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nkaufman
Token Ring
Posts: 215
Registered: ‎01-19-2016
Location: US
Views: 1,361
Message 1 of 6

P50 display and PWM etc

Hello,

 

Got details of my LCD - FHD, non-touch screen of the P50 that I got recently. The details from HWiNFO64, v5.43-3060 are as follows:

 

Monitor - LG LP156WF6-SPK3

 

Hope that HWiNFO is correct.

 

Any ideas how this screen compares with the other 2 that Lenovo seems to be having for the P50?

 

Thanks,

improwise
HDMI
Posts: 181
Registered: ‎06-14-2016
Location: SE
Views: 1,297
Message 2 of 6

Re: P50 display and PWM etc

I would imagine that the reason for you even asking about this is because you are not too happy with the screen you got?

 

https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/When-do-we-finally-get-a-good-screen-P50...

nkaufman
Token Ring
Posts: 215
Registered: ‎01-19-2016
Location: US
Views: 1,230
Message 3 of 6

Re: P50 display and PWM etc

Not really. Rather it is the other way round.

 

I'm not having any issues with this unit and was wondering if there was a way to test it or if this particular model is devoid of those PWM issues.

microfishd1
Token Ring
Posts: 268
Registered: ‎02-19-2015
Location: US
Views: 1,215
Message 4 of 6

Re: P50 display and PWM etc

I am told that every screen (except the super high-end screens) uses PWM.
Most screen manufacturers (I'm not referring to laptop assemblers such as Lenovo or Asus, but the makers of the screen itself, such as Samsung, LG, or Sharp.) try to set the Hz of the PWM to where it is not noticeable or bothersome. Other manufacturers, as evidenced by many posts on this forum, pay less attention to this matter or have rather-to-very bad QC.

The easy/common way to tell if you are affected by PWM is as follows:
If you have an iPhone or similar smart phone with a camera, point the camera at the screen. Take a couple of still pictures (of the P50's screen), and a movie of the same. Take these pics/videos at 100%, 50%, 20%, & 0%.
If you notice flickering lines or stripes in the pictures/videos (similar to these: https://i.stack.imgur.com/LF3Y4.jpg), than you probably have PWM. If you do not see these lines in any of your pictures or videos, than it is safe to say that your screen does not use noticeable PWM.

I do not know how to tell definitively whether or not any screen uses PWM or at what frequency the PWM starts.

see also: http://www.overclock.net/t/1555354/official-crossover-2795-qhd-pwm-flicker-free-overclock-able-matte...

-----------IBM T40: XP PRO SP3, 14.1" 4:3 display, 512MB DDR RAM, 40GB HDD, ThinkLight, DVD.
Lenovo Ideacentre H215: AMD Athlon II X2 215, 500GB HDD, 4GB DDR3 RAM, 64-bit Win7, AMD 760G.
P50 i7, M2000M, 1x16GB RAM, 1080p non-touch, 512GB SSD, 500GB HDD, Backlight, No WWAN, No PWM, No Raid.
Khakiass
Token Ring
Posts: 34
Registered: ‎06-25-2013
Location: US
Views: 1,193
Message 5 of 6

Re: P50 display and PWM etc

I found a review of your panel here, which does indicate that it utilizes PWM:  http://www.notebookcheck.com/Test-Aldi-Medion-Akoya-P6670-Laptop.181416.0.html

 

My P50 is running a LTN156HL09901 panel, which also has PWM enabled per NotebookCheck, although I have never noticed it, or my eyes are not sensitive to its effects.  I also rarely run at anything less than full brightness, which is the only time that PWM should come in to play.

 

Here are the panel differences in summary, per NotebookCheck's calibration:

 

LP156WF6-SPK3 

Brightness: 269.3 cd / m²

Contrast: 442: 1

sRGB gamut: 57%

 

LTN156HL09901

Brightness: 220 cd/m²

Contrast: 900: 1

sRGB gamut: 60.9%

 

Hope this helps!

microfishd1
Token Ring
Posts: 268
Registered: ‎02-19-2015
Location: US
Views: 1,136
Message 6 of 6

Re: P50 display and PWM etc

FWIW HWiNFO says i have 

Monitor Name:                      Lenovo [Unknown Model: LEN40BA]

Monitor Name (Manuf):       LP156WF6-SPK3

Monitor Hardware ID:          Monitor\LEN40BA

As I said before, I have not observed any PWM on it.  I have been satisfied with it.

-----------IBM T40: XP PRO SP3, 14.1" 4:3 display, 512MB DDR RAM, 40GB HDD, ThinkLight, DVD.
Lenovo Ideacentre H215: AMD Athlon II X2 215, 500GB HDD, 4GB DDR3 RAM, 64-bit Win7, AMD 760G.
P50 i7, M2000M, 1x16GB RAM, 1080p non-touch, 512GB SSD, 500GB HDD, Backlight, No WWAN, No PWM, No Raid.

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