Byeongjin made an oral presentation entitled, “Comfortable Brightness for Watching Television in the Dark” on AIC 2021. In his study, he investigated the appropriate brightness of the display when users watching them in the dark. For this study, he conducted the experiment for the cognitive evaluation using six video stimuli with different levels of brightness and dynamics. His study provided empirical evidence that display manufacturers can apply to offer users a more comfortable viewing.

Abstract
This study investigated the visually comfortable brightness range of viewing television content in a dark environment. We prepared 8-second-long six types of videos for the experiment, and their luminance level was adjusted along with the 15 luminance levels, ranging from 20 nit to 500 nit. Thirty-one participants joined the experiment, and each watched the videos in a dark room. Then, the participants made subjective judgments of the visual comforts of the displayed videos using 5-point Likert scales ranging between -2 (too dark) and +2 (too bright). The television luminance around 129.82 nit was found to be acceptable in a dark environment. In particular, the participants preferred higher luminance when viewing the dark videos, and lower luminance videos when viewing dynamic videos. The results provide empirical evidence that display manufacturers may offer users a more comfortable television viewing experience in a dark environment.