Sullivan & Cromwell and Mori Hamada & Matsumoto are advising smartphone and tablet screen maker Japan Display Inc. on an upcoming $3.8 billion initial public offering on the Tokyo Stock Exchange.

The company, which counts Apple Inc. among its customers, was created when the display divisions of Sony Corp., Toshiba Corp. and Hitachi Ltd. merged in 2011. State-backed Innovation Network Corp. of Japan, which was launched five years ago to support Japanese technology companies, invested $2 billion in Japan Display and currently holds an 87 percent share in the venture.