Image Display
Pixel density calculator
Width in pixels
Height in pixels
Diagonal
in
Pixel density 457.3 PPI
1170×2532 on 6.1″
Dot pitch 0.0555 mm
Pixels visible? yes at phone distance
Total pixels 2.96 MP
Aspect ratio 195 : 422
Screen width 6.5 cm
≈300 PPI is the phone-distance limit
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320 × 100
Pixel density is the diagonal pixel count divided by the physical diagonal. A 6.1-inch phone at 1170×2532 is 460 PPI, well above the roughly 300 PPI at which individual pixels stop being resolvable at typical phone viewing distance.
How to work out pixel density
1 Enter the native resolution of the display.
2 Enter the diagonal in inches.
3 Read the density and dot pitch.
4 Compare against the typical viewing distance for that device class.
Phone densities have far outrun what is visually necessary, and the reason is not sharpness. Very high density gives room for subpixel arrangements like PenTile that trade real subpixels for panel efficiency, and it allows clean integer scaling of interface layouts across a range of physical sizes. A 460 PPI phone is not visibly sharper than a 380 PPI one at arm length; it is easier to build a consistent interface on.
Questions
About 300 PPI at 30 cm, which is why that figure gets quoted for phones. It falls with distance.
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300 × 250
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