In recent years, in an environment where the Internet can be freely used anywhere, the use of small-sized displays is rapidly increasing, and accordingly, the number of display-related patent applications is increasing. We examined the display application technology through patent application analysis. In this study, we investigated the emerging technology as a Fourth Industrial Revolution technology in the display field to predict the direction of the technology development by examining the patent application trends in the core manufacturing technologies that are the recent issues in the display industry. In particular, we selected original technologies that can be applied to OLEDs and micro LEDs, and examined patent application trends and current directions. This paper reports the trends in manufacturing and applications of display technology according to patent applications.