Optical Crosstalk Suppression in High-Resolution Quantum Dot Light-Emitting Devices

High-resolution (HR) displays are in much demand as metaverse makes near-eye displays the most important equipment in recent years. Based on wave optics, a microscale optical crosstalk model for HR display devices is proposed. It is indicated that the pixel pattern will be distorted over long-distance transmission in light-emitting devices with inner periodic microstructure, and the optical distortion is related to the size of pixels and the distance from the emitting layer to the outlet. A bottom emissive HR red quantum dot light-emitting diode (QLED) array is introduced to confirm the model and a top emission scheme is provided to effectively reduce the transmission distance and suppress the pixel distortion. Optical-crosstalk-free pixels are finally achieved by adopting the optimized top-emission cathode thickness of 30 nm. This study provides a direction for realizing high-quality and high-resolution micro-displays. The optical distortion is related to the size of pixels and the distance from the emitting layer to the outlet. A top emission scheme is provided to effectively reduce the transmission distance and suppress the pixel distortion. Optical-crosstalk-free pixels are achieved by adopting the optimized top emission cathode thickness of 30 nm. image