what is difference between hd and full hd

For comparison, the pixel density of a 5.5-inch Full-HD display is 400 dpi.ĭefinitions are also often referenced by the smallest number of pixels in the measurement - HD will sometimes be called 720p, Full HD is called 1080p and so on. A 5.5-inch QHD display has a pixel density of 538 dpi. The pixel measurement for QHD is 2560 x 1440 pixels. This means that you can insert the same number of pixels as four HD displays into a QHD display of the same size. QHD stands for Quad HD, four times the standard HD definition. With 5-inch smartphones, the pixel density is around 440 dpi, while on a 5.5-inch screen, this number drops to 400 dpi. Again, the pixel density will depend on the overall size of the screen. According to Apple, 300 dpi is the weak point, because it is about the point at which the human eye stops being able to discern individual pixels at a certain viewing distance (and on a screen of a certain size).įull-HD is the next step and is currently the standard for screen definition for smartphones, although 2K (QHD) has gained ground over high-end devices.įull-HD resolution measures 1920 x 1080 pixels. On a 4.7-inch screen, the pixel density drops to 312 dpi, but both are still HD screens. Simply having an HD screen does not mean much, as it will produce a very different image on a 5-inch screen than on a 10-inch screen (note: the screen size is measured diagonally to take into account slightly different aspect ratios).Ī 4.3-inch screen, for example, has a pixel density of 342 dpi. Whatever the size of the screen, as long as the pixel measurement remains at this measurement, it is an HD screen.Īs you can probably see, the smaller the HD screen, the higher the pixel density and, in theory, the better the image. HD simply means a pixel measurement of 1280 x 720 pixels. You may also want to pay attention to the 'nits' indicated, which are an assessment of the brightness for the screens. We have the main basics covered below, but we will start with an HD definition or higher, as this is what most smartphones currently offer. You can easily calculate the dpi of your phone using a pixel density calculator. If you know the size of the screen, you can calculate the number of pixels compressed in a square inch: this is the number of pixels per inch (dpi), called pixel density. The size of the screen (in inches), the number of pixels (the amount of information it can display) and the density of these pixels are grouped into this 'definition' category (pixel per inch). As an indication, the larger the numbers, the better the result. Screen definition is an important factor to consider when talking about smartphone screens.

What is difference between hd and full hd