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Hi guys!
I'd like ask all of you how often is this problem in Hero series?
I bought one a month ago and it has some stucked pixels, but I heard that the chance of getting even worse phone is bigger, so I decided to keep this one, because these dots are practically invisible during the common work with the phone.
I can see one or two if I set the brightness level to full, but thats my second question- how many of you use brightness on full or you do prefere to keep it on automatic? I discovered that on manual setting the phone loses light sensor function, am I right?
A couple of dead pixels here too... But can only really see them when I boot, so it's ok. So far...
p.s. I use half of the brightness. Full brightness i s great to show off but sucks up too much battery!!!
A few can been on boot on my phone too. Not really a big deal though.
From all opinions I got (plus from the other forums)- here is the statistics:
38 people don't have any/ 34 do have this issue...
Not good for HTC...
Hardly an exhaustive sample! Plus, you're more likely to get "positives" based on the thread title, because it's far more likely that people with dead pixels will read it!
That being said, it is *very* common, and not just on the Hero. You don't need to google for long to find that the iPhone has similar issues.
Regards,
Dave
Yes, you are right, but still.. even those people with this problem are enough evidence that it's something wrong with the quality control. I am not saying that it's happened only to HTC Hero, but it's a big problem in general and I don't agree to give 400+ boxes for getting stucked/dead/bright and so on pixels. This is just kind of thinking, and when the manufactures realize that it would be much painless for us- the clients. It's all about the quality control- in general- monitors, TV's, cameras, laptops...esspecially when the items go above define price. You get it what I mean..there is no room for joking with the clients. Ok, I am gonna change the device- once, twice, three times, but where goes the starting point that has made me convince to buy exactly this model? Nowhere..the same with Iphone, Sony Ericsson, Nokia... We are living in 21st century and the perfection is tide connected with this time..or at least that's my point of view...
The issue is that the yield of 100% "perfect" LCD displays is actually quite low. As this article states (under Quality Control) it is economically prohibitive to throw away otherwise perfectly good LCD panels for the sake of a few dead pixels.
Unfortunately, as it currently stands with LCD manufacturing methods, for us all to be *guaranteed* screens free of any dead pixels, we'd probably have to pay an awful lot more for our devices since many screens would end up having to be thrown away.
Regards,
Dave
Ive got none however I do have a little light leak in the top right of the display
I have 2. But I dont think they're dead pixels but dust that's visible on the black background with booting. Cannot see them at all with normal use.
If they were completely dead pixels it might have been more nasty.
It's in the nature of fabricating lcd displays. And has been a problem for a long time. Anyway, with my Hero I can't be bothered about it.
If you have stuck pixels, try JScreenFix. Its free from the Market. worked for me!
i had alot on my first device.. i traded it in.. this one has 2.. they only show up during booting.. so i guess its not a big deal
I've had a couple of Heros by now:
1. very visible dead pixel (centered in market search field) -> returned
2. Really large gap on top side of display glass -> returned
3. happy until after 3 months suddenly loads of dust appeared below display glass -> returned
4. dead pixel in prominent place -> returned
5. I'm very happy again. hope that dust will stay away from underneath the display glass.
So, my personal record so far: 4/5 Heros are flawed (3/5 Heros on arrival).
That's really sad as it is such a great phone otherwise.
I've posted about this before, if they appear as bright white specks when brightness is up full (such as during the boot animation) then it's dust, not dead or stuck pixels. You can open the phone up and remove them. I've seen it on multiple handsets, turned out to be dust every time.
Switchbitch said:
I've posted about this before, if they appear as bright white specks when brightness is up full (such as during the boot animation) then it's dust, not dead or stuck pixels. You can open the phone up and remove them. I've seen it on multiple handsets, turned out to be dust every time.
Click to expand...
Click to collapse
In my case the first pixel was permanently green, while it was a red pixel in the second case, definately not dust. (I think these are correctly called hot pixels, not dead ones.)
i hab a dead pixel on the first day after i bought it. But i went to the T-Mobile shop immediatly and they changed my hero with a new one without any problems! With my "second" Hero i dont have any Problems till now. Seems like there are 2 generations of displays!
*edit*
my dead pixel was near the upper left corner and it was totally white. actually you could only see it if the rest of the screen was red or black. but as it was a mistake i changed my hero anyway!
My screen is littered with white stuck pixels. Best visible with an all black image and 100% brightness. I don't know if they were there from the start. I guess I was too excited with the HD2 to even notice them at first.
