Display size is an ever growingly important feature in modern smartphone. Trend of having as big display as possible begun from Asia but has spread throughout all regions. New trend of bigger aspect ratios are enabling bigger displays to be fitted fueling also development of other display technologies. This report forecasts the display size by different region and It can be used by component manufacturers, handset vendors, operators, vehicle makers and developers to identify or prioritize the most popular display sizes penetrating billions of mobile devices worldwide.