The 441ppi pixel density on the HTC DROID DNA matches the pixel density on Samsung's rumored 5 inch display
According to a report out of Korea, Samsung has been struggling to mass produce these displays because of the evaporation process technology that it uses. Samsung Display is trying to obtain advanced LITI technology from 3M that allows OLED material to be more smoothly printed on glass. Those with knowledge of the situation say that Samsung is still having difficulties with the technology. Blue-colored materials are slowing down Samsung's mass production of the displays.
The source says that due to these problems, Samsung might not be able to release the device using the panel (purportedly the Samsung Galaxy S IV) on time. Speculation is that the next Galaxy S smartphone will be launched sometime in the second quarter of 2013.