Display Testing

With all of the extra connectivity there is to test with the Thunderbolt Display we can't forget the actual panel testing. Thankfully this part is pretty simple, the display characteristics are near identical to the 27-inch LED Cinema Display we reviewed last year.

Color Quality

We report two main quality metrics in our display reviews: color accuracy (Delta-E) and color gamut. Color gamut refers to the range of colors the display is able to represent with respect to some color space. In this case, our reference is the AdobeRGB 1998 color space, which is larger than the sRGB color space. So our percentages are reported with respect to this number, and larger is generally better.

Color accuracy (Delta E) refers to the display’s ability to display the correct color requested by the GPU and OS. The difference between the color represented by the display, and the color requested by the GPU is our Delta-E, and lower is better here. In practice, a Delta E under 1.0 is perfect - the chromatic sensitivity of the human eye is not great enough to distinguish a difference. Moving up, a Delta E of 2.0 or less is generally considered fit for use in a professional imaging environment - it isn’t perfect, but it’s hard to gauge the difference. Finally, Delta E of 4.0 and above is considered visible with the human eye. Of course, the big consideration here is frame of reference; unless you have another monitor or some print samples (color checker card) to compare your display with, you probably won’t notice. That is, until you print or view media on another monitor. Then the difference will no doubt be apparent.

As I mentioned in our earlier reviews, we’ve updated our display test bench. We’ve deprecated the Monaco Optix XR Pro colorimeter in favor of an Xrite i1D2 since there are no longer up-to-date drivers for modern platforms.

For these tests, we calibrate the display and try to obtain the best Delta-E we can get at 200 nits of brightness for normal use. We target 6500K and a gamma of 2.2, but sometimes the best performance lies at native temperature and another gamma, so we try to find what the absolute best performance could be. We also take an uncalibrated measurement to show performance out of the box using either the manufacturer supplied color profile, or a generic one with no LUT data. For all of these, dynamic contrast is disabled.

Color Tracking - XR Pro and Xrite i1D2

Uncalibrated performance remains fairly similar to last year's LED Cinema Display, however once calibrated the Thunderbolt Display is spot on with its predecessor:

Color Tracking - XR Pro and Xrite i1D2

As we mentioned earlier, a sub 2.0 delta E is good enough for professional use. Although not perfect the Thunderbolt Display falls within that range for sure.

LCD Color Quality

We measured slightly lower color gamut on the Thunderbolt Display than the original LED Cinema Display, however the result was much closer to the 2011 27-inch iMac. I couldn't visibly tell any differences and Apple indicates that color gamut shouldn't have changed, so it's quite possible that the differences here are due to our colorimeter and not the panel.

Color Uniformity

Now for color consistency, we take our best calibration profile from the very center at 200 nits and test color accuracy at 9 different places around the LCD display in an evenly distributed grid. We’ve shown before that calibration is localized across the display, partly due to the brightness not being uniform, partly due to the discrete nature of the display itself.

LCD Color Uniformity

The Thunderbolt Display was fairly uniform across its surface, something we noticed in reviewing the 27-inch LED Cinema Display last year. Uniformity is actually better on this panel than the one we reviewed last year, although in both cases I couldn't really tell any differences.

Peak brightness appears down slightly, but so are the black levels which result in a slightly better contrast ratio. Apple is also calibrating these things at the factory now so white points are now set at around 6300K vs. 7100K on the original 27-inch LED Cinema Display.

Thunderbolt Performance Display Testing - Brightness/Contrast & Uniformity
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  • dsumanik - Sunday, September 25, 2011 - link

    Lemme guess, you have a macbook?

    My original post was not to tear down the display so much as to point out the blatant bias in the review.

    Sorry man, its blatant.

    Also

    You have taken my qoutes as literals instead of sarcasm..obviously people with more than 2 brain cells would stack the display on some books instead of buying a height adjustable desk.

    C'mon dude!

    I kept bringing that up because anand used that as a way to offset the obvious shortcoming due to his bias toward this and apple products in general.....its a laughable excuse that was even mentioned!!

    He could have said :

    "The screen has no adjustable height, why did the engineers miss this one? You are going to have to stack your 1000 dollar display on some books in some instances, ruining the design goal of less clutter and a clean workspace that apple had intended to achieve"

    He instead implied it was no biggie cuz you can get a height adjustable desk and chair...

    LOL

    There is no reason the display couldnt have adjustable height, NONE.

    In your opinion..this would be "impossible" ok fine, you go with that.

    In my opinion:

    Someone in management thought the display would look cooler without it, and they could save some production costs while charigng the same pricetag.

