While many brands have released smartphone models using full-HD LCD displays, the S4 represents the first with an AMOLED display at this resolution," Vinita Jakhanwal, director for small and medium displays at IHS, said in a statement. "Reaching a true pixel density greater than 300 ppi has been a challenge for AMOLED display makers. However, Samsung was able to enhance AMOLED display performance by implementing new technologies that also drove up the cost of the display."eaper, at $241.