Now I have at least 7 of these stuck pixels and 2 of them are only 2mm apart.
I can't find the policy regarding dead/stuck pixels anywhere. Not on the HTC site (I live in the Netherlands, Europe) nor here on the Leo forums or even trying google.
Does anyone know the dead/stuck pixel policy HTC has in Europe?
I bought the device on december 12th.
It would also be nice to use this thread to find out if more people are having this problem with the HD2.
Thanks!
EDIT: Added a poll. It might be nice to know how many of you are suffering from dead pixels to get an idea of the quality of the HD2 LCD screens used.
ralphfx said:
My screen is littered with white stuck pixels. Best visible with an all black image and 100% brightness. I don't know if they were there from the start. I guess I was too excited with the HD2 to even notice them at first.
Now I have at least 7 of these stuck pixels and 2 of them are only 2mm apart.
I can't find the policy regarding dead/stuck pixels anywhere. Not on the HTC site (I live in the Netherlands, Europe) nor here on the Leo forums or even trying google.
Does anyone know the dead/stuck pixel policy HTC has in Europe?
I bought the device on december 12th.
It would also be nice to use this thread to find out if more people are having this problem with the HD2.
Thanks!
Click to expand...
Click to collapse
From what I've read in another thread, someone spoke to HTC when they had 1 dead pixel and HTC said they'd need 10 before it was a warranty issue. Personally, I think it should be an issue if there's any dead pixels, especially when the thing is only a month old!
Get in touch with them and see what they say themselves.
I'm waiting for an answer from HTC. They are not that fast..
I also read that thread, but to be honest I've never heard of so many pixels needed to be dead to be covered by warranty.
The title of that thread states only 1 dead pixel (which is normally not covered by warranty), so I thought it would be a good idea to open a new one and check out the experience of other xda users.
Found this for the Asia Warranty, and it states on page 4 of this document, http://docs.google.com/viewer?a=v&q...&gl=uk&sig=AHIEtbQJk8yP96b-ddibr9YKV3EYPCjKXg
14. Due to the complexity of liquid crystal displays on handheld devices, dead or bright pixels
may sometimes occur. If the following occurs within 14 days from the date of purchase, then
you can ask to replace the LCD at our authorized service centre.
(a) 3 or more dead/bright pixels (*) anywhere on the liquid crystal display.
(b) If there are only 2 dead/bright pixels, then they must be within 5mm of each other.
(c) However if the conditions listed below occur, then this warranty is null and void.
(*) ”Dead pixel” – a pixel on the liquid crystal display (LCD) that shows no light at even
when it is supposed to.
(*) “Bright pixel” – a pixel on the LCD that shows only 1 color (usually white) and no other
colors at all.
What (C) refers to I don't know.... the 2 conditions below are knackered pixels! Give them a ring - on laptops it was 6 or 7 accross the screen, or 3 or 4 towards the centre. I wouldn't tolerate that many on something like a phone, as you're looking at the entire screen all the time.
Good luck
Again a different answer. I hope HTC replies soon.. Someone on tweakers.net told me they look at a % of dead pixels. I think I will give HTC a ring tomorrow instead of waiting for an e-mail.
Wow. I had four of these, the last one I sold still sealed in its box but the other three were perfect with regard to not having dead pixels. How unlucky! If I were you I'd return it for one of the numerous other faults, never mind their dead pixel policy. Say the SMS fault is the issue, or the crackling call quality (if you have it) etc.
Those faults are something to try indeed if they reject the pixel claim.. However the sms issue can probably be fixed with a hotfix.. Can't say anything yet about crackling call audio, didn't use it to call yet. Still playing with it and awaiting my soft resin case + screenprotector
I just noticed another white pixel.. So that is a total of 8 already.. Seems like they are all suddenly appearing (not that I'm paranoid, but I didn't notice any white stuck pixels before and I would swear there were "only" 3 yesterday morning when I first noticed..)
Ok, I gave HTC Netherlands a ring and here is what they said:
There need to be at least 4 dead/hot/stuck pixels present, OR
There need to be 2 dead/hot/stuck pixels at a maximum distance of 5mm from each other
So I brought my HD2 to back to the store I bought it from and they have sent it in for repair/exchange. I don't know if they will replace the screen or the complete handset, but I pushed them quite a bit to replace the entire handset (it's only a month old and I don't like the idea of it being taken apart already :S) I'll keep you all informed.