    The bias was too much for me in this review, it distracted me from the actual product review...its all i could hear after awhile...there is a reason for that.

    Not because the display sucks or doesnt suck.

    There was a whole combined 60 seconds spent of the shortcomings of this diplay followed by a 14 minute praise apple and heres a blowjob for being so awesome commercial.

    I think the display is nice, thunderbolt is an interesting technology that could provide some awesome tech in the future......

    BUT

    I just dont see why this display was recommended as "a must have item"

    It was a commercial, plain and simple, because anand loves apple products and this is in his opinion one of the more interesting ones to come out this year.

    my original summary still stands with some corrections

    -no sound OUTPUT (sorry!)
    -no usb 3
    -incompatible with anything but 2011 MACS (right now)
    -1000 dollars (i could buy 5 TN 1920x1080 displays for same price)
    -you need to buy an adjustable desk and chair (joke!)

    I didnt list firewire as a pro because since the conception of this technology i have not ever used a device requiring it, nor has anyone else ive ever known. Yes I am sure poeple out there in internet land might need it somewhere.

    But do you think it would it be awesome if they included an ISA slot too????

    LOL

    I guarantee you and every single person you know could make use of a USB 3.0 port far more often.

    the resoultion is nice, but doesnt justity 1000 bucks.... Built-in speakers, microphone and HD webcam....no problem you can find a 200 monitor with that too.

    Also your macbook likely has all these things already!!!!

    LOL

    Go buy the display youve already made up your mind, this review sealed the deal for you...stop wasting your time and get down to the apple store....HURRY...there might be people camped out to buy one....run quickly!!! They are all gonna be sold and youll be left without this must have item for 2011!!!

    BWAHAHAHA
  • repoman27 - Monday, September 26, 2011 - link

    Lemme guess, you have an American car?

    I'm pretty sure Anand realized that the engineers didn't "miss" the adjustable height or swivel options. They've opted not to offer these features for some time now on both the iMac and the Apple Cinema Displays, so it's nothing new. There are plenty of sound engineering reasons why they have chosen their current design. A single solid piece of aluminum looks cool, costs less, and is way less prone to failure than something more complex. The latter reason being a lot more of an issue with a 23 pound, $999, glass clad panel than with your cheap plastic 1920x1080 TN garbage.

    I'm guessing you don't have many friends if you've never known anyone who uses FireWire. Almost everyone I know who has a Mac uses it, even if just for the occasional FireWire Target Disk Mode transfer. I use FireWire external enclosures because I do a lot of disk imaging and I value my time. I also know a lot of audio professionals who have quite a bit of FireWire audio gear. Yeah, I get it. If it's not useful to you, it has no value.

    USB 3.0 hasn't even been shipping for 2 years yet. In it's first year it had an attach rate in the PC market of 3.5%. The projections for 2011 peg it at 18%. So even though far more PC's will ship with 1394 interfaces this year than USB 3.0, you still believe USB 3.0 is vastly more useful. Have you bothered to notice that there isn't a hell of a lot of device silicon available yet, so the only USB 3.0 enabled devices currently on the market are external drives and enclosures, bulky flash memory sticks, hubs, and a couple of memory card readers? That's it man. Not to mention that the drivers are also far from polished at this point.

    You object to the bias in this review, yet you have clearly demonstrated that you have zero ability to objectively gauge the quality or inherent value of anything.
  • dsumanik - Monday, September 26, 2011 - link

    Actually i own a an american truck and a japanese motorcycle.

    ford ranger
    yamaha R1

    I also own an iphone4, and previously a 3gs... if youd like me to facetime you ill gladly prove it.

    Im not anti apple...or anandtech...the reiview was mother effing biased.. That was my point and i think you've heard it. I wouldnt have posted my initial comments otherwise....you think im imagining this all in my head????

    And im sorry but usb3 is backwards compatible...you can use it with anything from the last 10 years, 3.5% market penetration??? When was the last time you saw a PC or notebook or macbook ship without USB support?

    How you gonna install lion on your mac without USB? Doesnt apple ship it's OS on a thumbdrive??? Guarantee it would install faster on USB 3!

    That says it all.

    If FW was so great why didnt they ship it on a FW flash drive?

    Have you ever even heard of a firewire flash drive??? I think there was like some kangaru branded ones or something but they were super expensive.

    Also, with ssd's saturating the sata 3 Gbps bus already...why waste time using USB or firewire to disk image? Firewire never took off, never will, and has been succeeded by esata, USB3 and now thunderbolt..Whether you like it or not.

    But hey you can go on pretending like its not a dead interface.

