Go to the sales page and pick a monitor and open the specifications. If you see LED light bar system. That is continuously lit. If you see CCFL, then it is PWM.
I think I should clarify my question. I currently have a U2412M, which uses LED lighting, but it also clearly uses PWM to control the brightness of the LEDs. I can see a distinct strobe effect when I wave an object in front of the monitor at less than 100% brightness. I am looking for a monitor that does not flash the backlight off and on to control brightness, but rather one that dims the lights while leaving them on all the time.
Midix, thank you for the information. But you haven't told us if the LCD you bough with good PWM is much better for you than the rest, despite the vcom flicker and line crawl. How much better is it (or not)?
@ Dell_Chris - Sorry, that is wrong. LED monitors can suffer from it too. At this moment your Dell models U2913WM, U2713HM and U2713H have no PWM (the light is controlled by current control). Also getting a monitor with small pixels close together will help some people (e.g. a 2560 x 1440 rather than 1920 x 1080).
No, it is not true. Alienware M18x has PWM, at about 800 HZ with. At full brightness timeinjection goes to 100%, there it is non-PWM. Under that: PWM. At the moment only HP has one type of non-PWM screen really with under full brightness. Sorry. I'm sensible to PWM, too. I need totally non-flickering backlight at low brightness. That's a key problem for me, I'm using screens at low light and I have to use low brightness in good color-true mode. Non-PWM LED backlight is a bit more expensive way, because using DC instead of PWM can cause white colour balance problems, so trick (more expensive) a perfect non-PWM manufacturing, and uses more energy than producing the same light with much of PWM.
It's an old database, but can be useful, you can find some 24",27" screens without PWM-flicker.
DELL-Chris M
Community Manager
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56.9K Posts
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February 10th, 2012 14:00
Go to the sales page and pick a monitor and open the specifications. If you see LED light bar system. That is continuously lit. If you see CCFL, then it is PWM.
computergi
1 Rookie
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3 Posts
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February 10th, 2012 15:00
Hi Chris,
I think I should clarify my question. I currently have a U2412M, which uses LED lighting, but it also clearly uses PWM to control the brightness of the LEDs. I can see a distinct strobe effect when I wave an object in front of the monitor at less than 100% brightness. I am looking for a monitor that does not flash the backlight off and on to control brightness, but rather one that dims the lights while leaving them on all the time.
Thanks for your time.
computergi
1 Rookie
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3 Posts
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February 18th, 2012 14:00
Bumping in hopes of a reply
DELL-Chris M
Community Manager
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56.9K Posts
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February 20th, 2012 07:00
I have no idea. Maybe another user will chime in.
wassja
2 Posts
0
September 9th, 2012 03:00
I have a list on my site of LCDs without PWM or a very high PWM frequency, some of which are from Dell.
http://vasyafromukraine.webs.com/
wassja
2 Posts
0
September 10th, 2012 10:00
Midix, thank you for the information. But you haven't told us if the LCD you bough with good PWM is much better for you than the rest, despite the vcom flicker and line crawl. How much better is it (or not)?
AmadeusMozart
1 Message
0
January 30th, 2013 11:00
@ Dell_Chris - Sorry, that is wrong. LED monitors can suffer from it too. At this moment your Dell models U2913WM, U2713HM and U2713H have no PWM (the light is controlled by current control). Also getting a monitor with small pixels close together will help some people (e.g. a 2560 x 1440 rather than 1920 x 1080).
Hope this helps someone.
pocketninjahun
1 Message
0
May 26th, 2014 02:00
No, it is not true. Alienware M18x has PWM, at about 800 HZ with. At full brightness timeinjection goes to 100%, there it is non-PWM. Under that: PWM. At the moment only HP has one type of non-PWM screen really with under full brightness. Sorry. I'm sensible to PWM, too. I need totally non-flickering backlight at low brightness. That's a key problem for me, I'm using screens at low light and I have to use low brightness in good color-true mode. Non-PWM LED backlight is a bit more expensive way, because using DC instead of PWM can cause white colour balance problems, so trick (more expensive) a perfect non-PWM manufacturing, and uses more energy than producing the same light with much of PWM.
It's an old database, but can be useful, you can find some 24",27" screens without PWM-flicker.
http://www.tftcentral.co.uk/articles/flicker_free_database.htm
I hope it helps somehow for people with same problem.