Good to know.... hope yours comes back fine!
Are you sure you are not seeing the touch screen matrix?
firaX said:
Are you sure you are not seeing the touch screen matrix?
Click to expand...
Click to collapse
I think from his description we're all sure that he's not seeing the "touch screen matrix"
Towserspvm2000 said:
Good to know.... hope yours comes back fine!
Click to expand...
Click to collapse
Thank you! I hope so too! Good thing is that they (the store) also filled "in perfect condition" in on the RMA form. Sent back a Nokia once and it came back all scratched up and I couldn't fall back on anything to prove it wasn't scratched when I sent it in.
firaX said:
Are you sure you are not seeing the touch screen matrix?
Click to expand...
Click to collapse
No it is not the matrix!
johncmolyneux said:
I think from his description we're all sure that he's not seeing the "touch screen matrix"
Click to expand...
Click to collapse
Indeed
I have a UK Tmobile HD2 Ive only had it 2 weeks and had noticed a white pixel appear a couple of days ago and now I have spotted 2 more (bottom left, middle and top right of the screen) and I can also just about see 3 not very visible RED stuck pixels.
I will be taking the handset back in to the store tomorrow to see what they plan to do about it, they will probably send it off for repair but i will ask for an exchange although the store does not have any instock.
my HD2 suffers from a dead pixel too.
Luckily it's only 1 (and i hope it won't get any more).
I have my HD2 a week, and yesterday i first noticed the dead pixel with brightness on 100% and a white background.
Hope they do something about your situation, because that many dead/hot/stuck pixels isn't fun anymore, and the worst part is you can't hold your eyes of it once you noticed them.
Is there a software to fix stuck pixels??? I have spotted a red point which can be seen only in some applications with black background. But it isn't seen in a totally black picture.
ralphfx said:
My screen is littered with white stuck pixels. Best visible with an all black image and 100% brightness. I don't know if they were there from the start. I guess I was too excited with the HD2 to even notice them at first.
Now I have at least 7 of these stuck pixels and 2 of them are only 2mm apart.
I can't find the policy regarding dead/stuck pixels anywhere. Not on the HTC site (I live in the Netherlands, Europe) nor here on the Leo forums or even trying google.
Does anyone know the dead/stuck pixel policy HTC has in Europe?
I bought the device on december 12th.
It would also be nice to use this thread to find out if more people are having this problem with the HD2.
Thanks!
EDIT: Added a poll. It might be nice to know how many of you are suffering from dead pixels to get an idea of the quality of the HD2 LCD screens used.
Click to expand...
Click to collapse
Any update on this?
i live in NL and curious to hear if its fixed for free.
Black dead pixels?
Are dead pixels black or white? I have few in a small area after I bought it used a year ago. They haven't spread but does anyone else have this problem?
i am on it too .... a blue pixel only on black font.....
Hello, i'm sorry for create duplicate thread from http://forum.xda-developers.com/showthread.php?t=1093995 because i did't get any answer, so i decided to open new thread at this subforum, because many ppl look at it
few weeks ago [3 may 2011] i bought a new desire HD
and today, i realized there's a stuck pixel at the top right panel near the clock, the panel gray and the stuck pixel just colour almost same, take time and focus to realize it.
i create a new thread because all other threads of the stuck pixel didn't give me any solution
and this stuck pixel not just stuck in 1 colour
but,
when the screen is white, the pixel is red
when screen blue, its blue [dissapear]
when screen light purple, its light purple
when screen black, its black
when screen green, its blue
idk if the pixel really gone when its blue or purple, but my eyes are normal i guess..
JscreenFix tested, 1 hour, no work
tapping, scrubing, massage method, no work
is there any other method that you recommend?
i didn't root the phone yet because it still in Warranty, and i guess if i bring it to HTC Care, i won't get a new unit, but a new lcd, and the mechanic sure open the phone and broke the void sticker..
any suggestion?
If you have tried all the above I would phone HTC and try and get it replaced...
Good luck as some people have problems replacing phones with dead/stuck pixels as they are allowed a certain percentage of dead/stuck before its deemed a fault
Devilsduck said:
If you have tried all the above I would phone HTC and try and get it replaced...
Good luck as some people have problems replacing phones with dead/stuck pixels as they are allowed a certain percentage of dead/stuck before its deemed a fault
Click to expand...
Click to collapse
The HTC didn't want to replace it, but i contact the shop where i buy and ask them for replacement, but still is there any other method that someone had test it and work?
