Hi all. I just purchased a Dell Ultrasharp 2407wfp and it seems to have quite clear PWM.

I heard others found this monitor quite good. Does anyone know if some versions have PWM? I thought they were CCFL backlit?

Or has it likely had the backlight replaced or something?

Just confirming, this is PWM, not some other kind of progressive scan, yeah?

brightness=100

brightness=0

  • JTL replied to this.

    noigmn I can't comment since I don't own one but some CCFL monitors did have PWM, yes.

        JTL Thanks!

        Btw, I noticed in the pictures that the R, G and B channels seem out of phase in the PWM. Could that mean it has one of the backlights where separate R, G and B LEDs were used? Or maybe just a colour temperature change at different points during the on-off cycle of CCFL?

        It's still not that great for long term use, but it feels far less harsh than the scanning between black and white on the OLED phones.

        • JTL replied to this.

            noigmn Could that mean it has one of the backlights where separate R, G and B LEDs were used?

            I don't know for see but it seems implausible

              The Dell U2410 is like the only monitor I can use despite having lots of PWM-flicker (especially at 0% brighness). Go figure!

                MagnuM I have to say that the quality of the 2407 is magnificent otherwise. The colors and clarity are better than most I've seen. Maybe I'll try it for a bit and see if the PWM affects me. If it does, I might try modifying the backlight or backlight driver circuit.

                    I set my 2407 to 100% brightness and use the Nvidia controls to crank down the brightness of what comes out of the video card. This effectively disables the PWM while retaining a very usable brightness level.

                    noigmn I agree. The color reproduction is fantastic on my Dell U2410. I think it's because CCFL-backlit LCDs were pretty late in their lifetime cycle, so they had lots of time to perfect the technology.

                      PWM of the 2407WFP does not affect me as well. However the light does.
                      I wear glasses with a light blue filter in it and it is much better now.

                      May give the 2410 a try as well one day...

                      So I want to buy the DellU2407 or DellU2410.. What's the better choice here because I am not that wealthy

                        Raidadsp I'm not quite sure what the difference is. They are both pretty old monitors that probably aren't being manufactured anymore, so you would probably have to get them second hand off like Ebay or something.

                          6 days later

                          Personally, having both, I'd lean towards the 2407. For me, I've used two of them for years without any hassles. My 2410 is more recent and although I'm not using it on the same safe setup, my purely subjective opinion is that the 2407s are slightly 'better'.

                          dev