Apple Inc suppliers will begin mass producing displays as early as May for the next iPhone, expected to be launched this autumn, with a 4.7-inch screen likely to be produced first while a 5.5-inch version could be delayed, supply chain sources said. Japan Display Inc, Sharp Corp and South Korea's LG Display Co Ltd have all been tapped to make the screens, said the sources, who asked not to be identified. Representatives for the three suppliers and for Apple declined to comment. Both iPhone 6 screens will be larger than the 4.0-inch panels on Apple's existing iPhone 5S and 5C models. Larger iPhones, the subject of months of speculation, would mark yet another incremental tweak to the popular smartphone line and an attempt to catch up to rivals like Samsung Electronics Co Ltd.