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A Professional Perspective On Apple's Retina Display

Reader BWJones, who is a retinal scientist, sends in this detailed analysis of the iPhone 4's "retinal display," which includes photomicrographs of the display pixels of earlier generations of iPhone as well as the iPad. Well worth a read. "... as you can see from these images of the displays I captured under a microscope, the pixels are not square. Rather they are rectangular, and while the short axis is 78 microns, the long axis on the iPhone 4 pixel is somewhere in the neighborhood of 102 microns. ... While [an earlier analysis by] Dr. Soneira was partially correct with respect to the retina, Apple's Retina Display adequately represents the resolution at which images fall upon our retina. ... [I] find Apple's claims stand up to what the human eye can perceive."

36 of 346 comments (clear)

  1. Too literal by DoofusOfDeath · · Score: 5, Funny

    Apparently we should never ask a scientist, "How do you like *them* Apples?"

    1. Re:Too literal by rolfwind · · Score: 4, Insightful

      "It's meaningless hype, good for marketing."

      That pretty much describes every single one of apple's products.

      While I don't think Apple products are magical, people who don't understand why they sell (or why Nintendo products sell) are fixated by feature lists but kinda miss out on the whole dimension of actual usability of those features.

    2. Re:Too literal by khellendros1984 · · Score: 4, Informative

      No one hears frequencies that high. People that claim to do so are generally hearing much lower frequency harmonics of the sound that they claim to hear. The commonly quoted maximum human-audible frequency is around 24kHz. Secondly, 3840 X 2400 is the largest display resolution I could find any mention of (aside from multi-display arrangements). You could find a display with over 3x the pixel count of a 1080p display, but not with 3x the resoution. That's a 22-inch display by Toshiba, which means it's about 2/3 the dpi of the iPhone screen. Essentially, you shouldn't be able to see the pixels from over 2 feet away, 3 feet if you have excellent eyesight.

      So....can I have your autograph, Kal-El?

      --
      It is pitch black. You are likely to be eaten by a grue.
  2. B-b-b-but I thought Apple was a marketing company? by seanadams.com · · Score: 4, Insightful

    People love to whine about all the Apple stories. I would defy any of them to submit their own stories about all the other computer companies that are breaking new ground with this type of research. Do you think Dell for example has a team of physics PHDs figuring out these technologies and pushing their vendors to tool up for them? No, THOSE are the guys just packaging off-the-shelf reference designs. Or waiting for the exclusivity on Apple's deal with [insert obscure pacific rim manufacturer here] to expire so they can make a similar looking phone a few years later.

  3. Fantastic display by Anonymous Coward · · Score: 5, Funny

    And since you can't actually HOLD the fucking phone to make calls, looking at it is all you're going to do with it.

  4. okay, it's silly marketing, but by mattdm · · Score: 4, Insightful

    I'm really happy to see screen resolution getting attention. My Vaio U101 had a pretty decent ppi, but it's long in the tooth and that that class of system -- always a niche -- has basically been displaced from the market by netbooks. And I'm sick of netbooks with low-res screens. Hopefully this will catch on as an important feature.

    (I'm double-sick of people saying: "But if there's a higher-resolution screen, everything gets tiny and hard to see. So low-res is better for small screens." Ahhhh! You're doing it wrong!)

    1. Re:okay, it's silly marketing, but by Timmmm · · Score: 4, Interesting

      I agree, imagine if we had computer screens with this pixel density! We could finally have smoothly scalable *and* sharp fonts. It would also stop the need to add hinting to fonts, which is apparently really tedious and difficult.

  5. Apple is a design company by Anonymous Coward · · Score: 3, Informative

    People love to whine about all the Apple stories. I would defy any of them to submit their own stories about all the other computer companies that are breaking new ground with this type of research. Do you think Dell for example has a team of physics PHDs figuring out these technologies and pushing their vendors to tool up for them? No, THOSE are the guys just packaging off-the-shelf reference designs. Or waiting for the exclusivity on Apple's deal with [insert obscure pacific rim manufacturer here] to expire so they can make a similar looking phone a few years later.

    Do you think Apple has a team of physics Ph Ds figuring this out? (Hint: no.)

    Apple deserves credit for identifying this technology and bringing it to market. That's a worthwhile and necessary pursuit, no matter what the Slashdot detractors say. But Apple is not doing groundbreaking research into materials science or manufacturing here; it's merely bringing them to market in an attractive way.

