Patents by Inventor Chung-Tsung Chen

Chung-Tsung Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Led driving topology, light source moudle based thereon, and digital camera having the same
    Publication number: 20090195187
    Abstract: A LED driving topology includes a LED array and a current source connected in series between two power inputs receiving a positive voltage and a negative voltage respectively. This topology increases the voltage difference across the LED array and hence has the capability of lighting up more serially connected LEDs, without requiring an additional boost circuit or a high voltage. In addition, the circuit of the current source can be made by a low-voltage manufacturing process.
    Type: Application
    Filed: March 5, 2009
    Publication date: August 6, 2009
    Inventors: Chung-Tsung Chen, Chung-Hsiung Chang, Tsan-Huei Wu, Shih-Hui Chen