If 640x960 is the most the naked eye can see....

Discussion in 'iPhone' started by 0000757, May 16, 2012.

  1. 0000757 macrumors 68040

    Dec 16, 2011
    If 640x960 is the most the naked eye can see, why are phones being equiped with 1280x720 resolution screens. I've looked at one, the LG Spectrum, and I can't see ANY difference in screen quality. In fact, the iPhone looked slighty better! Can someone offer an explanation?
  2. FSMBP, May 16, 2012
    Last edited: May 16, 2012

    FSMBP macrumors 68020


    Jan 22, 2009
    That's not right at all. You're confusing resolution with PPI.

    EDIT: Further explanation: According to Apple, you cannot tell pixels apart on a resolution of 960x640 on a 3.5" screen (accounting for the distance you would hold the screen away from your face and its PPI). Putting the same resolution a 6" screen would have less pixel density and would be able to see individual pixels. Therefore, the larger the screen, the higher the resolution it needs to maintain an acceptable PPI that would be hard for people to see individual pixels.
  3. DroidRules macrumors 65816

    Aug 10, 2010
  4. Tarzanman macrumors 65816

    Jul 16, 2010
    Its called marketing, and you've fallen for it hook, line, and sinker.
  5. Bugeyeblue macrumors 6502a


    Mar 27, 2011
    It also seems to me that most of the android phones are using some variation of amoled screens, which, to me, always look more pixelated than LCD screens.
  6. 0000757 thread starter macrumors 68040

    Dec 16, 2011
    Thank you; the only helpful post answering my question.

    I understand now.
  7. kdarling macrumors P6


    Jun 9, 2007
    First university coding class = 47 years ago
    Read this:



    You've heard of "print quality", right? 300 dpi? Similar kind of thing. At 12" away, a "normal" person cannot see the ink dots.

    It's all about how much angle that a visual change takes up. So, for example, if you put your eyes 1" away from a screen, a "retina" screen would need over 3500 ppi since each pixel set is bigger to your eye at that short distance.

    On the other hand, at a football field length away, pixels could be 1" square and be close to "retina", because they also subtend the same small visual angle. (Imagine a big screen TV at a ball game)

    It's like a cone that gets bigger the further away your eye is.
  8. iEnvy macrumors 65816


    Jun 25, 2010
    Basically.. (resolution)/(screen size)=DPI

    Higher the screen size, the higher the resolution needs to be for a higher DPI.
  9. kdarling macrumors P6


    Jun 9, 2007
    First university coding class = 47 years ago
    That's true for the Pixels Per Inch, but the "retina" term involves distance as well:

    At 10", you need 357 PPI to be called "retina".
    At 12", you need 300 PPI.
    At 24", you need 148 PPI.

    At 100 yards, you only need 1 PPI.

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