Database Develop

HP touchpad screen problem

Hi Guys!
Recently I purchased a 32 gb touchpad second hand dual boot CM9 and everything was working ok. Couple of days ago I noticed a four brighter spots-around 1mm- in the left top corner. I don't know if these spots have been there at the beginning as they are hardly visible apart from white background and other light colors. What I find strange is that these spots form a perfect rhombus, kind of the one Google put on the top dev apps. Could you please help me or at least give me some idea: what these bright spots might be? Thank you very much!

Can you provide a picture?

Have you tried any of the screen test app's? Could be dead pixels...
Sent from my cm_tenderloin using xda premium

Infinite Jest said:
Can you provide a picture?
Click to expand...
Click to collapse
That is the best I can do. Sorry if the quality is no good. Although the screen appear grey it is actually white and those four bright dots are clearly visible. Thank you. I also checked for dead pixels, but I don't think this is the case. Appreciate any help!

This is a re-post of mishoni's image that he/she sent me via PM.
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I'm not really that experienced with this kind of thing, but it doesn't look like a dead or stuck pixel to me. When you press firmly on the screen, does it change at all?
EDIT: This is a response from OCN after I posted your issue and picture:
"Look like a finger print
To ID screen issues make 5 pictures. They should be pure black, pure white, pure Red, pure Green and pure blue. Use MS paint ore something and its best if the pictures are the same size as the screen and in png format (Jpegs can have artifacts). Now look at thees pictures in full screen mode. If the "smudge" looks the same regardless of color then its probably something like a nick or scratch on the screen. If shape changes depending on color it means there are damaged or jammed liquid crystals in the screen. If the crystals are just jammed they can start to work again if you run flickering video (google dead pixel repair). If its indeed stuck pixles then you can also tap the area repeatedly as a slight movement in the screen panel can get crystals moving again."
You might want to give that a shot.

Hi Infinite Jest!
I installed Dead pixel repair and Pixel fixer. I run both apps and these spots are still visible, more or less on every screen background, apart from black. I don't think it is a scratch or nick on the screen, as the shape is strange and I cant feel anything when go over it with a finger. Also, the shape never change regardless of the screen background. I would appreciate if you could re-post to OCN-I don't know what that abbreviation stand for. Thank you again!

mishoni said:
Hi Infinite Jest!
I installed Dead pixel repair and Pixel fixer. I run both apps and these spots are still visible, more or less on every screen background, apart from black. I don't think it is a scratch or nick on the screen, as the shape is strange and I cant feel anything when go over it with a finger. Also, the shape never change regardless of the screen background. I would appreciate if you could re-post to OCN-I don't know what that abbreviation stand for. Thank you again!
Click to expand...
Click to collapse
OCN=overclock.net
http://www.overclock.net/t/1291729/need-help-i-d-ing-screen-imperfection

His response:
"In that case it sounds to me like its a back light issue or to precise the backlight diffuser has a flaw in it. The diffuser is an clear plastic sheet that's painted white. It's job is to evenly reflect the light from the LED's though the LCD matrix. Unfortunately there is very little a layman can do about an damaged/flawed diffuser. I would just try to live with it but if it really bugging you then you might want to either RMA if (if you have warranty) or ring up HP support and ask about what it would potentially cos to fix it (and that's probably more then you will want to pay)."

Lines in display a normal thing?

I got a moto X a week or so ago and have notice faint lines running mostly vertically but also horizontally in the display, mostly visible in solid grays and white. I did my research and know that this is an issue with the manufacturing process of this generation of AMOLED, but I'm wondering if this will be prevalent in every single moto x or if it's just that some are worse than others (worth an exchange?)? Coming from an HTC M8 on another carrier, the fact that these solid colors look so weird with the line running through them is very disappointing (otherwise I actually like the phone better). I'll post a picture when I get a chance.

Infinite Jest said:
I got a moto X a week or so ago and have notice faint lines running mostly vertically but also horizontally in the display, mostly visible in solid grays and white. I did my research and know that this is an issue with the manufacturing process of this generation of AMOLED, but I'm wondering if this will be prevalent in every single moto x or if it's just that some are worse than others (worth an exchange?)? Coming from an HTC M8 on another carrier, the fact that these solid colors look so weird with the line running through them is very disappointing (otherwise I actually like the phone better). I'll post a picture when I get a chance.
Click to expand...
Click to collapse
That doesn't sound normal. I would replace the device asap.

I can't take a picture at the moment, but it does look similar to this:
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Infinite Jest said:
I can't take a picture at the moment, but it does look similar to this:
Click to expand...
Click to collapse
I just filled my screen with white looking for these lines and couldn't find anything. Probably a defect. Contact Motorola.

Easiest ways see it is to download the LCD test app and display full screen gray. If you don't see it, then I definitely have an issue because it looks like a textured background rather than solid color.

