OMU News

Jun 16, 2022

Professor Naito Receives 2022 Slottow-Owaki Prize from Society for Information Display!

Specially Appointed Professor Hiroyoshi Naito, School of Engineering (Professor Emeritus, Osaka Prefecture University), received the Slottow-Owaki Prize from the Society for Information Display (SID).

The Slottow-Owaki Prize is awarded to individuals who have made outstanding contributions to education and training in the information display field.


Professor Naito, about the award-winning research: 

In the information display field, we have studied the basic properties of nematic liquid crystal (LC) TVs and organic light emitting diode (OLED) TVs. We have developed measurement methods for the behavior of impurity ions in the nematic LC used in TVs (formation, conduction, and adsorption/desorption processes on alignment layers), and for the rotational viscosity of nematic LC from transient current. The transport and the adsorption of impurity ions are processes that degrade the image quality of LC TVs, while the rotational viscosity of nematic LC is a physical quantity that determines the response speed of the image of LC TVs. Especially, we have theoretically and experimentally shown that all Leslie viscosity coefficients can be determined in case of nematic LC with negative dielectric anisotropy, and the measurement system based on the theory was commercially available.  

OLED TVs are generally using an OLED front plane and a thin-film field-effect transistor (FET) backplane architecture. We have developed measurement methods for electronic transport such as bimolecular recombination and localized states in OLEDs by impedance spectroscopy, as well as for the density of interfacial states, dielectric properties of insulators, and contact resistances of organic FETs. The electronic properties obtained from these measurement methods provide useful knowledge for clarifying the degradation factors of OLEDs and organic FETs and for structural design and optimization of OLEDs and organic FETs. 

I briefly described the outline of my achievement. If you are interested in a more detailed summary of my research history, please visit this website (in Japanese):

Award Statement:

The Society for Information Display (SID) was founded in 1962; it is the world's largest society for electronic display devices. It has four top awards for individuals: the Karl Ferdinand Braun Prize, the Jan Rajchman Prize, the Otto Schade Prize, and the Slottow-Owaki Prize. It is a great honor to be recognized for our contributions to education and training through research activities with graduate students and researchers in industries. I would like to express my sincere gratitude to the members of the Japan Chapter of SID for their nomination and to everyone who made this happened. The award is the result of collaborative research with students enrolled in our laboratory and people in display-related industries. I would also like to thank the staff of my laboratory and the people at the Research Institute for Molecular Electronic Devices, for their continued support for my research activities.


I was interested in chemistry in my early elementary school days, and I was introduced to amateur radio in the third grade. After that I made up my mind to go study electronics at university. In retrospect, it was a natural choice to work in newly developed research field combining electronics and chemistry, organic electronics when I was young. I have been involved in different research fields, but fortunately, I have been unintentionally working in display device physics, which led to receiving this award.

Although I retired at the end of March this year, I am continuing my research at Osaka Metropolitan University. We would like to invite students who are willing to collaborate with us to join our research activities. If you are interested, please send an e-mail to the contact information below.

Related Information

SID Slottow-Owaki Prize Winners Article  

Hiroyoshi Naito Laboratory, Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University (previous institution, in Japanese)   

Hiroshi Ikeda Laboratory, Department of Applied Chemistry, Division of Materials Chemistry and Biophysics, Graduate School of Engineering, Osaka Metropolitan University (in Japanese)   

Original Japanese Article 


Graduate School of Engineering, Osaka Metropolitan University
Professor Hiroyoshi NAITO
h.naito[at] (Change [at] to @)


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