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tog84
Paper Tape
Posts: 7
Registered: ‎12-03-2019
Location: AU
Views: 560
Message 31 of 101

Re: P1 Gen 2 - Small dots on OLED screen

Yep the Dell Oled looks great. Lenovo obviously went for the cheaper option....

Guru
Posts: 2,148
Registered: ‎04-20-2008
Location: US
Views: 482
Message 32 of 101

Re: P1 Gen 2 - Small dots on OLED screen

Excellent analysis!!!


P53 XEON 2276 BIOS 1.19 OLED UHD 4K Multi-touch display, 96GB RAM, RTX5000, RAID 1, 1TB x 2 Samsung PM981, 1TB PM981, WWAN
P70 XEON 1505, BIOS 2.32, 4k Display, 64GB, M3000M NVIDIA GPU, RAID1 1TB Samsung PM981 PCIe-NVMe SSD x 2, 2x Samsung 850 Pro 1TB SSD. EM7455 WWAN
P1. BIOS 1.25,Xeon Processor, 4k UHD IPS multi-touch display, 32GB, PM981 1TB x 2, RAID1

I am not an employee nor an agent of Lenovo.
Guru
Posts: 2,148
Registered: ‎04-20-2008
Location: US
Views: 474
Message 33 of 101

Re: P1 Gen 2 - Small dots on OLED screen

Which series do you believe does not have this defect? All of the OLED panels for Lenovo 15.6" are the same p/n. Did you mean another manufacturer??


P53 XEON 2276 BIOS 1.19 OLED UHD 4K Multi-touch display, 96GB RAM, RTX5000, RAID 1, 1TB x 2 Samsung PM981, 1TB PM981, WWAN
P70 XEON 1505, BIOS 2.32, 4k Display, 64GB, M3000M NVIDIA GPU, RAID1 1TB Samsung PM981 PCIe-NVMe SSD x 2, 2x Samsung 850 Pro 1TB SSD. EM7455 WWAN
P1. BIOS 1.25,Xeon Processor, 4k UHD IPS multi-touch display, 32GB, PM981 1TB x 2, RAID1

I am not an employee nor an agent of Lenovo.
camille21
Fanfold Paper
Posts: 6
Registered: ‎11-05-2019
Location: FR
Views: 459
Message 34 of 101

Re: P1 Gen 2 - Small dots on OLED screen


@harrisb wrote:

Which series do you believe does not have this defect? All of the OLED panels for Lenovo 15.6" are the same p/n. Did you mean another manufacturer??


It's just a guess, but since not every owner of the P1 Gen 2/P53 OLED experience this issue, or maybe not at the same level (e.g. you mentioned that you can see the effect only if you pay attention, while on my screen it is very visible) maybe not all screens are from the same production line despite having the same p/n, and that some may have a different touch layer. Or maybe it comes from a difference of transparency of that touch grid that increases or lessens the issue, idk.

camille21
Fanfold Paper
Posts: 6
Registered: ‎11-05-2019
Location: FR
Views: 441
Message 35 of 101

Re: P1 Gen 2 - Small dots on OLED screen

I don't know why, but my original post disapeared... Fortunately I had it saved locally.

 

Moderator note: it was snagged by the spam filter - which gets overly cranky at times.  Since you've recovered nicely, I'll leave that earlier version archived.

-----------------------------------------------------------------------------------

 

Hi all,

 

I did a little experiment to confirm my thoughts: that the issue comes from the interference between the pixel arrangement and the touch layer grid.

 

Below is the picture of the pixels of the OLED panel provided by Andy_Lenovo where I highlighted the diagonal arrangement of the pixels.

 

pixels.PNG

 

 

If we zoom out we end up with a more a less orthogonal grid like this (this is about 100 pixels wide):

grid.png

 

 

The touch layer grid doesn't have the exact same shape, if you look closely, you'll see that it is flattened (i.e. the diamonds are more wide than tall), like this:

 

grid2.png

 

 

Now, guess what happens if we stack both grids upon each other?

 

grid3.png

 

You can see the interference pattern appearing:

 

grid3.png

 

I don't have the exact size and shape of neither the pixels nor the touch grid but you get the idea: if you stack two grids with different intersection angles, interference artefacts appear. This looks exactly like the "fabric" or mesh pattern that repeats all over my screen. You can see that it is at a much higher scale than subpixels. And we can decrease brightness, it won't go away.