    1. Re:Apple is a design company by seanadams.com · · Score: 4, Insightful

      I'm guessing you have never actually worked with Asian manufacturers. New stuff doesn't just fall out of the sky for whoever is lucky enough to "identify" it. For a customer the size of Apple it is a very close partnership and seldom does the manufacturer fully own the resulting technologies. So either you help them develop the next big thing and you get some degree of exclusivity, or you wait for someone else to pioneer it and then you get it a few years later.

  6. We knew this years ago ... by gig · · Score: 5, Interesting

    ... which is why "laser quality" is 300 dpi. We knew fax looks like shit because it's 200 dpi. It's why chemical photo prints are almost 300 dpi. Why print artwork is done at 300 dpi. The "300 dpi pleases the retina" thing is like 25 or more years old. 300 is the most important point on the resolution scale.

    But of course if Steve Jobs says it, then the Nerd Police have to say it's wrong. If it didn't happen in a video game or a Windows patch then they don't fucking know. As if Apple doesn't know about graphics and publishing!

    1. Re:We knew this years ago ... by lxs · · Score: 5, Insightful

      There's a huge difference between 300dpi in printing where your C,Y,M or K is either on or off, and 300dpi in systems where the C,Y and M or your R, G and B come in 256+ levels. (chemical photo printing and color displays respectively)

      Print artwork is vastly inferior to a good photo print at the same resolution.

    2. Re:We knew this years ago ... by Anonymous Coward · · Score: 5, Informative

      .. which is why "laser quality" is 300 dpi. We knew fax looks like shit because it's 200 dpi. It's why chemical photo prints are almost 300 dpi. Why print artwork is done at 300 dpi. The "300 dpi pleases the retina" thing is like 25 or more years old. 300 is the most important point on the resolution scale.

      As someone that used to work for an agency:

      300 DPI represents an reasonable economics tradeoff between accuracy and cost. You can have 1270 DPI (professional photo typesetters run that high), but how much do you want to pay for it? Those machines are $500k+. And yes, your eye can tell the difference between 300 DPI and 1270 DPI.

      Artwork developed by print agencies is done at 300 DPI and no higher because of limitations on file transfer size and professional printer RIP speed. Trust me, if an 8" x 10" photo could be squashed into 3-5MB and rasterized in a short amount of time at 1270 DPI, there would be printing equipment and printers offering that as a service overnight.

      Finally, standard 35mm film is around 10,000 DPI, dude.

    3. Re:We knew this years ago ... by omnichad · · Score: 5, Insightful

      Finally, standard 35mm film is around 10,000 DPI, dude.

       
      35mm film is a storage format, not a display format. Yes, blowing that up to an 8x10 still gives you something like 1,000 dpi. But the 10,000 dpi figure is meaningless unless you like looking at 35mm wide prints at 12 inches away.

    4. Re:We knew this years ago ... by jedidiah · · Score: 3, Insightful

      It's good that someone brought up laser printers because I distinctly remember when the 600dpi ones came out.

      They were a distinct visible improvement over the previous generations of 300dpi ones. ...but all this really boils down to is the fact that you've got what amounts to a fairly
      respectable desktop screen that's been shrunk down the the point that you can't see
      anything on it because everything is so small. This whole "retina nonsense" is just a way
      to spin the smallness of the iphone screen into something positive.

      --
      A Pirate and a Puritan look the same on a balance sheet.
    5. Re:We knew this years ago ... by Pandrake · · Score: 4, Informative

      Hmmm, I also used to and *currently* work in the print industry. I don't have time to explain the relationship between DPI and LPI when it comes to reproducing halftones in print, plus the effects of the only three different kinds of printing technology (ink based, toner based, and ink jet based) *and* the effect that has on different kinds of paper stock.

      Essentially, the "sweet spot" for color halftones is 340 dpi when you have the option of a very high linescreen with very low dot gain. There's sort of a formula for dpi, which is 2.5 X the linescreen (LPI); but it cannot be followed exactly if you're worried about tracking and other quality issues. 300 dpi is a nice round number that makes for "easy" to email files as well as a good standard for target resampling in PDFs and the like. Anything higher than 300/340 dpi and you'll have to have an LPI so high in order to prevent banding you can't keep the dots on the page (again, depending on which printing technolgoy you use). If you're LPI is too low it looks like the old newspaper photos, and also runs the risk of rosetta morie patterns being visible if the angle of the 4 inks (if using only 4 inks) isn't adjusted properly.

      For toner and ink jet based printing, it's easier to get away with as little as 150 dpi for color photos since the LPI is moot at a certain point where dot gain and near continuous tone transfer of pigment is possible.