I'm not suggesting this, do it at your own risk, don't blame me if you brake anything!!!
There is a way of "unstucking" the pixel by pressing hard on your screen(so I've heard, never had a dead pixel in my life=>never tried it). It looks like that your pixel isn't actually "dead"(it would only shine in one color(white) or wouldn't shine(black) if it was), but rather "stuck"(again, so I've heard, and didn't do any research about it, how and why is this happening, so there's a big chance I'm wrong).
If they won't replace your phone, and you don't really want to try exotic stuff that might break your phone(like pressing hard on the screen/dissassembling the phone and poking the screen from behind with the screwdriver/yelling loud at it), there isn't really anything that you can do about it, except get used to it...
I've had a stuck pixel on my Desire HD since 4 days after i purchased it, which was at the beginning of December. At the time, i tried everything i could to fix it but nothing worked. So now i just learned to live with it.
Btw, i really recommend to not try push/massage on the screen because the glass on the DHD does not flex. If you apply enough pressure you could shatter the glass (considering it's not gorilla glass).
So if JScreenFix doesnt do anything then im afraid nothing can really be done, unless you decide to disassemble the phone yourself (i dont recommend), or brake your phone purposely so HTC will replace it
Devilsduck said:
If you have tried all the above I would phone HTC and try and get it replaced...
Good luck as some people have problems replacing phones with dead/stuck pixels as they are allowed a certain percentage of dead/stuck before its deemed a fault
Click to expand...
Click to collapse
It takes 3 dead pixels to replace it with a new one, here were I live. I have one on my DHD, but it's in the down right corner, can't even see it, noticed it by accident when i was watching a video that was cropped so it had alot of black around it.
Otherwise, don't see it-don't care
I've even had a dead pixel on my Philips monitor, for 1 year, and then it just dissapeared. And it was a red ugly one, right in the middle of the screen, very annoying.
I've had a stuck pixel for some time now. It's bright red and in the middle of the screen, i just lived it. I barely notice it. Only when i look for it do i find it. I'm tempted to say 2.3 fixed the problem for me but it could just be that i changed my wallpaper from the live sense one to a black one.
So i recieved my Galaxy s2 the other day, as a replacement for my HTC HD2 which was in for a repair with a broken screen - apparently it was 'unecconomical' to repair - but i certainly wasnt complaining!
Awesome phone, had it for two days, rooted it fine using Odin and superoneclick - fantastic tool..
After rooting i re-flashed with stock kernel again.
All was absolutely fine, i was using my phone without problems until a few hours later (yesterday evening) when after putting it down for five minutes and picking it up again, there was a pixel wide horizontal line running across the screen.
They are not dead or stuck pixels, as they change colour with the background- they just appear extremely brightly, so stand out from the rest of the display.
No amount of adjusting has resolved this, rebooting/hard reset etc. the line remains prominently running from the right side, and slowly fading to the left.
Ive searched online but cant see any issues with screens like this, just dead pixel lines and stuck pixels.
If anyone may have an idea on whether this could be software related problem or hardware related would be great to know your thoughts.
Cheers, Alex
I would be taking it straight back . I got a couple of sgs2 handsets back in may when they were 1st released and i had numerous screen issues. i got one a few days ago an my friend got one yesterday and the screens are pretty much bang on (tiny tiny yellow tint if you go looking for it)
No lines , no dead pixels , beautifull screens even with the slight yellow tint
I hated my 1st screens so there are defo some bad ones knocking about and some that are literally 10x nicer to look at
Like i say take it back buddy
Good luck with it and let us know how you got on
Also pictures of the problem could be interesting
Yep I definitely will...
Just whether to un-root and reset flash count first or not - probs a good idea im thinking.
Aside from that i agree its a lovely display- ive heard about the yellow tint but noticed it on mine.
Will try and get a pic up before it goes back..
Cheers for the input!
Hello,
I have received Google Nexus 10 and it seems like the seal was broken, which suggests that somebody else has already used it (or at least unpacked).
I guess that the only known "big issue" is the light bleed. Could somebody tell me, step by step, how to determine it? (e.g. how to load all black screen? What brightness should I use to check it?). I am trying to judge whether to keep the tablet or not.
Thank you for help,
Theriel
Try using an app like this LCD test:
https://play.google.com/store/apps/...DEsImRlLmxhcHBlLnRpbS5hbmRyb2lkLmxjZHRlc3QiXQ..
go to the pure black and then play around with the brightness (set it to max).
