New Monitor Panel Discussions

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    @ Umbral

    Because CRTs don’t have distinct pixels or indeed a ‘pixel pitch’ (instead having a ‘dot pitch’ and less well-defined ‘dots’) you can’t really compare them to LCD pixel pitches directly. The ‘pixel grid’ can also vary based on screen surface, panel type and other factors. This isn’t something I’ve explored in great detail myself but just something I have casually observed. When using LCDs of a given pixel density I sometimes find the pixel grid (or sometimes only the vertical component of it depending on subpixel layout) more distinct than on others of the same density.

    I don’t currently have any 1920 x 1080 27″ models connected up but I will have a look next week and see what I observe.

    @ ghostxix,

    Those Dell models are all unique, offering different capabilities and in some cases resolutions and aspect ratios. It isn’t the case that the S2415H, U2415 or U2515H have or will replace the U2414H. Instead they will coexist. There aren’t any fundamentally different ~24″ AH-IPS panels in production at the moment so any update (replacement) to the U2414H would be fairly minor. I don’t expect to see such a model until Q3/Q4 next year at the earliest, either. Anything I do say would be pure speculation – at any rate I don’t think you need to worry about the U2414H becoming ‘obsolete’ any time soon or anything like that.


    Thanks for your answer PCM2, also i hope you will get your hands on U2415 for review, extra pixels should be useful for desktop usage


    Thank you PCM2,

    Can you please tell me what is the threshold when the eye no longer observes motion blur in LCDs because of its own blur ( Persistence of vision ). Is it around 10 ms ? So a display with that value or below would not produce observable blur to the human eye/brain ?

    Thank you.


    It is around half a frame for a sample and hold display. ~8ms for 60Hz and significantly lower for higher refresh rate displays. See the ‘Sampling method’ section of this article.


    Help me understand something.

    A 60Hz display with 8ms refresh rate/input lag would feel like a fluid experience without any motion blur to our eyes and a 120Hz display would need 4ms refresh rate/input lag to be as fluid as the 60Hz 8ms one (motion blur less) ?

    Thank you.


    It most certainly wouldn’t feel like a fluid experience with no motion blur to our eyes. It’s just that the motion blur from our eyes would mask the 8ms pixel response of the monitor. The reason that figure needs to be 4ms for 120Hz is that the motion blur is lower at higher refresh rates – so an 8ms pixel response in that case would be visible beyond the motion blur from our eye movement. It is explained a lot better in the article.


    My plan was to wait for a good IPS 4k monitor but it seems that 4k is outdated already. I have just found a 5k IPS monitor which is coming out this month.Dell UltraSharp UP2715K. Would it be worth going for this instead?


    ‘5K’ is not going to replace ‘4K’ UHD as a standard. We’re still in the very early days of UHD monitors and there are several key factors (some of which are mentioned earlier in this thread) which have not yet been achieved. For example:

    1) The Rec 2020 colour gamut. That’s part of the UHD standard.
    2) The ability to drive the 3840 x 2160 resolution comfortably in modern games with a single GPU. There is currently a lot of compromise in that area.
    3) ‘Perfect scaling’ – still a long way off that as well.
    4) 4K broadcasts (TV thing) and movie content being ‘the standard’.
    5) Higher refresh rates than 60Hz with the display inputs to drive them (‘5K’ on the UP2715K requires multiple simultaneous DP connections, incidentally).

    ‘4K’ has barely penetrated the market and it’s here to stay. In fact even 1920 x 1080 monitors show no sign of disappearing just yet – and won’t do until most of the factors above have been sorted. ‘5K’ is nothing more than a niche ‘step up’ in pixel density. It is not replacing ‘4K’ at all, it is complimenting it. Much like 2560 x 1440 does to 1920 x 1080 models.


    6) HDR – High Dynamic Range coming in 2015 on some TVs.


    In reference to the discussion as to whether OLEDs will be viable, one thing that isn’t often discussed in detail is how much more energy efficient OLEDs should be compared to LCDs.

    Whenever an LCD subpixel is partially or fully closed light from the backlight that falls on it is partially or fully wasted. This means that whenever you are not displaying a pure white screen you are wasting energy in this fashion.

    Another major problem is that light that falls on a given subpixel is filtered by the color of the subpixel. Consider an ideal case of a backlight that produces 3 line spectra (RGB) that each pass fully through a subpixel of the respective color (green spectral line passes 100% through green subpixel, etc). Each subpixel therefore wastes 2/3 of the light that falls on it. So even when there is no closed pixels (displaying a pure white screen) the monitor has an efficiency of at most 1/3.

    These problems can be mitigated by using an array of locally-dimmable backlights but most LCDs don’t use them. OLEDs do not suffer from the above problems and thus should have much more efficiency.


    Hi wfeldman and welcome to the forum!

    That is indeed a very important consideration and also a real potential advantage to OLED. It’s touched upon in our OLED article as well. It would certainly be nice not needing as much power draw if dark/mixed content is being displayed and I would imagine at a reasonable brightness level lighter content wouldn’t draw too much power either.


    Even when displaying bright screens the OLED should be more efficient. As per reasons given above LCDs (assuming no sector dimming) always waste at least 2/3 of the backlight output. By the way, Merry Christmas!


    Merry Christmas to you too!


    Nice to see another wide gamut model entering the scene, especially one with such a tight calibration and flexible LUT features. Interestingly enough I’ve known about this since earlier this year so it’s nice to have some more information on it. Would be nice if BenQ had a product page up for it though.


    About this :

    LG also will bring very thin bezels and depth in TVs in 2015 too. (for LCD)

    So the question is will these new monitor models also be very thin like their TV counterparts in terms of depth ?

    It would be really nice to have less depth.


    In order to make a monitor supremely thin manufacturers need to do two things:

    1) Get rid of VESA holes. They need to give extra room for the screws, so they don’t eat into the panel.

    2) Migrate the ‘bulky electronics’ to the base of the monitor. The Samsung S27A750D which I use as one of my monitors at the moment does that and also lacks VESA holes, naturally.

    The LG models have a fairly normal side-profile for a monitor with standard WLED backlight. Nothing razor-thin or anything. You can see an image of the side profile here.


    Check this :
    Surprising numbers !


    They are indeed surprising and quite impressive, at least on paper. I’d like to know how that sort of thinness was achieved and crucially what the screens look like from a side aspect. I suspect they are measuring the thinnest point and there are some areas which protrude further back.


    Any model from BenQ that is going to use AUO LCD M270HVN02.3 ? Any news about this panel ?
    Do you think it will be a FreeSync monitor ?
    What about refresh rate 60Hz or 75Hz like new LG monitors ?

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