      For greyscale halftones, you usually want 600 dpi for SWOP printing; again, it's not forumulaic, since that high of resolution may or may not result in banding depending on the LPI and the distance-to-amount of gradiation.

      For black and white, such as text, you want the dpi to be as high as your output dpi - so you don't see any of the jagged edges between the points of black and the white of the paper underneath.

      Finally, standard 35mm film is around 3,200 dpi depending on the emulsion chemistry.

    6. Re:We knew this years ago ... by Bigjeff5 · · Score: 4, Insightful

      They were a distinct visible improvement over the previous generations of 300dpi ones. ...but all this really boils down to is the fact that you've got what amounts to a fairly
      respectable desktop screen that's been shrunk down the the point that you can't see
      anything on it because everything is so small.

      There is such a thing as "scaling" - you can make an image bigger and pack more pixels in it. If it's a vector image, you keep the sharpness the small pixels provide while maintaining an easy to read screen.

      Furthermore, if you're having trouble seeing all small devices, chances are it's your eyes that are the culprit. See, as we age, the lenses in our eyes harden and loose the ability to adjust the focal length. This means people tend to become a little far-sighted, and require reading glasses to see any detail within arm's length. Anybody in that situation needs reading glasses for small, detailed devices, period.

      Young people with flexible eyes do not have a problem with it. My eyes are still young, and I was pleasantly surprised at how comfortable reading on my HTC Hero is. That's with a piddly 181ppi, barely more than half of the iPhone 4's.

      In other words, if your OS isn't stupid then increasing the resolution only makes things clearer. People are used to higher resolution making everything tiny because Windows made some retarded moves early on, and has been stuck with them since. There is no real need for it.

      --
      Security is mostly a superstition... Avoiding danger is no safer in the long run than outright exposure. - Helen Keller
  7. Truly a magical device. by know1 · · Score: 3, Funny

    This innovation sure beats that whole punch card technology.

    1. Re:Truly a magical device. by geekoid · · Score: 3, Funny

      Punch card: the most important part is the part that's not there.

      --
      The Kruger Dunning explains most post on /. http://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect
  8. Re:B-b-b-but I thought Apple was a marketing compa by geekoid · · Score: 4, Informative

    Why would dell? they don't make electronics. They build computers byu assembling other peoples electronics.

    I have submitted stories about real ground breaking technologies from:
    Intel
    Giga-Byte
    Nasa
    Chevy
    IBM
    MS.
    and many, many others. I stop submitting 2 years ago because I had not had a submission accepted since 99.

    Now, I don't mind the apple stories. It's not like this is a limited space newspaper.

    BTW that tech isn't as ground breaking as you seem to think. It's like there isn't much there in regard to new tech, so people are glomming onto and straws they can grasp to justify waiting hour to buy a product that they could walk in and buy in 2 weeks. Hell it might even be fixed by then.

    --
    The Kruger Dunning explains most post on /. http://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect
  9. So it's not retina resolution...big deal by Matey-O · · Score: 3, Informative

    So I played with one briefly yesterday. I thought, "oh, this is nice, it's about the same speed as my 3gs...this screen doesn't LOOK a whole lot better." Then I realized I really needed to clean my glasses. With my glasses off, and the screen 6 inches from my nose, it looks AWESOME. From any distance away, through my myopic eyes, dirty glasses, and the pollutants in the air, it's much better than it needs to be.

    --
    "Draco dormiens nunquam titillandus."
  10. Re:B-b-b-but I thought Apple was a marketing compa by jeffmeden · · Score: 4, Insightful

    This is just buying into the hype. Apple came out with a new phone that happens to have the highest pixel density yet (325 ppi). The next closest is the Motorola Droid at 265 ppi. About 20% higher than the competition... Not really a groundbreaking move by Apple, just them taking another step toward higher density displays. It's what any company would have done. Where was the news story when the Droid came out, besting Apples then best display on the 3GS (of 163ppi) by 40%?

    Disclaimer: I don't have an Iphone, or a Droid, but I do have a brain and I tend to use it when I smell hype.