    Also, some food for thought....why are you trying to change my mind about this???? I'm not going to magically "see the light of day" and agree that this monitor is the best thing since sliced cheese

    Im at peace with your reasoning..faulted in my view...but its no skin off my back...and your mind is made up....so go buy the monitor...

    Apple and anand have spoken and this is a must have item!!!

    You need to get down to the mac store like now instead of arguing with an idiot like me...the lineup is already huge and there are campers everywhere...buy it now before its too late!!

    p.s.

    Dont forget to grab a height adjustable desk!!!!
  • repoman27 - Monday, September 26, 2011 - link

    I never mentioned my feelings about this display one way or the other. I also made no attempt to change your mind in regards to whether the ATD was desirable. I joined the argument because you made several inaccurate or irrational statements.

    I also never disagreed with you about the article being biased. However, objectivity and impartiality are not the same thing. If the data presented is verifiable and accurate, whether or not Anand arrives at the same conclusions as you should be somewhat immaterial.

    I will keep bombarding you with reality regarding I/O interfaces though...

    First of all, the attach rates I included were quoted from data presented by the USB-IF and, as I clearly stated, were for USB 3.0, not all revisions.

    USB is very useful, more than 3 billion USB devices will ship this year. However, only 84 million of those will be USB 3.0 devices, all of them will still function with USB 2.0 or 1.1 interfaces, and not a single one currently offers any functionality that is unable to be duplicated by other interfaces.

    There are far more than 84 million FireWire devices in the wild that have functionality that simply cannot be achieved using USB of any revision. It's a different architecture with a different set of capabilities.

    eSATA is not a general purpose I/O, it can only be used for mass storage devices.

    USB and FireWire are very complementary and exist side-by-side. Every Mac or PC to ever ship with 1394 also has USB. If you can't use USB in a given situation due to it's limitations, you pay for the device with the FireWire controller in it. I imagine that in time Thunderbolt will supplant FireWire and sit alongside USB 3.0. Once again, if you need a device that isn't possible using USB 3.0, pony up for a device with a Thunderbolt controller.
  • dsumanik - Tuesday, September 27, 2011 - link

    psssst....

    above top secret classified news bulletin:

    Firewire's dead bro and the review was biased!
  • Constructor - Tuesday, September 27, 2011 - link

    Nonsense. FireWire isn't "dead". There are quite a few interfaces which have no alternative to using FireWire for several reasons, notably latencies among them.

    Thunderbolt is now the first possible alternative which can actually replace FireWire in every case (the sole exception: devices can potentially draw even more power from FireWire than even from Thunderbolt).

    As to "bias" in the article: The article primarily demonstrated what the tested device can actually do in practice and how the technology behind it works, complete with numerical measurements.

    All that with clear qualifications on which kinds of use cases it will support and which ones it won't.

    If you think that only thoroughly negative reports on a tested device could be "unbiased" (or maybe just when we're talking about Apple's products, specifically?), then you probably have a very distorted view on such matters yourself and little understaning what "unbiased" even means.
  • repoman27 - Tuesday, September 27, 2011 - link

    psssst... If you weren't just trolling you'd realize that I never disagreed with you about the review being biased.

    1.4 billion FireWire devices shipped... more than 200 million in 2011... Continued strong support from Apple... Yeah, death rattle, bro. 86 FireWire.
  • AnnonymousCoward - Tuesday, September 27, 2011 - link

    repoman27, dsumanik is absolutely right. If you spend $1000 on a monitor, it had better have height adjustment!

    Think of it this way; that's 4x a normal display cost. So if you buy a 4x cost car ($60k), it had damn well better have steering wheel height adjustment.

    FW flash drive, LOL. I didn't even know those existed.

    Apple didn't add proper monitor adjustments because they put style over functionality. And that's why they will always be at a disadvantage even beyond the price premium.

    As for me, I've been enjoying my monitor for about the last 5 years...it's 3" more diagonal, it has 1600 vertical pixels, full height and swivel movement, and SD/CF card readers! How about that...look how much we've advanced in 5 years.

    btw I don't get Anand's comment "These aren't just ports, they are backed by controllers physically located within the display" - is he saying they're not just fake ports and they actually work?
  • dsumanik - Tuesday, September 27, 2011 - link

    amen brotha,

    those ports arent just ports...they have controllers to back them up...

    so watch out...

    if you dont give this display the height adjustable desk it deserves...

    The TB display will download your gigabit ethernet into the HD webcam and facetime your arse into a FW drive!!

    (but only at USB 2.0 speeds!)
  • AnnonymousCoward - Tuesday, September 27, 2011 - link

    Apple should have the height adjustable desk as an accessory.

    And advertise on their site "we have controllers to back up our ports".

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