You'll almost certainly going to see some but this should help you decide if it's a deal breaker for you.
the darker the room the better aswell! if you are in a pitch dark room and only see little light bleed at max brightness then have a little smile to yourself and enjoy the nexus!
theriel said:
Hello,
I have received Google Nexus 10 and it seems like the seal was broken, which suggests that somebody else has already used it (or at least unpacked).
I guess that the only known "big issue" is the light bleed. Could somebody tell me, step by step, how to determine it? (e.g. how to load all black screen? What brightness should I use to check it?). I am trying to judge whether to keep the tablet or not.
Thank you for help,
Theriel
Click to expand...
Click to collapse
Check out "Backlight Bleed Test"
https://play.google.com/store/apps/details?id=com.joeleveque.backlightbleedtest
Sent from my Nexus 10 using Tapatalk HD
So what is light bleed that matters?
I know the OP's question is on testing for bleed, but want to respond to help those wondering whether what they're seeing in their tests is normal or a defect that a replacement unit might solve . . .
Starting with a couple of suggested definitions:
'Light bleed' is a significant unevenness in screen lighting/brightness that's irritating in normal use – like scalloping along the edges, or being a lot brighter or darker on one side. Separately, let's call it 'black glow' when what's intended to be jet black on a screen doesn't appear completely black.
If you search the Web for 'light bleed' and the name of any major tablet, you'll find plenty of references to this. When examining your tablet, for context do the same with your laptop, LCD monitor, and LCD TV, for all are subject to the same concerns. No screen technology is perfect. Lighting on all LCD screens varies somewhat depending on the angle you look at it, and some level of 'black glow' is normal too.
Looking at your all-black screen in a dark room with the brightness turned up can be a useful test to verify problems if you find concerns that affect normal usage. This is a worst-case-scenario video test, and when you test your other LCD-screen devices this way, you are bound to see 'black glow'.
A lot of cell phones (mostly Samsung) have AMOLED screens that don't need screen backlighting & thus don't have 'black glow' – each pixel is a light and blacks can truly be black. But these screens are limited to smaller devices – the largest are two lower-resolution 7.7" units; you can't buy a 10" AMOLED tablet. With LCD's, note that the larger the screen & the higher the resolution, the brighter the backlight (really, it's on the edge) needs to be.
There are definitely defective units out there, and some that aren't as even as others. Hopefully this adds context to the discussion and will help folks new to the issue decide whether their unit is bad enough to be worth exchanging . . .
brocco99 said:
I know the OP's question is on testing for bleed, but want to respond to help those wondering whether what they're seeing in their tests is normal or a defect that a replacement unit might solve . . .
Starting with a couple of suggested definitions:
'Light bleed' is a significant unevenness in screen lighting/brightness that's irritating in normal use – like scalloping along the edges, or being a lot brighter or darker on one side. Separately, let's call it 'black glow' when what's intended to be jet black on a screen doesn't appear completely black.
If you search the Web for 'light bleed' and the name of any major tablet, you'll find plenty of references to this. When examining your tablet, for context do the same with your laptop, LCD monitor, and LCD TV, for all are subject to the same concerns. No screen technology is perfect. Lighting on all LCD screens varies somewhat depending on the angle you look at it, and some level of 'black glow' is normal too.
Looking at your all-black screen in a dark room with the brightness turned up can be a useful test to verify problems if you find concerns that affect normal usage. This is a worst-case-scenario video test, and when you test your other LCD-screen devices this way, you are bound to see 'black glow'.
A lot of cell phones (mostly Samsung) have AMOLED screens that don't need screen backlighting & thus don't have 'black glow' – each pixel is a light and blacks can truly be black. But these screens are limited to smaller devices – the largest are two lower-resolution 7.7" units; you can't buy a 10" AMOLED tablet. With LCD's, note that the larger the screen & the higher the resolution, the brighter the backlight (really, it's on the edge) needs to be.
There are definitely defective units out there, and some that aren't as even as others. Hopefully this adds context to the discussion and will help folks new to the issue decide whether their unit is bad enough to be worth exchanging . . .
Click to expand...
Click to collapse
Mine is faintly noticeable all the time with auto brightness on. I asked for an RMA and it was 2-3 times as bad. I think I will keep this one. As of now looking at it really bothers me, but I know in a few months once this device has some wear it won't matter to me. However I am still debating on attempting to receive a refund and possibly buying it in the stores in a few months. Hmmm lol.
