Sources inform that TDG Holding of Haining ,China,has intended to inject 360 million yuan to upgrade a facility that produces four-inch LED sapphire substrate, with annual capacity of 600,000 pieces.   It expects the upgrade to contribute 298.8 million yuan of revenue and yield net profit of 77.323 million yuan annually, for a yield rate of 21.31 percent and an investment return period of 5.94 years. Founded in 1999, TDG Holding started the LED sapphire substrate industry last year.The company also reported yesterday that it plans to spend 19.15 million yuan to ...