Panda 144Hz IPS Panel Pixel Inversion Issues?

Everything about displays and monitors. 120Hz, 144Hz, 240Hz, 4K, 1440p, input lag, display shopping, monitor purchase decisions, compare, versus, debate, and more. Questions? Just ask!
Boomchakadah
Posts: 193
Joined: 15 Aug 2018, 02:44

Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by Boomchakadah » 15 Jul 2020, 04:58

Can anyone who's running one of those Panda IPS panels please confirm whether they have pixel inversion issues or not? (Asus VP249QGR, Acer VG240Y, ViewSonic XG2405, AOC 24G2, Asus VG249Q, MSI G241, etc)

My Acer XV240YP 1080p 165Hz IPS monitor just got back from Acer. I sent it to them 2 weeks ago for RMA because of the pixel inversion issue. Despite me having sent videos showcasing the issue, the technician said that he couldn't find any issue, but he replaced the motherboard just in case. So, I just finished testing the monitor a few hours ago, and the pixel inversion issues are still there.

Pixel inversion checker on the TestUFO website.
Test 1. https://www.testufo.com/inversion#patte ... tion&ppf=5
Test 2. https://www.testufo.com/inversion#patte ... ity2&ppf=5

Pixel inversion checker on Lagom's website.
http://www.lagom.nl/lcd-test/inversion.php
VG258QM 280Hz TN (main)| XG2431 240Hz IPS | XL2540K 240Hz TN | XV252Q 1080p 280Hz IPS | XL2546K 1080p 240hz TN | AW2518HF 1080p 240Hz TN | XV240YP 1080p 165Hz IPS | XG2402 1080p 144hz TN | 27GL83A 1440p 144Hz IPS | XL2411P 144Hz TN | XF240H 144Hz TN

User avatar
RealNC
Site Admin
Posts: 3740
Joined: 24 Dec 2013, 18:32
Contact:

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by RealNC » 18 Jul 2020, 09:30

Yes, all LCD monitors have pixel inversion artifacts in tests that are designed to produce such artifacts. Voltage inversion is a technique performed by all LCD panels. I am not aware of any consumer-grade LCD-based display technology right now that can work without voltage inversion.

These tests are good for comparing different monitors with each other. They are not intended to test whether or not an LCD monitor has these artifacts or not, because they all do. In regular use (meaning when not running a pixel inversion test,) IPS panels usually exhibit less artifacts. That doesn't mean that they don't have inversion artifacts in general.
SteamGitHubStack Overflow
The views and opinions expressed in my posts are my own and do not necessarily reflect the official policy or position of Blur Busters.

overaller
Posts: 12
Joined: 18 Nov 2020, 22:53

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by overaller » 19 Nov 2020, 12:58

Does your monitor have any visible artifacts with regular use, or are they visible only on the inversion test patterns?

User avatar
Chief Blur Buster
Site Admin
Posts: 11647
Joined: 05 Dec 2013, 15:44
Location: Toronto / Hamilton, Ontario, Canada
Contact:

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by Chief Blur Buster » 19 Nov 2020, 13:09

Make sure not to confuse ‘inversion” (the algorithm in ALL LCDs) with “inversion artifacts” (side effects)
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

Image
Forum Rules wrote:  1. Rule #1: Be Nice. This is published forum rule #1. Even To Newbies & People You Disagree With!
  2. Please report rule violations If you see a post that violates forum rules, then report the post.
  3. ALWAYS respect indie testers here. See how indies are bootstrapping Blur Busters research!

Boomchakadah
Posts: 193
Joined: 15 Aug 2018, 02:44

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by Boomchakadah » 19 Nov 2020, 14:13

overaller wrote:
19 Nov 2020, 12:58
Does your monitor have any visible artifacts with regular use, or are they visible only on the inversion test patterns?
I RMA'd the monitor for the 2nd time, and they sent me a new one. The new one does not suffer from those inversion artifact issues.
Yes, those artifacts were very visible with regular use. Also in games, pixels looked like they were shivering, and the monitor didn't look smooth at all because of that.

