Message from the Representative Director


The history of Semiconductor Energy Laboratory Co., Ltd. begins in 1980 with the R&D of solar batteries. With a desire to conserve the earth’s limited resources, we pioneered "energy creation" and established a thin-film technology of silicon semiconductors. Then, we have expanded our R&D fields to displays and integrated circuits. In 2008, we dove into the field of ceramic semiconductor materials, that is oxide semiconductors, where we discovered unique semiconductor crystal states belonging to the realm of "crystalline oxide semiconductors," and this pioneering a new field of research.

Believing that the most important task that we have to accomplish is to create "energy-saving" technologies, we are currently focusing on the development of OSLSI®, which realizes large-scale integrated circuits (LSI) using crystalline oxide semiconductors, and safe and high-energy-density rechargeable battery technology. Our presence as a company specializing in R&D has been established by sending our technologies, which are the results of our developments, out to the world in the form of patents and making them widely available to the public. By acquiring patents and enforcing them, we are able to protect the sophisticated technology of Japan.

Ever since our founding, to carry on the teachings of my mentor, Dr. Yogoro Kato, we have strongly held to the following philosophies, continually asking the "why" to investigate essential principles and causes, and achieving the level of technology that satisfies our customers. Above all, in R&D, we must face challenges with a pure heart and a clear conscience, without losing our sense of gratitude. If we do not have a pure heart, we cannot create inventions that have a good impact on society.

In this country of Japan with very little natural resources, we are determined to live on by inventing new technology. We will continue to improve ourselves day by day with the goal of being part of Japan's further development in mind, while getting our technologies out to the world. I am very confident that the technologies we invent are going to have a great impact on the improvement of technology in Japan and the world.


Representative Director
Shunpei Yamazaki




Representative Director and Chairman (Right)
Shunpei Yamazaki

Shunpei Yamazaki completed the Master's Degree Program at Doshisha University Graduate School of Engineering in 1967. While being in a graduate school, he met and studied under his mentor, Dr. Yogoro Kato. In 1970, while being a Ph.D. student at Doshisha University, he invented a basic device of a non-volatile memory known as "flash memory". Since then, he has devoted himself to R&D of silicon-related technology. In 1971, he received his Ph.D. in Engineering and joined TDK Corporation (formerly known as Tokyo Denki Kagaku Kogyo K.K). In 1980, he founded Semiconductor Energy Laboratory Co., Ltd. (SEL) and assumed the position of Representative Director.

In 1997, he was awarded the Medal with Purple Ribbon from the Cabinet Office of the Japanese Government for the innovation of MOS LSI element technology. In September 2016, he renewed his own Guinness World Record, recognized in 2004 and 2011, for the most patents credited as inventor (11,353 patents). In October 2018, he received W. David Kingery Award by The American Ceramic Society. He is a Life Fellow of Institute of Electrical and Electronics Engineers (IEEE), a foreign member of the Royal Swedish Academy of Engineering Sciences (IVA), a WAC (World Academy of Ceramics) academician, and an ECS (Electrochemical Society) fellow. He received an Honorary Doctor Degree of Culture from Doshisha University. He is also a member of Doshisha Shayu, a title given to the distinguished contributors to the Doshisha.


*The Medal with Purple Ribbon is awarded to individuals who have contributed to academic and artistic developments, improvements and accomplishments.

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Representative Director and President (Left)
Satoshi Seo

Satoshi Seo completed the Master's Program of Applied Chemistry at Graduate School of Engineering of The University of Tokyo in 2000. In April of the same year, he joined Semiconductor Energy Laboratory Co., Ltd., and has been involved in R&D of OLED for more than 20 years. He served as General Manager of OEL division, General Manager of Intellectual Property Division, Director and Corporate Officer, and then assumed the position of Representative Director and President in August 2023.

In March 2015, he was awarded Chemical Society of Japan Award for Young Chemists in Technical Development for 2014 from the Chemical Society of Japan for highly-efficient long-lived organic light-emitting diode (ExTET) utilizing exciplex-triplet energy transfer and its application to white lighting panel. In June 2018, he received National Commendation for Invention (Invention Prize) from Japan Institute of Invention and Innovation for Invention of a method for a highly efficient long-lived organic light emitting diode.

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