corner and some icons. its very transparent under the homescreen display like if the stock rom overlapped
like it shows a small phone screen is under the home screen. in the background- get me?
It's screen burn in. It happens with amoled screens if they are left on a static image too long. You can try some burn in fix tools in the play store. That's why you don't see it in your screen shots it's a hardware problem.
Sent from my SM-G935V using Tapatalk
xmoox said:
It's screen burn in. It happens with amoled screens if they are left on a static image too long. You can try some burn in fix tools in the play store. That's why you don't see it in your screen shots it's a hardware problem.
Sent from my SM-G935V using Tapatalk
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thank you! do you recommend any that would work?

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