There\'s an ongoing trend to bigger screen sizes on desktop monitors, televisions, smartphones, GPS devices and even portable media players, U.S. research says. A study by NPD DisplaySearch shows the diagonal measurement of displays on almost all electronic devices is increasing, with the exception of \"mobile PCs,\" a category including laptops, netbooks, Ultrabooks, and tablets, Slash Gear reported Tuesday. The increase is especially prevalent in smartphones, which will see a whopping 38 percent increase in screen size by 2013 as compared to 2010, NPD DisplaySearch said. Much of that is represented by so-called phablets, smartphones with 5-inch screens almost approaching tablet computer in display real estate. Flat-screen television will also see an ongoing increase in screen size as price reductions make larger units more affordable, the study found. Smaller form-factor laptops and Ultrabooks generally top out at 15 inches, a figure unlikely to change for some time, while tablets with screens larger than 10 inches are often seen as too large or bulky.