I read somewhere that those pixel inversion tests can actually trigger pixel inversion artifacts. My secondary monitor had zero inversion artifacts, but after torturing it/running those tests a lot comparing it to that defective XV240Y that I had before, it ended up getting infected. Here are a few comparison videos I took before it got infected.
1. https://drive.google.com/file/d/15i1cSl ... sp=sharing
2. https://drive.google.com/file/d/1nahNrH ... sp=sharing

I found a safer way to check if a monitor has those inversion artifacts issues or not. Basically, hop into a quick game of krunker.io, and stare at walls while jumping up and down. If your monitor has pixel inversion issues, pixels on the wall will look like they are stuttering or shivering.
Last edited by Boomchakadah on 20 Nov 2020, 08:53, edited 1 time in total.
VG258QM 280Hz TN (main)| XG2431 240Hz IPS | XL2540K 240Hz TN | XV252Q 1080p 280Hz IPS | XL2546K 1080p 240hz TN | AW2518HF 1080p 240Hz TN | XV240YP 1080p 165Hz IPS | XG2402 1080p 144hz TN | 27GL83A 1440p 144Hz IPS | XL2411P 144Hz TN | XF240H 144Hz TN

overaller
Posts: 12
Joined: 18 Nov 2020, 22:53

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by overaller » 19 Nov 2020, 14:56

Boomchakadah wrote:
19 Nov 2020, 14:13
overaller wrote:
19 Nov 2020, 12:58
Does your monitor have any visible artifacts with regular use, or are they visible only on the inversion test patterns?
The new one does not suffer from those inversion artifact issues.
Glad it worked out for you!
Did changing the refresh rate change the artifacts appearance or intensity? I have similar issues with the AOC 24G2U , I'm curious if this is a panel or board issue.

User avatar
Chief Blur Buster
Site Admin
Posts: 11647
Joined: 05 Dec 2013, 15:44
Location: Toronto / Hamilton, Ontario, Canada
Contact:

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by Chief Blur Buster » 19 Nov 2020, 15:33

Boomchakadah wrote:
19 Nov 2020, 14:13
I read somewhere that those pixel inversion tests can actually trigger pixel inversion artifacts.
That is because some monitors switches inversion algorithms when it detects voltage imbalances in the panel amplified by displaying a pixel pattern matching the monitor's inversion patterns. Or you might be referring toe image retention (a different kind of side effect, which inversion algorithms is supposed to prevent). This is not dangerous, and it goes back to normal after a while.
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

Image
Forum Rules wrote:  1. Rule #1: Be Nice. This is published forum rule #1. Even To Newbies & People You Disagree With!
  2. Please report rule violations If you see a post that violates forum rules, then report the post.
  3. ALWAYS respect indie testers here. See how indies are bootstrapping Blur Busters research!

Boomchakadah
Posts: 193
Joined: 15 Aug 2018, 02:44

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by Boomchakadah » 20 Nov 2020, 09:14

overaller wrote:
19 Nov 2020, 14:56

Glad it worked out for you!
Did changing the refresh rate change the artifacts appearance or intensity? I have similar issues with the AOC 24G2U , I'm curious if this is a panel or board issue.
Yes. At 60Hz it was even worse. I highly recommend returning it and buying another one. It's a panel issue or perhaps some kind of voltage synchonization issue between the panel and the board.

After experiencing pixel inversion artifacts, ghosting performance and image quality are no longer the first things I test after buying a new monitor.
VG258QM 280Hz TN (main)| XG2431 240Hz IPS | XL2540K 240Hz TN | XV252Q 1080p 280Hz IPS | XL2546K 1080p 240hz TN | AW2518HF 1080p 240Hz TN | XV240YP 1080p 165Hz IPS | XG2402 1080p 144hz TN | 27GL83A 1440p 144Hz IPS | XL2411P 144Hz TN | XF240H 144Hz TN

overaller
Posts: 12
Joined: 18 Nov 2020, 22:53

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by overaller » 20 Nov 2020, 10:36

Boomchakadah wrote:
20 Nov 2020, 09:14
overaller wrote:
19 Nov 2020, 14:56
Did changing the refresh rate change the artifacts appearance or intensity?
Yes. At 60Hz it was even worse. I highly recommend returning it and buying another one.
Thanks, but unfortunately I'm out of the return windows. No luck with AOC support, too. Mine actually doesn't have any visible artifacts above 90-100 hz (you can view my post history for a more detailed description of what mine looks like).
So I'm not quite sure if it's considered as a defect by AOC.

Blackwolf
Posts: 5
Joined: 24 Jul 2021, 15:33

Re: Panda 144Hz IPS Panel Pixel Inversion Issues?

Post by Blackwolf » 24 Jul 2021, 15:50

@Boomchakadah

I am facing the same issue on my Msi Optix G241. It is especially visible in motion. When I watch a video/movie, I am able to see the pixel pattern on their faces. It's really annoying. What I've tried:

- Different cables(dp/hdmi)
- Different hz
- Different setups(laptop/desktop)
- Different settings

No luck. Like you said "At 60Hz it was even worse." Unfortunately I am using 60 hz my main setup. But I've tried with 120 hz and 144 hz, still it is visible. There is backlight bleed also. I will try to return but I am undecided. Should I want a new unit (G241) or a different brand/model?
Last edited by Blackwolf on 26 Jul 2021, 17:37, edited 1 time in total.

Post Reply