La resolución de pantalla es el número de píxeles que puede ser mostrado en la pantalla. Viene dada por el producto del ancho por el alto, medidos ambos en píxeles, con lo que se obtiene una relación, llamada relación de aspecto. En esta relación de aspecto, se puede encontrar una variación, está de acuerdo a la forma del monitor y de la tarjeta gráfica. Se pueden diferenciar dos tamaños de pantalla diferentes: \n* Tamaño absoluto: la anchura y altura de la ventana del monitor, medido generalmente en pulgadas. Depende del monitor. \n* Resolución o tamaño relativo: viene determinada por el número de píxeles que se muestran en la ventana del monitor, siendo el píxel la unidad mínima de información que se puede presentar en pantalla, de forma generalmente rectangular. Depende de la tarjeta gráfica.

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The display resolution or display modes of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube (CRT) displays, flat-panel displays (including liquid-crystal displays) and projection displays using fixed picture-element (pixel) arrays. It is usually quoted as width × height, with the units in pixels: for example, "1024 × 768" means the width is 1024 pixels and the height is 768 pixels. This example would normally be spoken as "ten twenty-four by seven sixty-eight" or "ten twenty-four by seven six eight". One use of the term "display resolution" applies to fixed-pixel-array displays such as plasma display panels (PDP), liquid-crystal displays (LCD), Digital Light Processing (DLP) projectors, OLED displays, and similar technologies, and is simply the physical number of columns and rows of pixels creating the display (e.g. 1920 × 1080). A consequence of having a fixed-grid display is that, for multi-format video inputs, all displays need a "scaling engine" (a digital video processor that includes a memory array) to match the incoming picture format to the display. Note that for broadcast television standards the use of the word resolution here is a misnomer, though common. The term "display resolution" is usually used to mean pixel dimensions, the number of pixels in each dimension (e.g. 1920 × 1080), which does not tell anything about the pixel density of the display on which the image is actually formed: broadcast television resolution properly refers to the pixel density, the number of pixels per unit distance or area, not total number of pixels. In digital measurement, the display resolution would be given in pixels per inch (PPI). In analog measurement, if the screen is 10 inches high, then the horizontal resolution is measured across a square 10 inches wide. This is typically stated as "lines horizontal resolution, per picture height;" for example, analog NTSC TVs can typically display about 340 lines of "per picture height" horizontal resolution from over-the-air sources, which is equivalent to about 440 total lines of actual picture information from left edge to right edge.

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