Location History:
- Kawasaki, JP (1994 - 2002)
- Sagamihara, JP (2006 - 2008)
Company Filing History:
7 out of 39,238 
1 out of 103 
1 out of 25,550 
Years Active: 1994-2008
Title: The Innovations of Koji Ohgata
Introduction
Koji Ohgata is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of thin film transistor technology, holding a total of 9 patents. His work has been instrumental in advancing the capabilities of liquid crystal display apparatuses.
Latest Patents
One of his latest patents is a method of manufacturing a thin film transistor device. This method includes forming and patterning a semiconductor film to create first and second semiconductor films for low-voltage and high-voltage driven thin film transistor formation regions. The process also involves forming a first insulating film on these semiconductor films and creating a first gate electrode in the low-voltage region. Additionally, a second insulating film is formed on the entire surface above the substrate, with a second gate electrode in the high-voltage region. The method further includes etching the insulating films to form gate insulating films beneath the gate electrodes, ensuring that the second gate insulating film is wider than the second gate electrode.
Another notable patent involves a thin film transistor device and its manufacturing method, specifically for liquid crystal display apparatuses. In this case, the gate insulating film of a low-voltage driven TFT is constituted by a single insulating film with a thickness of approximately 30 nm. This TFT does not include LDD regions. Conversely, a high-voltage driven TFT features a gate insulating film made of two insulating films totaling around 130 nm in thickness. This design includes low concentration impurity regions on the drain side of an n-type TFT and a structure without LDD regions for a p-type TFT.
Career Highlights
Koji Ohgata has worked with notable companies such as Fujitsu Corporation and Fujitsu Display Technologies Corporation. His experience in these organizations has allowed him to refine his expertise in thin film technology and contribute to various innovative projects.
Collaborations
Throughout his career, Ohgata has collaborated with esteemed colleagues, including Ken-ichi Yanai and Tsutomu Tanaka. These partnerships have fostered a creative environment that has led to significant advancements in their field.
Conclusion
Koji Ohgata's contributions to thin film transistor technology have made a lasting impact on the industry. His innovative methods and collaborative efforts continue to influence the development of advanced display technologies.