Which measurement expresses the density of pixels in a display area?

The density of pixels in a display area is referred to as pixel density. Pixel density is typically measured in pixels per inch (PPI), and it quantifies how many pixels are packed into a given area of the screen. A higher pixel density means more pixels are present in the same amount of space, leading to a sharper and more detailed image. This is particularly important for displays such as smartphones, tablets, and high-definition televisions, where clarity and image quality are crucial.

While screen resolution refers to the total number of pixels that make up the width and height of a display (for example, 1920x1080), it does not directly indicate how densely those pixels are packed. The refresh rate measures how many times per second the display can redraw the image, affecting smoothness in motion but not pixel density itself. Color gamut pertains to the range of colors a display can produce, which is important for color accuracy but not for measuring pixel density.

By understanding pixel density, users can better evaluate the potential quality of a display and make more informed decisions when selecting devices based on their usage needs and visual preferences.