Survey of Luminance of Outdoor Digital Signage at Night

Abstract

High-brightness digital signage have begun to be installed for outdoor advertisements in Japan. The CIE150 standard sets a maximum luminance value of 1000 cd/m², but it is hardly regulated by outdoor advertising in Japan. In this survey, we first investigated the brightness functions of digital signage and found that most did not have a dimming function for adjusting to the brightness of the environment. In addition, we measured the luminance and size of outdoor advertisements and vertical illuminance in the Shibuya, Ginza, and Shinjuku neighborhoods of Tokyo. Many of the signs exceeded 1000 cd/m², so there is an urgent need for regulation. We hope that the results of this research will serve as the starting point for brightness regulation in Japan.