  11. Apple is a marketing company by betterunixthanunix · · Score: 5, Insightful
    1. High pixel resolutions are not groundbreaking.
    2. Apple did not invent any of the technology in the iPhone and does not have a team of PhDs working on designs
    3. Apple is great at designing and marketing products that feature the inventions of other people
    4. IBM, Intel, AMD, etc. all design new technologies
    5. Have a nice day
    --
    Palm trees and 8
    1. Re:Apple is a marketing company by jollyreaper · · Score: 4, Interesting

      High pixel resolutions are not groundbreaking.
      Apple did not invent any of the technology in the iPhone and does not have a team of PhDs working on designs
      Apple is great at designing and marketing products that feature the inventions of other people
      IBM, Intel, AMD, etc. all design new technologies
      Have a nice day

      Apple's an integrator. They assemble cool parts made by others, add some magic sauce, and generally come up with something interesting. Another company working with the same parts might come up with something less compelling. You know, you could compare Apple to a chef. It's not like he's got a proprietary lock on ingredients like meat and vegetables but a good chef can do things with those ingredients that lesser chefs can't touch and people are left guessing as to what he does with the spices to give the food his characteristic zing. You know, the chef comparison really works. Apple is the Soup Nazi. Everyone wants his soup because it's the best on the block but you are in no position to argue with him about anything. You accept what he gives you how he gives it to you with no debate. You complain, "no soup for you!"

      The position Apple's in is that it has to maintain standards and be the best out there or else people will stop putting up with Soup Nazi tactics.

      --
      Kwisatz Haderach
      Sell the spice to CHOAM
      This Mahdi took Shaddam's Throne
  12. Re:Units of measurement by atrain728 · · Score: 3, Informative

    It said "2 meters".

    What is this "meter" you speak of .. I only know of the metre. Unless you were using some new fangled musical notation that I don't know of.

    http://en.wikipedia.org/wiki/Meter

    The metre (or meter), symbol m, is the base unit of length in the International System of Units (SI).

    http://en.wikipedia.org/wiki/American_and_British_English_spelling_differences#-re.2C_-er

    In British usage, some words of French, Latin, or Greek origin end with a consonant followed by -re, with the -re unstressed and pronounced /r/. Most of these words have the ending -er in the United States. The difference is most common for words ending -bre or -tre: British spellings centre, goitre, kilometre, litre, lustre, mitre, nitre, reconnoitre, saltpetre, spectre, theatre, and titre all have -er in American spelling, as do calibre, fibre, sabre, and sombre.

    Happy to clear that up for you.

  13. Re:B-b-b-but I thought Apple was a marketing compa by Low+Ranked+Craig · · Score: 5, Funny

    I like Apple, but let me be the first to say they they do need a team of physics PHDs to work on antenna design...

    --
    I still cannot find the droids I am looking for...
  14. Re:B-b-b-but I thought Apple was a marketing compa by Trufagus · · Score: 4, Interesting

    Hummm, I thought IPS was developed by Hitachi? And I assumed that Apple just brought this to market (and probably did some final work on it). So yes, I have exactly the attitude to Apple that you think I do.

    Relative to other companies their size Apple has a massive marketing budget and a puny R&D budget. Recently we've been hearing about how Apple has grown bigger then MS, but their R&D budget was 10% of Microsoft's in 2009. Investors have became angry with other companies for spending so much on R&D and they point to the example of Apple that makes better much money by spending their money on marketing.

    In the case of this display, Apple's problem was that they couldn't get Samsung's Super AMOLED display. If they had, I"m sure you would be telling us about Apple incredibly ground-breaking R&D on reducing the power consumption of a display. Apparently though, now that the iPhone 4 is using IPS, we've decided that 'retinal' resolution is the key and giving thanks to Apple for inventing that.

  15. Re:That's one huge display! by clone53421 · · Score: 3, Informative

    78 um and 102 um. They used the Greek letter Mu, which Slashdot helpfully strips out.

    --
    Alexander Peter Kristopeit bought his basement from his mommy for one dollar.
  16. Re:What about other non-apple devices? by bhtooefr · · Score: 3, Interesting

    The LG CYON LU1400 is where it's at.

    A dumbphone (granted, with a TV tuner) with 3 PPI more than the iPhone 4, in 2008. (800x480, 2.8")

    http://www.displayblog.com/2008/12/25/lg-cyon-lu1400-28-dmb-tv-phone/

  17. Droid at 265 ppi was no big deal. by Petersko · · Score: 5, Insightful

    "Where was the news story when the Droid came out, besting Apples then best display on the 3GS (of 163ppi) by 40%

    Didn't Droid come out 7 months ago? The only way it would have been a story is if it hadn't been able to top the resolution that the iPhone has had since what... 2007?

    Note that Apple didn't market their device as having higher resolution than a competing device. They are marketing it as being so high that it no longer matters.

  18. Re:FaceTime feature is rather scary by Sockatume · · Score: 3, Informative

    The face camera isn't high-res. I think it's something like 640x480, standard sort of webcam view. So, uh, I guess I'm saying you shouldn't blame the phone here, you'd look like that on regular old video.

