Pixel density is an attribute of a display device measured as number of device pixels within one inch of screen space, either in horizontal or vertical direction. Reference pixel size varies with typical intended user device viewing distance, it becomes larger if the viewing distance increases(TVs) or smaller if viewing distance decreases as in case of handheld devices such as smartphones or tablets. Visual angle is therefore about 0.0213 degrees and at arm’s length distance of reader from display, one reference pixel corresponds to about 0.26 mm (1/96 inch). Reference pixel gives physical size to abstract notion of pixel as point of visual information.Īs defined by W3C(World Wide Web Consortium), reference pixel is the visual angle of one pixel on a display device with a pixel density of 96dpi(classic desktop monitor) and a distance from the reader of nominal arm’s length of 28 inches. Thanks to human perception of colors, combinations of different shades of these three primary colors give single screen pixel way to reproduce all other colors in color gamut.Ĭontemporary smartphones and tablets may use different number of subpixels per pixel( PenTile matrices) but principle stays the same. Pixel(picture element) is a smallest controllable element of a display device and therefore pixels are basic building blocks of any image you see on screen.Įach pixel is divided into three subpixels, each showing one color of varying intensity/brightness: red, green and blue(RGB). Some standard display resolutions and their market names/acronyms:ġ280 x 720 (720p, HD, HD Ready, Standard HD)Ģ560 x 1440 (1440p, Wide Quad HD, Quad HD, WQHD, QHD)Īspect ratio of a display device is a ratio between the width and the height of the screen.
Furthermore, more viewable content can fit onto a higher resolution screen. The higher the display resolution is, the sharper and clearer displayed content can be because a higher resolution monitor will be made up of more pixels than a lower resolution monitor. It is usually noted in a format of width x height, for instance: 1920 x 1080 means the width is 1920 pixels and the height is 1080 pixels which in this case would give total of 2,073,600 pixels on screen. These word sizes range from a nibble to more than 128 bits. Word size = 16 bits (or two bytes).Screen or display resolution of electronic visual display device is the number of individual pixels in each axis that can be displayed on screen.The word size for a computer is the number of bits that the central processing unit (CPU) of a particular computer can handle at one time.The display resolution or display modes of digital television, computer monitor, or display device is the number of distinct pixels in each dimension that can be displayed.The smaller the dot pitch, the sharper the picture. This distance is very small and is typically measured in fractions of millimeters. It measures the distance between the dots used to display the image on the screen.It is a measurement that defines the sharpness of a display.Viewable image size is usually measured diagonally, but the actual widths and heights are more informative since they are not affected by the aspect ratio in the same way.
Monitors usually have the aspect ratio 4:3, 5:4, 16:10, or 16:9.