sentence: smartphones smartphone use small displays , but today , smartphone displays have a larger ppi rating , such as the fujitsu f-02g with a quad hd display at 564 ppi , the lg g3 with quad hd display at 534 ppi or iphone which is branded by apple as a retina display with maximum 401 ppi - xhdpi or oppo find 7 with 534ppi on 5.5 '' display - xxhdpi ( see section below ) .