According to Japanese newspaper Nikkan Kogyo Shimbun, Sharp will begin production of screens for the next iPhone in June at its No. 1 plant, Kameyama.
Japan Display and LG Display were also solicited. These two groups have already started to produce displays for the iPhone 5S.
The news confirms a previous report by the Wall Street Journal which stated that Apple will begin production of the handset in the second quarter of 2013.
The announcement of the iPhone 5S will take place simultaneously with the release of the iOS 7.
The device is expected to have the same design as the current iPhone 5 and come with a more powerful processor and an improved camera, as well a fingerprint sensor.
KGI Securities analyst Ming-Chi Kuo expects a fall release date for the iPhone 5S, with a launch between September and November.