Design of black matrix in meta-mirror applied micro-OLED cavity using nanoslit of vertical plasmonic resonance

The high-resolution micro-display is essential component of augment reality and virtual reality devices. The mature fabrication and development of organic light emitting diodes (OLEDs) make the high-resolution micro-OLEDs. Metasurfaces are crucial part to realize the high-resolution micro-OLED. Non-color filter design with constant cavity length of each subpixel have been achieved by meta-mirror which consists of nanoscale silver pillars with distinct diameter and period for each subpixel. In this case, the meta-mirror only served to control the reflection phase, but by adding a dielectric layer to the meta-mirror, it can also function as an absorber. Through this idea, we designed a meta surface to function as a black matrix (BM) by implementing an absorber on the bottom mirror of micro-OLED and verified through simulations that it operates as a BM. From simulations, the designed absorber shows over 90% averaged absorption in whole visible range (400–750 nm) and we demonstrated that the proposed absorber can function as a BM in various designs, including the traditional BM design and the pantile diamond pixel design.