 

So we have a high end laptop with a wonderful OLED panel, but for some obscure reason someone decided to slap a touch layer on top (that BTW hardly no one really needs, this is a laptop not a tablet) with an incompatible grid orientation that creates ugly artefacts and makes the above mentioned wonderful OLED panel worthless.

 

So this is a either a design defect or a poor choice of OLED/touch screen combination together with a severe lack of QA (at least on one production series of this screen). I guess some people just got the chance to get a touch layer from another series that doesn't create this issue.

altendky
Fanfold Paper
Posts: 16
Registered: ‎11-13-2019
Location: US
Views: 407
Message 36 of 101

Re: P1 Gen 2 - Small dots on OLED screen

I don't have a proper macro setup but...  see attached.  I had to crop and resave :[ to get below the 10mb limit.

 

Please do take care to not introduce resampling artifacts when reviewing the image.  If someone wants to explain how there are artifacts from the camera etc...  maybe.

Guru
Posts: 2,148
Registered: ‎04-20-2008
Location: US
Views: 403
Message 37 of 101

Re: P1 Gen 2 - Small dots on OLED screen

When I zoom into the image, I can begin to see diagonal dark lines in a portion of the image. Also, it appears that there is a luminance variation from left to right as well. 😗


P53 XEON 2276 BIOS 1.19 OLED UHD 4K Multi-touch display, 96GB RAM, RTX5000, RAID 1, 1TB x 2 Samsung PM981, 1TB PM981, WWAN
P70 XEON 1505, BIOS 2.32, 4k Display, 64GB, M3000M NVIDIA GPU, RAID1 1TB Samsung PM981 PCIe-NVMe SSD x 2, 2x Samsung 850 Pro 1TB SSD. EM7455 WWAN
P1. BIOS 1.25,Xeon Processor, 4k UHD IPS multi-touch display, 32GB, PM981 1TB x 2, RAID1

I am not an employee nor an agent of Lenovo.
altendky
Fanfold Paper
Posts: 16
Registered: ‎11-13-2019
Location: US
Views: 401
Message 38 of 101

Re: P1 Gen 2 - Small dots on OLED screen

I had the camera angled to the right.  The depth of focus is very shallow and this was an easy way to expose various layers in one easily navigable shot.  So, don't read too much into left/right variation like luminance.

Guru
Posts: 2,148
Registered: ‎04-20-2008
Location: US
Views: 358
Message 39 of 101

Re: P1 Gen 2 - Small dots on OLED screen


@camille21 wrote:

@harrisb wrote:

Which series do you believe does not have this defect? All of the OLED panels for Lenovo 15.6" are the same p/n. Did you mean another manufacturer??


It's just a guess, but since not every owner of the P1 Gen 2/P53 OLED experience this issue, or maybe not at the same level (e.g. you mentioned that you can see the effect only if you pay attention, while on my screen it is very visible) maybe not all screens are from the same production line despite having the same p/n, and that some may have a different touch layer. Or maybe it comes from a difference of transparency of that touch grid that increases or lessens the issue, idk.


It's interesting that my X1YogaGen2 with the OLED touchscreen (14") does not exhibit any of these issues. Others with the same system have reported the same (no visual effects).


P53 XEON 2276 BIOS 1.19 OLED UHD 4K Multi-touch display, 96GB RAM, RTX5000, RAID 1, 1TB x 2 Samsung PM981, 1TB PM981, WWAN
P70 XEON 1505, BIOS 2.32, 4k Display, 64GB, M3000M NVIDIA GPU, RAID1 1TB Samsung PM981 PCIe-NVMe SSD x 2, 2x Samsung 850 Pro 1TB SSD. EM7455 WWAN
P1. BIOS 1.25,Xeon Processor, 4k UHD IPS multi-touch display, 32GB, PM981 1TB x 2, RAID1

I am not an employee nor an agent of Lenovo.
zipuni
Fanfold Paper
Posts: 7
Registered: ‎12-07-2019
Location: US
Views: 297
Message 40 of 101

Re: P1 Gen 2 - Small dots on OLED screen

I also noticed the "small dots" from day one on my X1Eg2 OLED and I really really hate them.  I should have checked the forum earlier and returned the laptop as the more time goes on the more I dislike the "pattern" that is throughout the screen on white backgrounds.  This OLED "bug" together with the fact that now my Brightness control is stuck (a different bug) made me register to the forums and express my disatisfaction.  This is completely unnacceptable QC!

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