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395 Posts

08-03-2009

UK

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Internal LCD Monitor Flickering (Online Test)

2009-11-16, 16:19 PM

I recently came across an LCD test page at http://www.lagom.nl/lcd-test/inversion.php and noticed that Pattern 4a/4b triggers noticeable flickering on my W700 LCD screen. The flickering is very noticeable if I I scroll down to the middle of the page for an almost full-screen test. It gives me a headache. Pattern 5 also triggers a mild flickering. Swapping the refresh rate between 50 Hz and 60 Hz doesn't change the flickering behaviour.

 

I'm not sure whether this kind of flickering is normal for the W500/W700 LCD panels. Can someone please test and confirm?

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177 Posts

08-17-2009

North Carolina, USA

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  • Message 2 of 8

Re: Internal LCD Monitor Flickering (Online Test)

2009-11-22, 19:52 PM

Hi hazart,

 

The results are strange.

 

I got flicker on 2a and 4a, but if I messed with the mouse the color would change

from "gray flickering" to "no flicker" and some color (I think green). This is in the

fullscreen mode. I do not notice any flicker under normal use.

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395 Posts

08-03-2009

UK

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Re: Internal LCD Monitor Flickering (Online Test)

2009-11-22, 22:42 PM

Thanks for the testing. It seems that the flickering I've observed is normal to our screen. :smileysad: In fact, I've tested this on my friends' X60s and MacBook, both screens flicker. What you've observed should be normal, too, because the website describes Patterns a and b as follows:

Note that the patterns 2, 4, 6, and 7 are split into an 'a' and a 'b' version. The only difference between the 'a' and 'b' versions is that they are offset vertically (2,4,6) or horizontally (7) by one pixel; which one actually flickers is dependent on how you position your browser window.

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1041 Posts

03-10-2009

Michigan

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Re: Internal LCD Monitor Flickering (Online Test)

2009-11-23, 14:51 PM

Thanks for the link to that excellent monitor test site!

 

My external MVA monitor flickers slightly on patterns 2a and 4b and noticeably on pattern 4a. The techmind lcd page linked from the test page says this about the inversion test patterns:

 

"The... test patterns deliberately excite only one polarity-half of the inversion pattern for some common schemes, and one of them should cause your screen to flicker. This is not a fault with the screen, but enables you to find out which inversion scheme your screen uses."

 

Although it then goes on to say:

 

"If it really flickers a great deal then it may indicate that the common-electrode voltage has not been set up properly. In that case you might also perceive a "dot crawl" effect on plain colours of medium brightness. A grossly mis-set common-voltage will also make your screen more susceptible to temporary 'image sticking' problems."

 

Although my monitor flickers annoyingly on test pattern 4a, I don't see any "dot crawl" in the test linked from the same page.

 

All in all, a very interesting test and explanation. But you probably have nothing to worry about.

---------

Results of Your Ideal Business-Class Laptop survey, concluded 2009-07-29.

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395 Posts

08-03-2009

UK

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Re: Internal LCD Monitor Flickering (Online Test)

2009-11-23, 19:02 PM

Thank you for reading through the lengthy text at techmind.org and extracting the valuable information; I feel reassured. :smileyhappy:

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76 Posts

09-19-2008

United States of America

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  • Message 6 of 8

Re: Internal LCD Monitor Flickering (Online Test)

2010-04-16, 17:57 PM

I tried it today and it seems the W700 I have does not have flicker at all - however I see that it "may" also depends on OS and screen refreshing rate. (I'm using XP 64)

 

On my 24" s-IPS monitor the 4b does flicker alittle, using W700 displayport - it goes away near the center of the screen but flicker "very slightly" towards the edge.

 

When I have dual screen to compare (forgot both to 60Hz or 75Hz), then the 24" desktop screen actually flicker more on 4b, but still at barely noticeable level.

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18 Posts

04-16-2010

Houston, TX

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Re: Internal LCD Monitor Flickering (Online Test)

2010-07-05, 21:10 PM

My W700 LCD has more of a rolling pattern in a portion of the screen which will go away when a very slight pressure is applied to the back of it.  Very annoying but thank goodness I use external monitors 90% of the time.

 

Any thoughts?

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32 Posts

01-18-2010

London

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  • Message 8 of 8

Re: Internal LCD Monitor Flickering (Online Test)

2010-07-06, 16:44 PM

I've got 2 W510's with FHD's.  One fails and one passes the test.  Good thing that I've got extended support, the engineer can come round and fix that.

 

He can also fix the creacking on the left palm rest.  Other than that great laptop with great performance.

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