Sony mobile made progress with their displays hardware with the Z2. Their previous panels had sub-standard viewing angles with no benefit in contrast ratio

So what they have now is a decent IPS panel, using a blue led as backlight plus phosphors to alter the wave-lengths generated, which results in a wide gamut display with satisfying power efficiency.

Conceptually, having a wider gamut than the common Rec.709 and sRGB is interesting because the human eye can perceive colors so much more intense than sRGB gamut, around in an approximate fashion since CRT monitors.

But let's hold back here: what's a display?
It's a rendering device, reproducing colors previously encoded into numbers or voltages in the old days.

So a good display is what reproduces the colors as they're supposed to. Typically, as the graphic artist intended or as a camera encoded them from what hit its sensor.

As a result what's desirable is both a camera (or artist) and the display agreeing on how to record, encode and present again those colors.
Well that's the basics of display calibration.

Sony has an interesting technology, allowing to reproduce more intense colors and most people craves those, they produce emotions.
But today's content usually are not encoded in a way that can represent those colors intensities.
It's just not here anymore!
Colors that are in nature, that also can be perceived by your eyes but can't be stored in the mathematical encoding of sRGB (computers) or Rec.709 (HDTV) gamut (both share the same)

Sony has this display on the Z2 but unfortunately didn't implement anything to display images according to how their colors are encoded.
Instead, they'll simply let the display stretch colors intensities, and also show the wrong color hues because the Z2 panel RGB primaries are not aligned with sRGB gamut.

That's the typical issue when you're lacking color management.
Instead of converting a color space to another, you're not processing anything and show un-corrected colors.

And then here comes the marketing department, who made this page that totally baffles me by the quantity of bulcrap it contains.
It's pretty much feeding readers lies about color reproduction and accuracy to convince them the oversight is actually not only a good thing, but also right and accurate.

Quoting:
With IPS technology, the Xperia Z2 offers an improved viewing angle. So you get super sharp images and accurate colours, no matter which angle you’re looking at your device from.

All things considered, if you compare to the Xperia Z or Z1 yes the colors are indeed more accurate.
It doesn't make Z2 display a color-accurate display tho.

TRILUMINOS™ technology uses LEDs, which emit purer reds and greens, creating a brighter and more uniform light that captures the true colours of the source. From lush landscapes, to natural skin tones – Sony delivers a significantly wider colour range. So you can view every moment in astonishingly authentic colour and breathtaking quality.

Wait wait wait.
Sony, are you really saying that the display is actually a camera? capturing the true colours of the source.
A camera captures colors. Not a display.
See, that's the rhetoric used to pretend that the display knows (!) what were the colors when captured, and thus can reproduce them accurately.
Needless to say, it's complete nonsense.
Then continuing on, Sony tells you the display renders authentic colour

Science check: that's absolutely wrong. Remember I told you sRGB gamut is far from covering what your eyes can perceive. So if your camera records image in sRGB, those intense colors are gone. Like an intense red will be recorded as a less intense red, that's all.
So how could a display know what the authentic colors were.
Was the display here with you? What does that even means.
No, the display will only render colors encoded to be a specific tone and intensity to another color. Because.
Of course it won't be the real color, unless you get 16.7 millions against one lucky, assuming this color was even part of Z2 reproducible colors.

This new innovation combines red and green phosphor with blue LEDs and customised colour filters to produce a brighter and more uniform light. Capturing true colours without the risk of oversaturation.

The marketing here using a formulation optimized to trigger the placebo effect. And believe me placebo (at any price point) sells with almost no limit when it's about display or sound quality.
Even medicine. But people rightfully take this a little bit more seriously ­čÖé
So yes colors are over-saturated, it's a measurable fact.
But maybe if Sony tells you they're not you'll believe them. No harm trying right?

The Intelligent Image Enhancer reproduces the vividness of the image in its original colour

Again, same thing. Boosting colors not as selectively as described here won't get you anywhere near the original color.
More nonsense.

If you actually watch video content today on a Z2, the color processing might make you uncomfortable.
They take standard content, stretch colors to the wide gamut of the display, and on top of that boost colors some more.
The result looks simply ridiculous, even on skin tone which is a big no-no.

But well, this is Sony's marketing so nothing new here, I think it's a tradition of theirs for consumer products.

Personally, I really don't like abusive usage of "color accuracy" mentions.
That's why I'm working on measurement tools allowing to verify claims, because color is actually a science.
Also, there's a lot of progress to make thanks to wider gamut displays.
Those are undoubtedly the future, but today's ridicule usage made of them mostly discredits their benefits.

#supercurioBlog #color #display #critic #marketing



Xperia™ Z2
Sony’s best phone camera is the Xperia Z2 which features a 20.7 MP camera and 4K video recording – all packaged inside a gorgeous aluminum frame.

Source post on Google+

Published by

Fran├žois Simond

Mobile engineer & analyst specialized in, display, camera color calibration, audio tuning

8 thoughts on “Sony mobile made progress with their displays hardware with the Z2. Their previous panels had sub-standard viewing angles with no benefit in contrast ratio”

  1. I respect, and agree with, the fact that you call them out on the fact that their display isn't good (or not as good as they claim).

    But nitpicking over marketing claims and such, that's kind of pointless. It won't make it stop, or anything…

  2. +Bas Verhoog Yes note that I'm not saying "good" or "not good", it's more subtle than that.
    It's like the other day when ComCast and TW were publishing an ad saying that their merger was a guarantee for Net Neutrality.
    As color accuracy is my specialty, it makes me react. It doesn't require too much effort, I can write/talk about that all day.

    When marketing combines intellectual dishonesty with large reach, I think it's the responsibility of those who have the actual knowledge to debunk claims and explain the facts and how things work.
    If there's need for a fight between marketing BS and science, well okay bring it on ­čÖé
    I'm no marketing department but certainly have other tools at my disposal.

    Once people read or hear both versions, they can make up their mind and decide by themselves what it is about.

  3. +François Simond I agree with you. You points really made me rethink the whole stuff.

    It sunfortunate marketing goes to great length to use "whatever-luminous" and the like in trying to say something that doesn't actually bring any new experience, rather an abysmal experience to the viewer.

    I was telling some friends the other day that, 4K screen on a 5 inch screen some 35+ centimeters away from the eyes is useless as natural biology of the eye will prevent one from seeing the actual details. Meanwhile, marketers don't factor in the distance issue when marketing, only to say you enjoy great details. Gimmick 4K.

    They found it hard to understand the whole science behind, that its not only about what dimension is available, however what the human eye can see at what distance is what matters

  4. +Jules Archinova yes, for a wide gamut calibration is required like for every display but also color management, which allows to display with the right color intensities and hues content encoded for different gamut.

    Imagine if you want to display both Rec.709 (HDTV) and Rec.2020 (Ultra HDTV) content correctly on the same display.
    http://upload.wikimedia.org/wikipedia/commons/e/ef/CIExy1931_Rec_709.svg
    http://upload.wikimedia.org/wikipedia/commons/b/b6/CIExy1931_Rec_2020.svg
    Regardless of it's gamut coverage, there has to be conversion for one, the other or both ­čśë

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