WEBVTT

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this is part of a new generation of OLED displays that LG is calling dual mode it

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allows you to switch between the native 4K resolution and 1080p resolution wait

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you must be thinking I can do that on my monitor right now is my monitor dual

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mode or no DEA mode yes but also no if

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you have a Modern Display it may be capable of interpreting a signal in all

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of those different modes but only one of them is native that is able to be

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displayed cleanly without any scaling

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that is the trick here or at least it

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would be if it worked as well as this segue to our sponsor ug green their

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before we get into the details let's just try the two different modes because

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there is more to this than just setting it to the ideal mode and then forgetting

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about it forever in theory a display like this can offer The Best of Both

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Worlds right now what we're looking at is 4K 240 HZ obviously there's

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outstanding picture Clarity amazing motion Clarity but because of how human

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Vision Works OLED is is still going to have some drawbacks compared to a

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classic CRT monitor that is unless you use black frame insertion to

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artificially strobe the image so to my eyes this is this is pretty darn clear

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even with fast onscreen movements but it

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can be better we experimented with this before we started and it turns out mid

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game at least in this game I can just

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press the mode toggle button and now we're looking at 1080p 4 180 HZ

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we still get the same outstanding HDR and color performance but at this size I

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would say the image Clarity is a bit of a drag the upside is that by running at

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a lower resolution we overcome the limitations of our DisplayPort link and

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we can run it a whopping 480 Refreshers

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per second now I already spoke about this in detail when I took my first look

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at alienware's new 500 HZ display but in a nutshell it makes more of a difference

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than you would probably imagine for reasons that we'll get into later in

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terms of the subjective experience it's

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great like I just can't miss heads with

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this thing you know got him which is really cool but why can't I just go into

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the advanced Windows menu and change my refresh rate here there dual mode right

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well no since the days of this connector

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monitors have included a bit of metadata called called an edid the ID's purpose

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is to report the display's capabilities to any connected device be it a computer

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game console or what have you this monitor has two eids which can be

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toggled through the OSD or this little

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button right here we extracted them we

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ran them through an interpreter and we had a look at the output end surprisingly the only major difference

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is that the 4K mode will not allow the display to be driven past 240 HZ

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regardless of the configured resolution in the window settings and the 1080p

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edid doesn't list as many resolutions and maxes out at 1080p 480 HZ if you try

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to force feed it 4K resolution in 1080P

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mode it will actually scale that input down to 1080P and then back up again to

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the native 4K of the panel why did they feel the need to do this well we have

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some theories but let's come back to them after we've talked about the

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performance of the display and determined whether this thing is even worth jumping through all these hoops

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for starting with color accuracy srgb mode is solidly okay the color

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temperature is a little cool but if you don't know what that means you're unlikely to notice it and if you do you

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can simply calibrate your troubles away at least unless you want to use gamer

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mode unfortunately it is tuned for

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colors that are pretty but not accurate

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no problem just ignore it then right I guess but unless you're using one of the

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first four listed display modes an extra frame of processing latency gets added

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at 480 HZ or 240 HZ for that matter it's

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not such a big deal but if you use adaptive sync for smoother animations

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and your GPU doesn't happen to be god tier it could be a problem for you in

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HDR we measured both low Peak brightness mode and high peak brightness mode low

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is best viewed in a dim room while high managed to over 1,00 nits in a 1% window

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for dazzling highlights now let's talk about responsiveness this is a gaming

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monitor first and foremost and both of the modes are great but they have some

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small differences because it refreshes at half the rate the 4K mode has

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inherently worse input latency of course we're talking about a difference of

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about 1 millisecond so who cares right

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well hold on we've said for years that there's a point of diminishing returns

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past about 240 HZ but the reason that

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faster matters for OLED displays is because of how our eyes perceive motion

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by switching more frequently we will see fast moving objects with better Clarity

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the 1080p mode has a curious trait of its own though if you run it at a lower

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refresh rate the latency goes up more

