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I encountered this concept: device pixel ration, some said it is the ratio between physical pixels and logical pixels.
For example iPhone has:
so does it mean that the height of each physical pixel is the screen height/960 ? And the height of each logical pixel is equal to twice the height of the Physical pixel?
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A High Definition TV with 1080p resolution is composed of two million pixels (1920 x 1080), while a 4K TV (aka Ultra High Definition) has over eight million pixels (3840 x 2160). Therefore, 4K has around four times more resolution than 1080p and produces a clearer picture.
Currently, most people recognize 4K to be the pinnacle of resolution. For laptops and computer monitors, the most reliable threshold is 3840 x 2160 resolution.
4K and 1080p refer to video frame sizes in pixels. 4K is either 4096x2160 pixels (Cinema) or 3840x2160 pixels (UHD); 1080p is 1920x1080 pixels. A screen that is 2560 pixels wide could fairly be referred to as “2.5 K” because it's close to 2500 pixels on its longest dimension.
You can take a look at the site below:
http://www.iosres.com
For iPhone 4s logical screen resolution is half of the actual resolution (not include in the site above).
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We can say that 4 physical pixels make 1 logical pixel ;-)
In other words: most recent retina displays have much more pixels than original iPhone, but to maintain compatibility and "visual size" software use 4 physical pixel to render a unique logical pixel.
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