what is display's logical resolution?

pixel screen-resolution
Blake picture Blake · Jul 31, 2014 · Viewed 16.3k times · Source

I encountered this concept: device pixel ration, some said it is the ratio between physical pixels and logical pixels.

For example iPhone has:

  • Physical resolution: 960 x 640
  • Logical resolution: 480 x 320

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?

Answer

Luca Detomi picture Luca Detomi · Jul 31, 2014

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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