Although Youda Optoelectronics has the ability to produce small OLED display panels, due to process problems, the current yield rate can only reach 30% to 40%, so large-scale mass production is still difficult. In addition, Youda Optoelectronics is still in the research and development stage of small size 371ppi OLED panel. According to all reports, the HTC M7 will use the lower Sharp 468ppi full HD panel.

In addition, it is reported that Samsung is developing OLED panels of more than 440ppi and may use them in Samsung's Galaxy S 4. However, according to another previous news, it is also difficult to make OLED panels better than 440ppi due to OLED technology problems, so Samsung will not use OLED displays in the upcoming Galaxy S 4.