High density displays aren’t anything new to the world of mobile and computing. However, 4k displays represent the last leg in resolution independence. High Density Displays (Retina) started in the mobile sector in 2010 when the iPhone 4 was introduced. The iPhone 4 featured a mind-blowing 326 Pixels Per Inch (PPI) display. Less than two years later, Apple followed the iPhone with the introduction of the Retina MacBook Pros and Retina iPads in 2012. Since then, nearly every smartphone on the market has a high density display as well as the majority of mid-range tablets.