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pixel walk test

D

dopple

Gawd
Joined
Oct 5, 2011
Messages
685
on lagom there is a pixel walk test that is another pwm like hidden source of flicker. the lagom site says that its not possible to adjust that but on this monitor i can adjust the flicker by changing the RGB or contrast values.

is this normal to be able to adjust this or do i have a faulty lcd?
 
To quote the page:

"One of the eleven boxes below may flicker slightly. The a/b variants are the same, except that they depend on the position of your browser window. Strong flicker indicates that the voltages in the monitor are misadjusted. Unfortunately, this is probably not something you can adjust by yourself. In practical situations, a visible flicker here means that plain colors show "pixel walk" when watched from close-by."

Note that they talk about strong flicker possibly being caused by mis-adjusted voltages. That info was written quite some time ago; the introduction shows a copyright date of 2008.

My older monitor (NEC 20WMGX2) does show a flicker that might be considered strong on pattern 4a, but changing contrast doesn't alter it, and I've never seen a flicker like that in ordinary use or anywhere besides that test. That monitor is 7 or 8 years old and has a lot of hours on it.

My much newer monitor (Benq BL2411, no PWM) only shows some subtle patterns on some of them as I click through the full-page versions, but it is in portrait mode which they warn may render the test not meaningful. None of the patterns I see could be described as flicker; they are more like static or banding, again never seen anywhere but those tests.

You should consider those test patterns unusually tough tests that can show design flaws in LCD screens that do not show in ordinary use. It's probably only if it were flickering really bad in a bunch of them that you might have a bad monitor.
 
evilsofa said:
My older monitor (NEC 20WMGX2) does show a flicker that might be considered strong on pattern 4a, but changing contrast doesn't alter it
Click to expand...

thats what im interested in knowing. because on this monitor i can diminish or increase the flicker which struck me as highly unusual. the note in the test says it shows misadjusted voltages which should change if you apply or reduce current which would happen if you played with the brightness/contrast/rgb channels.
 
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