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faster than you would expect perhaps it has something to do with scaling those

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inputs it is a 4K native panel regardless of whether it's running in a

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1080p mode and scaling is impossible to

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avoid on a Modern Display because these panels are made up of a fixed array of

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pixels that can't change in size or shape by contrast classic CRTs had no

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concept of physical pixels they could adjust the beams to draw tighter lines

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for higher resolution even if it came at the cost of brightness or refresh rate

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now sometimes scaling can be simple 4K

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happens to be exactly four times the number of pixels as 1080p so that's fine

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you just double in each mention a voila

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perfect clarity just with bigger blocks

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this is called integer scaling because the higher resolution can cleanly be

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divided by the lower one 4K also happens to be divisible by 720p and for you

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retro Gamers 240p as well so you would

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think that we would use that kind of scaling as often as possible but as it

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turns out most displays just throw a

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blurry ambing filter on it and call it a

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day of course this isn't most displays is it if LG

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expects you to use 1080p mode it had better be clean so how does it hold up

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as it turns out pretty okay even in 4k

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mode it seems like it's trying to do integer scaling it's sharper than you'd

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expect but if you look closely each

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1080p pixel is offset down to the right

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by half of a 4K pixel okay hold on a second L is half a

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pixel you just told me they couldn't change size and shape okay yes but check

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this out we've established that integer scaling converts four physical pixels

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into a single virtual 1080p pixel if you

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offset that by half a pixel in each Dimension now that one pixel takes up

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nine at 4K one in the middle and 8 half

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pixels on each side at first we thought this must be some kind of intentional

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scaling thing but after looking at how it affects the corner pixels we think it's actually

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just an off by one error somewhere in the display logic that Maps the scaled

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image to the panel we get to see how well it actually scales if we try any

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other resolution including 720p and it gets blurred this is unfortunate

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because they could have integer scaled 720p as well that would mean that the

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Lion's Share of common resolutions over the past two decades would look perfect

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on this display at 480 HZ that would be

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awesome if LG could rectify it in the future but if not it's a pitfall that

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hopefully at least other manufacturers who use a similar technology can avoid

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in the future and in LG's defense it's

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not really a deal breaker in 4k mode you

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can still use integer scaling on your GPU driver or you can use upscaling

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methods like dlss and FSR to render your

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games at a lower resolution for better performance and then output 4K native

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from your GPU which is obviously going to look perfect the question then

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becomes why does the 1080p mode exist

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and should you bother to use it well our

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best educated guess for why the mode switch even has to happen is that the

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timing controller or the tcon needs to be reset to change its Behavior even

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though 1080p at 480 HZ requires half of the bandwidth of 4K at 240 HZ 480 HZ is

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fast in terms of time so the timing controller probably can't directly

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address the full 4K pixel Grid at that

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crazy speed so instead it appears to use a technique called line doubling

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scanning out each line of the image twice to reduce the processing load we

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can verify that this is happening by looking at the pixels rather than being

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offset in both directions as 1080p looked in the 4K mode now the image is

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only offset to the right in summary then intriguing product hopefully it's a

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solution that we just won't need a few years from now but if you want

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tomorrow's Tech technology today and you don't mind pressing this switch

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depending on what mode you want to run in and what game you're running and also

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if you don't mind spending $1,400 you're getting a genuinely

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impressive piece of technology even if there are a few limitations it also

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makes me even more excited for the day after tomorrow no not that one uh when

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we see updated tcons that can push even greater than 480 HZ because with pixel

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response times that are in the .3 millisecond range OLED has a lot more

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headro to be pushed and while 600 HZ or

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heck even this 480 HZ display is going to be endgame territory for most people

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perfect to the ey motion Clarity could require closer to 1,000 HZ or even more

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which is so fast that if you blink you'll miss it like the segue to our

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off thanks for watching guys go check out that time we pitted an OLED against

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an HD crrt for a little bit more on the importance of motion Clarity let's go

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finish the match