(Reuters) – Apple Inc is in talks to buy Japan-based Renesas Electronics Corps stake in a unit that designs liquid crystal display chips for iPhones for about 50 billion yen ($483 million), the Nikkei reported, without identifying a source. Renesas owns 55 percent stake in Renesas SP Drivers, its joint venture with Sharp Corp and Taiwans Powerchip. Apple expects to complete the stake purchase by summer, the business daily reported on Tuesday. Sharp, which owns 25 percent in Renesas SP, is expected to sell its stake to Apple if the U.S. company asks, the newspaper said.