    (I tried to come up with a more polite way of putting that. Sorry!)

    --
    No kidding!!! What do you say at this point?
  19. Re:Units of measurement by wjsteele · · Score: 5, Interesting

    Some say it's impossible to see a target that small, but I used to bullseye womp rats in my T-16 back home. They're not much bigger than two meters.

    Bill

    --
    It's my Sig and you can't have it. Mine! All Mine!
  20. Re:B-b-b-but I thought Apple was a marketing compa by sjonke · · Score: 3, Insightful

    Why does this make the Retina Display simply hype, as opposed to something pretty impressive? I don't recall Motorola making any mention of their display's ppi. Apple has made a mention of it and made it clear what this brings to the table for the user - a display that produces images that look like print. What exactly should they have done? Not made it? Not mentioned it? So, yeah, Apple is a lot smarter then Motorola, and the Droid had previously bested the iPhone = 3GS's display ppi. Congrats on that.

    --
    --- What?
  21. Re:What a pack of lies by onefriedrice · · Score: 3, Insightful

    On my droid I can run SecondLife, Pandora, another radio station from anywhere, surf the web, and watch videos - all at the same time. All of these programs can take input or provide information at the same time. Nice try Apple.

    I think you've hit on something important here and a reason why the iPhone does so well despite its obvious limitations: Average people don't care whether or not their phone can do all that at the same time because they would never use it like that. On the other hand, battery life is a concern shared by just about everyone. In other words, just about everybody nowadays is very aware of what the iPhone is and what it can and can't do, yet they still swamp Apple's servers on pre-release day. Given the popularity of their prior models alone, I take this to mean that multitasking on a phone isn't as important to most people as it apparently is to you.

    --
    This author takes full ownership and responsibility for the unpopular opinions outlined above.
  22. Re:B-b-b-but I thought Apple was a marketing compa by Bigjeff5 · · Score: 5, Informative

    It's impressive, but it isn't super impressive. The Toshiba Portege G900 already had a screen at 313ppi, and Sony Erickson X1 is 312ppi.

    What makes it newsworthy, is Jobs said (I paraphrase) "It's as good as the human eye can perceive." That's why he named it the "retina display".

    A scientist with a Ph.D. came along and called bullshit, saying that the human retina can perceive pixels much higher.

    The Ph.D. in this article respectfully disagreed, and said the previous scientist:

    A.) Used the wrong figure for retinal resolution when he made his calculations (0.5 arcminutes instead of the 0.78 arcminutes established by a recent, authoritative study) and

    B.) Failed to factor in losses in the optics of the human eye regarding how much light will actually hit the retina.

    With A fixed and B factored in, the scientist concludes that the practical limit of the human retina (what it can distinguished given the amount of light that hits it) is 286ppi when held at 1 foot away from the eye (the ideal distance for viewing detail). The iPhone is well above this, at 326ppi, which means Jobs was right, and the name is apt.

    It's worth noting that there are quite a few phones that beat the 286ppi limitation, but the iPhone has the highest.

    Basically it looks like we don't need any higher resolution than what the iPhone and others have achieved, anything more would be pointless.

    That, to me, is very impressive.

    --
    Security is mostly a superstition... Avoiding danger is no safer in the long run than outright exposure. - Helen Keller
  23. Really? by bashibazouk · · Score: 4, Insightful

    Or so the apple haters would have you believe...

    2009 apple advertising was 1.37% of revenue or $500 million

    Microsoft the same year: 2.4% of revenue or 1.4 billion
    Dell: 1.3% and 811 million.
    RIM: 2.4% and 337 million

    Sounds to me like they are less of a "Marketing" company and more of a hardware company putting out better selling products...

  24. Re:B-b-b-but I thought Apple was a marketing compa by Wovel · · Score: 4, Insightful

    It is also about the implementation of the technology. Technology in and of itself is useless. Creating new, even useful technology is certainly praiseworthy. Taking technology and deploying it in a useful manner is also praiseworthy.

    Feature lists are for short-sighted nerds. Apple is successful because they try to keep the feature list shorter and not longer.

    There would be no Android phone, as we know it now, without Apple, there may have been a phone, it would have looked just like the Blackberry and Windows Mobile crap that came before it. People who try to discount Apple's contribution to the smartphone industry or call it "marketing fluff", only show how utterly technology ignorant they truly are.

    Apple completely transformed the smart-phone industry. There is a day when the look, feel, and function of smart phones all changed. That day was the day Apple announced the iPhone. You don't have to love Apple, or even be a fan. Writing off their success as marketing just makes you look ignorant.