Universal Display Corporation announced its results for the fourth quarter and year ended Dec. 31, 2011. For the fourth quarter of 2011, the company reported operating income of $3.6 million and net income of $5.7 million, or $0.12 per diluted share, on revenues of $18.7 million. This compares to an operating loss of $210,000 and a net loss of $5.3 million, or $0.14 per diluted share, on revenues of $10.8 million for the fourth quarter of 2010. “Strong demand for both our proprietary materia...