[Galaxy Note 4 General] TML1504:
After seeing a lot more of Note4 devices I'm now finally sure that on Note4 the displays vary a lot. "Perfect screens" are very rare, the best one

I've seen so far was on display in a "MediaMarkt" Store in VIenna. It was a display unit (without radio module), but the screen was a lot better then

on my current Note4. White was much more stable when tilting the device...

Today I had the idea of writing to "DisplayMate", because they tested a lot of Samsung AMOLED devices and their reviews always praise this screens

very much. Would be interesting what they would say to our issues:

Here is the mail I wrote them:

Von: TML1504

Gesendet: Sonntag, 02. November 2014 22:25

An: 'info.dm@displaymate.com'

Betreff: Samsung Note4 Display Quality (XDA)

Wichtigkeit: Hoch

Dear ladies and gentlemen,

I’m writing to you because you compare and evaluate display devices and rate their screens.

I know your evaluations since years, and I like your scientific approach.

Let me give you a short description of myself:

I’m a consumer electronics freak with a plethora of devices, mostly from Samsung (I do not like

Apples overestimated marketing crap) and I’m especially a freak when it comes to displays. I

owned several AMOLED devices so far (Galaxy S1, S2, S3, Note1-4, Tab7-7, Tab-S(both)) and with

ALL of them I have to exchange them 2-8 (!) times to get one with a decent screen. Trust me, the

devices you get are cherry-picked from Samsung, or if you bought them randomly you must have

been VERY lucky!

I’ve a MSc in engineering and I hold product development lectures at university, so I know what

I’m talking about tech und manufacturing. Believe me, Samsung has big issues when it comes to

display quality. Their luck is that most people do not compare identical devices, therefore most

people would think their screen is ok and not bother.

So, what is the problem:

As you can see here on XDA developers:

http://xdaforums.com/note-4/help/2-white-tones-screen-t2926527

http://xdaforums.com/note-4/general/colour-tint-screen-t2909552

There are some threads in regard to this problem, as well as pictures.

I for myself created one huge thread for Note4:http://xdaforums.com/note-4/general/note4-amoled-screen-quality-t2906365

And for Note3 as well: http://xdaforums.com/showthread.php?t=2463786

If you search you would find a lot of other threads in regard to Samsung’s AMOLED screens.

In short: The displays of otherwise identical units differ A LOT in terms of display quality. If you

buy 10 Note4 devices you will get perhaps 1-2 with a perfect screen, all other devices would

suffer from bad viewing angles (HUGE discoloration when tilting), uneven brightness distribution

(yellow corners, especially right side of the screen and lower half), or very different white tone

when straight viewing on. I did this since note2 this way: Purchase a few devices, select the one

with the best screen and return the others.

I think this has mainly two manufacturing reasons:

1)	The panels are cut out of a wafer. Screens from the center of the wafer are perfect, screens

from the side regions suffer from uneven color and/or brightness distribution depending from

where of the wafer they have been cut

2)	Uneven or otherwise not proper coating of the screen. A too thick layer perhaps could cause color

problems.

Nevertheless, what bothers me a little bit is that you do not mention any of this in your reviews, and

people think they have a perfect screen. It would be nice if you response to this issues and at least tell

us what your opinion about the reason for such huge quality issues is.

I will post this mail also on XDA, if you want to you can reply directly there.

Thank you for your otherwise brilliant work!

Best regards,

Markus