That means the iPhone 5S display could reach a total of 1.5 million pixels, according to the Chinese-language Wei Feng Network.
This would be a vast improvement over the 727,040 pixels found in the current iPhone 5 Retina display, which stands at 640 x 1,136 resolution and 326 pixels per inch.
It would also keep Apple from trailing competitors like Samsung, which recently launched its Galaxy S4 smartphone containing a 1920 x 1080 resolution and 441 ppi.
iPad mini-like bezel
The iPhone 5S is also said to be taking some design tips from the iPad mini by adopting a much narrower bezel around the screen like its tablet counterpart.
While the all-important iPhone 5S release date and price haven't been confirmed, previous reports suggest that the Apple's 2013 iPhone will enter mass production in June and launch in September.
The iPhone 5S launch should be accompanied by the company's next mobile operating system, the iOS 7, and what's expected to be a flat, skeuomorphic-free design.
Via Unwired View