Infinite Jest said:
Easiest ways see it is to download the LCD test app and display full screen gray. If you don't see it, then I definitely have an issue because it looks like a textured background rather than solid color.
Click to expand...
Click to collapse
Just downloaded this app and filled the screen with gray and looked at the screen at 0, 25, 50, 75, and 100% brightness and I see no lines.

dier325 said:
Just downloaded this app and filled the screen with gray and looked at the screen at 0, 25, 50, 75, and 100% brightness and I see no lines.
Click to expand...
Click to collapse
Alright, thanks. Guess I'll be asking for a replacement.

Here are a few pics of my display for reference (hard to see on camera, but you can see cross-hatching in the lower area of the zoomed out pic and vertical lines in the close-up).
https://www.dropbox.com/s/flrs8imc35c1gps/2014-08-07 09.09.34.jpg
https://www.dropbox.com/s/ui6ucb33a27ynji/2014-08-07 09.07.06.jpg
https://www.dropbox.com/s/bnbkm672bmjt09g/2014-08-07 11.44.16.jpg

I found another forum describing it accurately as a linen-like appearance to the display rather than clear rendering. Very strange. In contact with Motorola now.

Same problem here..
EDIT: I have only oriental lines..

daede86 said:
Same problem here..
EDIT: I have only oriental lines..
Click to expand...
Click to collapse
Full Definition of ORIENTAL
1
often capitalized : of, relating to, or situated in Asia
2
a : of superior grade, luster, or value
b : being corundum or sapphire but simulating another gem in color
3
often capitalized sometimes offensive : Asian
4
capitalized : of, relating to, or constituting the biogeographic region that includes Asia south and southeast of the Himalayas and the Malay Archipelago west of Wallace's line
Click to expand...
Click to collapse
Did you mean "horizontal"?

samwathegreat said:
Did you mean "horizontal"?
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Click to collapse
Of course yes.. It was a mistaken correction of my keyboard (I was trying flesky but I'm back to SwiftKey)
But yes I have horizontal lines

daede86 said:
But yes I have horizontal lines
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Click to collapse
Absolutely normal.

devilsdouble said:
Absolutely normal.
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Click to collapse
That's annoying. I may try to get one replacement to confirm this as I can't seem to find any display models locally anymore. I didn't like the display on my GS3 when I owned that and my latest foray back into amoled has been disappointing again.

screen comparison between 128gb and 64gb, not the same?

I recently got my 128gb, and returning the 64gb tomorrow, did some comparison on the screen, 128 on the left side.
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Light bleeding on the camera at low light condition
Brighter on the 128gb(letft). Stripes are from the camera(glare)

Different display modes?

Takes a few hundred hours for the pixels to settle. In a month they both would probably look similar.

556AR said:
Different display modes?
Click to expand...
Click to collapse
This. Make sure your display mode is set to the same setting on both devices.
Light bleed does suck though. I had that on pretty much every HTC device I've owned.

556AR said:
Different display modes?
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Click to collapse
Same "Basic" display modes (as posted on the pic).

jhun80 said:
Same "Basic" display modes (as posted on the pic).
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Click to collapse
While this may sound crazy! This is normal (that there not exactly the same). While you might be able to keep comparing different S6 until you find a pair that "matches", or have the same screen brightness any random pick won't be the same...there are many factors and as simple as different build dates etc...
On the S6 now and have had every galaxy since the first one and several HTC's before. I always by in pairs (keep the wife upgraded) and have noticed this every single time and not just with the Samsung's. Just how it is.
Sent from my SM-G920T

Alright, thanks

This is 'normal'. I am on my 3rd S6 because the first two had that ugly pink tint to it. My 3rd phone not only has no pink tint, but also a really crisp white display. Compared to the previous phones, they were much more yellow.

geoldr said:
This is 'normal'. I am on my 3rd S6 because the first two had that ugly pink tint to it. My 3rd phone not only has no pink tint, but also a really crisp white display. Compared to the previous phones, they were much more yellow.
Click to expand...
Click to collapse
I'm on my 3rd as well, no pink but it does have some green at the bottom sadly. It's not too noticeable, and I don't think I want to go through the hassle of getting a 4th replacement. There's a whole thread on it here: http://forum.xda-developers.com/galaxy-s6/general/getting-replacement-s6-due-to-screen-t3074865

All the AMOLED displays for the S6 are going to have slightly different factory calibration on all profiles. So no two S6 displays are going to be the exact same.

There is no such thing as light bleed on AMOLED screens.

@rbiter said:
There is no such thing as light bleed on AMOLED screens.
Click to expand...
Click to collapse
Exactly. Basic knowledge
AMOLED does not have a backlight, it lights up each individual pixel which is why you can have inky blacks, because it simply turns off those pixels, unlike LED screens that use a black image with a light behind it giving off a grayish background.

