During a wearable conference in Tokyo, Japan's ColorLink demonstrated its new VR and AR prototype devices, which both use OLED microdisplays. The company says that using OLED microdisplays it can produce more compact VR devices.

ColorLink OLED microdisplay VR/AR prototypes (wearable Expo Japan 2018)

The ColorLink devices use 0.7" FHD OLED microdisplays, which are probably Sony's ECX335AF displays.