HTC has already revealed the J Butterfly, which boasts a 1080p display at 440 ppi.
A Korean publication has suggested both Samsung and LG are planning to release smartphones featuring a higher pixel density than the iPhone 5's Retina Display. The two Korean conglomerates are apparently planning to implement full 1080p resolution to its smartphones screen sometime during the first half of 2013.
Both Samsung and LG are said to be integrating more than 400 pixels per inch for future smartphone displays. This is compared to the 326 pixels per inch found in the iPhone 5's Retina Display.
The report also said that LG has previously showed off a 5-inch display with 440 ppi, while Samsung is said to be ordering 1080p resolution screens from the company's own display business. The highest resolution display found in Samsung smartphones is in the Galaxy Nexus, which clocks in at 316 ppi.
HTC had recently unveiled the J Butterfly, a smartphone that boasts a full 1080p display at 440 ppi.