Takanobu Nakagawa

Title: Takanobu Nakagawa: Innovator in Thin-Film Transistor Technology

Introduction

Takanobu Nakagawa is a notable inventor based in Kobe, Japan. He has made significant contributions to the field of thin-film transistors, holding a total of 3 patents. His innovative work has advanced the technology used in liquid crystal displays and semiconductor devices.

Latest Patents

One of Nakagawa's latest patents is for a top gate thin-film transistor. This invention involves forming a transparent insulation film on a glass substrate, with source and drain electrodes positioned in a spaced and opposing manner. The substrate undergoes treatment with PH.sub.3 plasma to diffuse phosphorus atoms, creating a doped surface layer. An amorphous silicon semiconductor layer is then formed to bridge the space between the source and drain electrodes. A gate insulation film is applied over the semiconductor layer, followed by a metal gate electrode. The process includes using an excimer laser beam to define the source and drain regions of n.sup.+ poly-Si.

Another significant patent is for a gray scale multi-domain liquid crystal display panel. In this design, liquid crystal is encapsulated between two transparent substrates. Pixel electrodes are arranged in a matrix format on one substrate, while a common electrode is placed on the other. Each pixel electrode is divided into subpixel electrodes, which are connected to a thin-film transistor to apply driving voltage. The design incorporates alignment layers that create a pretilt angle for the liquid crystal, enhancing display performance.

Career Highlights

Throughout his career, Takanobu Nakagawa has worked with prominent companies such as Hosiden Corporation and Nippon Telegraph and Telephone Corporation. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking technologies in the electronics sector.

Collaborations

Nakagawa has collaborated with notable coworkers, including Yasuhiro Ukai and Tomihisa Sunata. Their combined expertise has fostered innovation and development in their respective fields.

Conclusion

Takanobu Nakagawa's contributions to thin-film transistor technology and liquid crystal displays have made a lasting impact on the industry. His inventive spirit and collaborative efforts continue to inspire advancements in electronics.