UPDATE 1-Chi Mei executive headed to jail for price-fixing

* 18 executives charged in long-running probe

* Chi Mei ex-executive to serve nine months in prison

WASHINGTON, July 28 (Reuters) - A former sales director for Chi Mei Optoelectronics Corp 3009.TW will serve nine months in prison for trying to fix the prices of computer, television and mobile telephone screens, the Justice Department said on Wednesday.

Wen-Hung Huang, a Taiwan resident, has agreed to serve nine months in jail and pay a $25,000 fine. He has agreed to plead guilty to participating in a price-fixing conspiracy between September 2001 to about December 2006, the department said.

Huang agreed to plead guilty to a single felony charge, which was filed in the U.S. District Court for the Northern District of California.

Chi Mei Optoelectronics is one of several companies ensnared in the conspiracy.

Others are AU Optronics Corp (2409.TW), whose CEO was charged; Chunghwa Picture Tubes Ltd (2475.TW); South Korea's LG Display Co Ltd (034220.KS); Japan's Sharp Corp (6753.T); Epson Imaging Devices Corp, a unit of Seiko Epson Corp (6724.T); Hitachi Displays and HannStar Display Corp (6116.TW).

Thin-film liquid crystal displays are used in computer screens, TVs and mobile phones, among other devices. Major makers in Asia have reported brisk demand as economies recover.

Eighteen executives have been charged in the long-running investigation. (Reporting by Diane Bartz, editing by Maureen Bavdek)