02MICRO REPORTS ON RESULTS OF INVESTIGATION BY THE ALJ

Date20-Apr-2010

GEORGE TOWN, Grand Cayman, April 19, 2010 (GLOBE NEWSWIRE) -- O2Micro(R) International Limited (Nasdaq:OIIM - News) today announced that the Administrative Law Judge (ALJ) for the U.S. International Trade Commission (ITC) issued an Initial Determination regarding respondents Monolithic Power Systems, Microsemi, and ASUSTek (Respondents).

The ALJ determined that none of the Respondents in the investigation violated Section 337 (19 U.S.C. # 1337). See In the Matter of Certain Cold Cathode Fluorescent Lamp Inverter Circuits And Products Containing Same, Investigation No. 337-TA-666. The ALJ's ruling is merely an Initial Determination on the Respondents' activities as they relate to a single O2Micro patent. If the Commission grants a petition for review, it may affirm, modify, reverse, set aside, or remand all or part of the ALJ's decision in developing the full final determination. The Initial Determination also is not determinative of any of O2Micro's other outstanding patent litigation efforts, and does not apply to the hundreds of other patents in O2Micro's patent portfolio, including the emergent market of LED applications.

History of the case

On December 15, 2008, O2Micro filed a complaint with the ITC requesting an investigation pertaining to certain products by Monolithic Power Systems, Microsemi and ASUSTek, whose products incorporate technology that may infringe on O2Micro's patents and are imported into the United States. The complaint sought an exclusion order barring the importation, sale for importation, or sale after importation of products that infringe on O2Micro's patents relating to certain CCFL inverter circuits, inverter controllers and other technology covered by O2Micro's patents. An evidentiary hearing on the remaining patent was held before the ALJ in October 2009.

About O2Micro

Founded in April 1995, O2Micro develops and markets innovative power management and security components for the Computer, Consumer, Industrial, and Communications markets. Products include Intelligent Lighting, Battery Management, Power Management, and SmartCardBus(R) products.

O2Micro International maintains an extensive portfolio of intellectual property with 13,404 patent claims granted, and over 15,000 more pending. The company maintains offices worldwide. Additional company and product information can be found on the company website at http://www.o2micro.com/.

The O2Micro International Limited logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=6567

O2Micro, the O2Micro logo, SmartCardBus, and combinations thereof are registered trademarks of O2Micro. All other trademarks are the property of their respective owners.

Statements made in this release that are not historical, including statements regarding O2Micro's or management's intentions, hopes, beliefs, expectations, representations, projections, plans or predictions of the future, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve risks and uncertainties that may cause actual results to differ materially from those set forth in these statements. Factors that could cause actual results to differ materially include risks and uncertainties such as reduced demand for products of electronic equipment manufacturers which include O2Micro's products due to adverse economic conditions in general or specifically affecting O2Micro's markets, technical difficulties and delays in the developments process, and errors in the products. You are also referred to the Form F-1 in connection with the company's initial public offering in August 2000, Form F-3 in connection with the company's public offering in November 2001, and the annual reports on Form 20-F, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. The company assumes no obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise.

Contact:

O2Micro International Limited
Gary E. Abbott, Director of Investor Relations
408.987.5920, x8888
gary.abbott@o2micro.com