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A screen's physical aspect ratio and the individual pixels' aspect ratio may not necessarily be the same.

An array of 1280 × 720 on a 16:9 display has square pixels, but an array of 1024 × 768 on a 16:9 display has oblong pixels.

An example of pixel shape affecting "resolution" or perceived sharpness : displaying more information in a smaller area using a higher resolution makes the image much clearer or "sharper".

However, most recent screen technologies are fixed at a certain resolution, making the resolution lower on these kinds of screens will greatly decrease sharpness, as an interpolation process is used to "fix" the non-native resolution input into the display's native resolution output.