In addition, the size of the OLED microdisplay panel must be expanded for a wide field of view (FoV) in AR/VR glasses. To increase the applications and market share of OLED microdisplays, their device architectures, materials, and fabrication processes should be improved. After the company eMagin, which pioneered OLED microdisplays, released its SVGA+ product in the market in 2001, many companies such as MicroOled (France), Sony (Japan), OlighTek (China), Kopin (USA), Seeya (Chian), and LG Display (South Korea) emerged and researched and sold OLED microdisplays. Since the first OLED microdisplays were developed in the late 1990s, OLED microdisplay technology has been rapidly improving. However, even though OLED microdisplays have been released commercially, they need much higher luminance, resolution, and efficiency to improve the device quality. Because OLED microdisplays have superior performance compared with LCoS and DMD microdisplays, many AR/VR devices use OLED microdisplays. OLED microdisplays have been used in various electronic devices such as TVs, mobile phones, tablets, laptops, and automotive displays due to their fast response time, small thickness, light weight, high contrast ratio, rich colors, and small form factor. Advanced technologies are required for high-resolution and low-cost full-color quantum dot-based and microLED-based microdisplays. DMD microdisplays have a complex fabrication process and need additional light sources. LCoS microdisplays have high luminance and simple fabrication processes, but low response time, low contrast ratio, and relatively large volume and weight due to their external lighting sources. LCoS and DMD have already been used in various applications such as projectors, projection TVs, night vision for military use, and AR/VR glasses. There are many types of microdisplays such as liquid crystal display (LCD)-based microdisplays that use high-temperature polysilicon (HTPS) technology, liquid crystal on silicon (LCoS), digital micromirror device (DMD), organic light-emitting diode (OLED)-based microdisplays including OLED on silicon (OLEDoS), quantum dot-based microdisplays, and microLED-based microdisplays.

Microdisplays have received much attention as main display engines of augmented reality/virtual reality (AR/VR) devices due to their small size and high resolution.

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