Thank you all for your informative responses.
I am attaching the pictures of my case. I guess I will have to return it - although you cannot see in the light and with non-black background, it is pretty annoying when the background is black and the ambient light is a bit dimmer...
What would you do in my case ? How does this case compare to your cases?
Thank you,
Theriel
my orignal device has servere light bleed on the left corner and my replacement device has servere light bleed on the right corner... 3rd one is on the way, please Google, give me a acceptable screen before the world ends!!
I do not think there is any point of returning it. It seems liek light bleed is inherent in the design of these tablets. I have two right in front of me, the second one has even worse light bleed. I shall be keeping the first one. Does any one know if they will charge my card for the second one. It seems like they charged me card, then a days before I got a second nexus 10, they removed the charged.
I was expecting a courier to pick up my old nexus 10. But no one has. Any one else in the same situation with 2 nexus 10s?
sharp910sh said:
I do not think there is any point of returning it. It seems liek light bleed is inherent in the design of these tablets. I have two right in front of me, the second one has even worse light bleed. I shall be keeping the first one. Does any one know if they will charge my card for the second one. It seems like they charged me card, then a days before I got a second nexus 10, they removed the charged.
I was expecting a courier to pick up my old nexus 10. But no one has. Any one else in the same situation with 2 nexus 10s?
Click to expand...
Click to collapse
You know its bad when its a best of the worst scenario. Lol.
sharp910sh said:
I do not think there is any point of returning it. It seems liek light bleed is inherent in the design of these tablets. I have two right in front of me, the second one has even worse light bleed. I shall be keeping the first one. Does any one know if they will charge my card for the second one. It seems like they charged me card, then a days before I got a second nexus 10, they removed the charged.
I was expecting a courier to pick up my old nexus 10. But no one has. Any one else in the same situation with 2 nexus 10s?
Click to expand...
Click to collapse
They will place another hold of the price of the device until the rma'd unit has returned to them. It would take another 7 days until the hold is released from what was explained to me. So at the moment for me they have 1k of my money on hold because the original is in route to them now and I had just ordered the replacement for the replacement!
You will have to setup a pickup or go to the nearest UPS facility to return your defective unit.
Sent from my Nexus 10 using Tapatalk HD
jjdevega said:
They will place another hold of the price of the device until the rma'd unit has returned to them. It would take another 7 days until the hold is released from what was explained to me. So at the moment for me they have 1k of my money on hold because the original is in route to them now and I had just ordered the replacement for the replacement!
You will have to setup a pickup or go to the nearest UPS facility to return your defective unit.
Sent from my Nexus 10 using Tapatalk HD
Click to expand...
Click to collapse
Yes, I was thinking that. But they do not have any of my money on hold. They did but then it was returned back?! Keep checking my account. I thought they were going to organise the collection of my old devise. Seems like i shall give them a ring. They may charge my card again!
So... what do you think about my case (see photos in the previous post)? How does it compare to the "average Nexus 10" you have/have seen? Is it "ok" or "one of the worst cases" or... ?
I am not sure if it is not worth waiting 2-3 weeks for a new tablet, as opposed to holding onto a defective one for a few years...
theriel said:
So... what do you think about my case (see photos in the previous post)? How does it compare to the "average Nexus 10" you have/have seen? Is it "ok" or "one of the worst cases" or... ?
I am not sure if it is not worth waiting 2-3 weeks for a new tablet, as opposed to holding onto a defective one for a few years...
Click to expand...
Click to collapse
Your one looks bad!
@OP: It seems the question should be whether your screen looks great to you in normal use or not. If lighting evenness irritates under normal use, *then* the dark room/full-black screen test can confirm what you're seeing. Is only time you see a funny pattern when testing the thing this way?
We can't really know if a picture taken with a typical camera in a dark room really reflects how you see the image; most cameras normally crank the gain up 'till there's some kind of funny colored image. My screen is a bit brighter in the lower right when running this test -- which I see as nothing more than an interesting detail about how the backlighting works, it's completely irrelevant to me in normal use. If your picture really does reflect what you experience, and it affects normal usage . . . yep, it's worse than mine.
The easiest way you can get context for what you're seeing is probably to run the same test on any laptop or tablet you can get ahold of -- makes sense that you don't want your tablet to come up short when compared to what you see first-hand on other LCD screens. That's probably a lot better way to decide!