@rbiter said:
There is no such thing as light bleed on AMOLED screens.
Click to expand...
Click to collapse
So how do you call that on the picture i posted? That only happens when i opened my camera app on total darkness. A little bit brighter on the botttom

jhun80 said:
So how do you call that on the picture i posted? That only happens when i opened my camera app on total darkness. A little bit brighter on the botttom
Click to expand...
Click to collapse
light sensor is different in the camera (more sensitive or uneven)

I noticed a change in my screen after installing a tmobile update. Originally there was a completely black screen on the lockscreen, but after the update it almost appeared that there was a sort of gradient almost representing a light bleed.

Uneven brightness/washout on display

I'm not really sure what to call this, because I've never seen it on an OLED screen before.
I have the T813 WiFi model.
Recently, I've noticed, when using sites or apps with a dark background (like XDA Labs), that my display's brightness is noticeably uneven. Holding it in landscape mode, with the home button on the right, the screen looks something like this:
Bottom left corner: normal, full dark colors
Top left and bottom right: coloring is alright, but not as good as the bottom left
Middle (vertically): noticeably brighter, sort of a strip of washed out color
Top right corner: the worst area, looks like the pixels were burned
Excluding the strip in the middle, this is a pretty even radial gradient from the bottom left.
I can't really take a picture of this, because it just won't show up. I just have to do my best to describe it. It's almost like the backlight is messed up, except that OLED doesn't use a backlight. The pixels toward the top right are just a lot brighter than the ones on the bottom left, so they look whiter or washed out. It's somewhat strange. I've seen a few burn tests of SAMOLED screens (so Samsung) and noticed they turn white when heated and tend not to restore. I do put this in a computer bag, but I don't know what could be in here that would cause enough heat near one corner to do this (the CPU is top left, which is alright in color).
Has anyone seen this before? Should I get a warranty replacement? Do I need to describe it better?

if it bother you that much, just do warranty replacement.
my friend did it for his T715, the new unit look slightly better
but of course still no 100% uniformity.

Here's how mine somewhat looks (intentionally raised brightness to better show the effect. My power button also seems to stick a bit sometimes.
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Sent from my iPhone using Tapatalk

Devhux said:
Here's how mine somewhat looks (intentionally raised brightness to better show the effect. My power button also seems to stick a bit sometimes.
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Click to collapse
That's exactly what it looks like.

Zacharee1 said:
That's exactly what it looks like.
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Click to collapse
Yeah. After further testing there's definitely something I don't like.
Using the Display Tester app in the Play Store, I set the 4-gradient test to use the same dark grey color across the screen (1A 18 1A). Results weren't pretty......
Sent from my iPhone using Tapatalk

Devhux said:
Yeah. After further testing there's definitely something I don't like.
Using the Display Tester app in the Play Store, I set the 4-gradient test to use the same dark grey color across the screen (1A 18 1A). Results weren't pretty......
Click to expand...
Click to collapse
Hmm. I'm kind of glad to see it's probably not a defect, but also kind of annoyed that it's normal. It'd be great if someone else could say if they have the problem too.

I have something like this to. Its annoying but only really visible with greys. Its relatively common with AMOLED screens, my S6 edge+ has it as well, but only very faintly.

Question Do you have rainbow effects on your Pixel 7 screen?

A user on Reddit posted that they had rainbow effects on their P7 screen when the screen was held at an angle. I did a little searching, and found that this was fairly common on the P6 screens as well. Apparently Google found that this was a normal effect and in tolerance with their manufacturing specifications.
https://www.reddit.com/r/pixel7series/comments/y3af8s
https://www.reddit.com/r/GooglePixel/comments/qo6wz7
Do you see any rainbow effects on your P7 screens?

I noticed it yesterday when the phone was about three feet away from me on the table. Maybe at a 45 degree angle it rainbows, but holding it, or being close to it, shows no signs of it. It doesn't bother me since the way I "normally" hold and use it do not produce the effect. Only if it's at a big enough angle. Even so, it is very minor. When I did see it I had to move my head back and forth to really notice it. Otherwise the screen just looks a little off color on parts of the screen. No biggie.

condor97 said:
A user on Reddit posted that they had rainbow effects on their P7 screen when the screen was held at an angle. I did a little searching, and found that this was fairly common on the P6 screens as well. Apparently Google found that this was a normal effect and in tolerance with their manufacturing specifications.
https://www.reddit.com/r/pixel7series/comments/y3af8s
https://www.reddit.com/r/GooglePixel/comments/qo6wz7
Do you see any rainbow effects on your P7 screens?
Click to expand...
Click to collapse
The phenomenon of lenses causing light to split into its component parts is called "diffraction". Any transparent medium where light travels at a different speed from the medium it came from will exhibit this phenomenon.

