M4600 IPS Screen Corner Tint

[ChrisLilley]

Originally Posted by lman123

@ChrisLilley
just to clarify Dell use lp156wf3-slb2 not lp156wf3-slb1. i am not sure of the different but i guess there shouldnt be a big different.

Thanks for the clarification, lman123. Will look for the data sheet for that one...

[hireegy]

Same for me, I am waiting restlessly for someone who would testify that yes, the IPS RGB screen can be without color defect, and if it was today in europe it would be even better!

[Gatehouse]

Originally Posted by amd1600

Does the IPS have an sRGB mode and if activated does it stop the over-saturation effect?

Thanks for the info on the IPS! No one has posted any in depth info on the IPS before and your post really helps! I'm surprised it can cover NTSC, thats pretty impressive!

For HP's Elitebook IPS solution as the example, it features two important features. First one is the STDP8028 solution from ST. and the second is the Portrait Display OEM/Licensed package for gamut mappings between sRGB and wide gamut.

[Gatehouse]

Originally Posted by ChrisLilley

I am considering a Dell M4600 with IPS panel, so I have read this thread with great interest. I note however that:

- the one person whose isue seems to be fixed has not posted further details
- some people have not had their issue fixed after multiple repairs
- no-one has posted to say that they have an M4600 with this panel and don't have the problem
- no-one has posted colorimeter measurements of the non-uniformity

So it is hard to tell if this is a systematic fault, and isolated fault, and how bad the non-uniformity is.

Reading the datasheet for what I understand is the panel used here
http://monitor.espec.ws//files/lp156wf3-slb1_546.pdf

they specify a 13-point uniformity measurement (but on luminance only, not on chromaticity) with a typical luminance change of 1.4 and a max of 1.6. That sounds low, until you read the equation used

δ WHITE = Maximum(LN1,LN2, ….. LN13) ÷ Minimum(LN1,LN2, ….. LN13)

so that is 1.4 times and 1.6 times, which is quite large.

Does anyone have measurements of the colour shift, and does anyone have an M4600 with the IPS panel that does not have this defect?

Evidently the so-called color shift is in fact caused by either A-TW Polarizer
or RGB Backlight Uniformity.

[Gatehouse]

Originally Posted by Andy_BR

Hi all,
please find below RGB panel characteristic
http://forum.notebookreview.com/atta...1&d=1320802004
So M4600 IPS Screen Corner Tint is not a issue.
I think HP's also have this phenomena,as HP use LG IPS panel too.

A-TW polarizer.

[Gatehouse]

Originally Posted by BeamerPhoto

I have the 9 cell, and do not have any secondary battery. I also have the Quadro 2000M, which is something you brought up in another post. As I suspect you already know by now, the IPS screen cannot be used with Optimus, so it is the Quadro all the time. So far the longest I've had it unplugged is 30 - 45 minutes, so I can't say much about the battery life. I'm plugged in 99% of the time. I'll try to do a runtime test for you when I get a chance.

As for the color gamut, it is great. According to my Spyder 3, it meets AdobeRGB and NTSC. This screen (with it's defects) has a native white point of 7800 K if I remember correctly, though I'm not sure if the replacement will be the same in that regard. With the full NTSC gamut, you'll be in good shape for just about anything except some vivid spot colors. Some have complained about it being too saturated, but that's what you get IPS for! It is true, though, out of the box the colors on everything from icons to pictures can make your eyes bleed. After profiling the monitor, things calm down of course.

Buy new spectrometer (such as Colormunki Photo) and send your Colorimeter for the bin nearby.

[Gatehouse]

Originally Posted by hireegy

Same for me, I am waiting restlessly for someone who would testify that yes, the IPS RGB screen can be without color defect, and if it was today in europe it would be even better!

Screen Corner Tint exchanges for IPS Glow/Better White Balance.

HP 2475w (R) LCD Glow vs NEC 2490 (L) Test3 - YouTube

[xenon_cao]

i checked the IPS panel used on my m4600, and it has slightly light leakage like my Dell U2412M monitor which equipped with an e-IPS panel. perhaps color tint existed but frankly speaking i can hardly notice that.
btw i‘m still curious about M6600's IPS panel bcz the IPS panel cannot be chosen account of microphone's incompatibility in both US and China.......

[M-Z]

Originally Posted by xenon_cao

i checked the IPS panel used on my m4600, and it has slightly light leakage like my Dell U2412M monitor which equipped with an e-IPS panel. perhaps color tint existed but frankly speaking i can hardly notice that.

How big is your "leakage", because if it was minor I would let it go myself, but mine is about 5 cm high and 1 to 2 cm wide. That is not hardly noticable.
And is it green in left bottom corner or magenta/pink in right bottom one?

[Gatehouse]

Originally Posted by xenon_cao

i checked the IPS panel used on my m4600, and it has slightly light leakage like my Dell U2412M monitor which equipped with an e-IPS panel. perhaps color tint existed but frankly speaking i can hardly notice that.
btw i‘m still curious about M6600's IPS panel bcz the IPS panel cannot be chosen account of microphone's incompatibility in both US and China.......

Only High End monitor(EIZO/NEC for 600-1000 USD in USA or 10000 RMB in China due to tax) supports RGB Panel Uniformity Automation.