display resolution
The screen resolution is decisive for the detail recognizability of representations. It indicates how many adjacent pixels can be recognized and distinguished separately. It applies equally to the horizontal as well as the vertical, whereby a rectangular pixel is assumed for viewing. The screen resolution, which essentially depends on the screen size, is specified in the number of pixels in the horizontal and vertical direction (H x V).
Various graphics standards and de facto standards exist for graphics cards and displays, which are based on Video Graphics Array( VGA) and Extended Graphics Adapter(XGA) and range in resolution from 160 x 120 pixels for QQVGA to 3,200 × 2,400 pixels for QUXGA. The image sizes are also correspondingly different, ranging from 19,200 to 7.68 million pixels.
There is also High Definition Television( HDTV) and Large Screen Digital Imagery( LSDI). HDTV with a resolution of 1,920 x 1,080 pixels and LSDI with a resolution of 7,680 x 4,320 pixels, which corresponds to 33.18 million pixels and the resolution of Ultra HDTV( UHDTV).
In order to achieve an optimal graphic display, the graphic to be displayed must be adapted to the resolution capacity of the screen, possibly also by means of scaling. However, the display of scaled web pages quickly reaches its limits when a web page that can be viewed on a notebook with a high resolution has to be viewed on a tablet or smartphone. The screen resolutions and image page formats of mobile devices militate against scaling. In this case, the website layout must be completely rewritten. This technique is called Responsive Web Design, which can be translated as responsive web design.