Mine has a slight blueish and pink tint on white at angles. I'm not sure what to do. It's not bad, I don't really notice it. I would be happy to exchange it if I knew there were some displays that didn't have this issue.

Mine has that too. But geezes, you have to be looking at the phone at an extreme angle to notice it.

Thanks for posting your experiences guys. I tried to edit the poll to reflect a vote where the issue is present but doesn't cause a problem. You should be able to change your vote. Hopefully I didn't screw things up there, and if I did, my apologies.

I notice it but the bigger issue is the green tint, just looks awful compared to my calibrated monitors.
My old S8 had a bit of a reddish tint but the colors looked better overall if a bit oversaturated. Might try to root and use Sa2ration or something.

My Pixel 6 Pro did. The Pixel 7 Pro does not.

Ok I can weigh in now. I see the exact same effect on this phone as my other oled phones. When you look at the screen at more extreme angles, you get a bluish tint to white screens. Really not an issue for me, and I don't consider it a rainbow effect (though I think it is the same thing).

On my pixel 7 I get the rainbow effect on white backgrounds when looking directly at the screen not at an angle. The screen on my Samsung a53 is much better then the screen on my pixel 7

people cant enjoy the phone for what it is...just buy the damn thing and enjoy it, its not like its noticeable if you looking at it from a normal view

I think it also depends on the kind of person you are. At work I asked 10 people and only one colleague noticed a slight shift. My iPhone XS Max back in the days also had this issue. I traded it in and got a new one, which had the same issue. I then used the phone for another 2 years and aside from the first week it didn't bothered me anymore.
They all have it. Some more than others. If you're looking for it, it's there. If you just use your phone it will disappear and just leave an excellent phone to enjoy.

Vio281 said:
people cant enjoy the phone for what it is...just buy the damn thing and enjoy it, its not like its noticeable if you looking at it from a normal view
Click to expand...
Click to collapse
i agree

Maybe a bit, but only at extreme angles. Any normal angle I'd look at my phone I can't see anything.

Guyinlaca said:
My Pixel 6 Pro did. The Pixel 7 Pro does not.
Click to expand...
Click to collapse
My p6 pro doesn't have it, even at angles and full brightness, weird

Mine has bluegreenish and redish wave-tints on angles displaying white backgrounds. But I got enough other problems in life. So ... idc

I have had three Pixel 7 (non Pro) - all of them had the same rainbow effect.
And this is quite annoying because you can not really keep 100% the same angle by reading or looking at the display while holding the smartphone in the hand. You always move a bit - and then the blue or red waves are rolling over your screen.
For me the display is one of the most important components - the display you are looking at all the time you are using the device.
But that's just my point of view...

At first I had no clue what people were talking about, but after turning the brightness to 100% and tilting the phone in an angle I'll never use (since its impossible to look at the screen since its so tilted) - then yes.
I do have the rainbow-effect on my Pixel 7.
However, its a non-issue.
I had to tilt it even more than the person in the video from OP,
but even that angle seems like a non-issue tbh.
Might as well be my protective glass for all I know.
I'll never see it unless I tilt to an unusable angle.

chopt51 said:
Mine has a slight blueish and pink tint on white at angles. I'm not sure what to do. It's not bad, I don't really notice it. I would be happy to exchange it if I knew there were some displays that didn't have this issue.
Click to expand...
Click to collapse
Upgrade to the Pixel 7 Pro since it doesn't have this issue since they didn't cheap out on the display. Seems they didn't change the screen from the Pixel 6 since XDA actually mentioned this in the review they did on the screen: "Rigid OLEDs are an older construction that is now usually only used in budget phones...Also, on rigid stacks, the refraction of the light transmitted through the glass layers causes unwanted rainbow viewing angles that you simply don't see on flexible OLEDs."
I personally find it annoying but only because I know about it now and only really noticeable if you looking at the phone at extreme angle like sitting on your desk or other flat surface. My fancy expensive larger S7+ Samsung tablet also has same issue so obviously doesn't bother enough people for them to spend more to upgrade the display to get rid of it. Also, pretty anoying that my much older LG v35 phone doesn't have this problem either since it was flexible OLED, but as you can see flexible OLED easier to break around edges, another reason I went with Pixel 7 instead of the Pixel 7 Pro.
Pixel 7 Pro: it does not have any rainbow issues.
Here's a pic I took of my S7+, iphone SE, LG V35 and Pixel 7 and can u guess which one is the Pixel? Easy to spot since only other one than the large S7 with the rainbow colors. Also, as you can see from the pic most noticeable on a clear white background so if you work or look at a lot of that like say documents at angle might be annoying enough but not to upgrade to the Pixel 7 Pro just to get rid of it. Even if you did you would still get bluish color like on the LG V35 OLED display at bottom because that's just how OLED works
Why do I see a color shift when I look at the display from an angle?​
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