The phrase "display surface" refers to the area on which images or information are shown or displayed, such as a television screen, computer monitor, or smartphone screen. Full definition
3 Make vintage mirrors do double duty as display surfaces for jewellery and toiletries. (styleathome.com)
Potential applications for flexible electronic technology include phones that have curved display surfaces or clothing with electronics printed on them to monitor the vital signs of athletes or members of the military. (entrepreneur.com)
As a result this is a smartphone that offers more display surface area within a body that is more typically associated with smaller display - touting smartphones. (androidheadlines.com)