To achieve user immersion experience and wearing comfort, AR/VR glass designer targeting general consumer market strives hard for larger FOV and smaller form factor. These ultimate goals cause challenges for mass production metrology due to geometrical conflicts and test cost inefficiency. Two imaging system designs are reviewed in this paper. Both resolve above practical issues of AR/VR glass optical resolution test by shifting the complexity of the lens design to a novel optical coupler. This coupler smartly remaps discrete angular field points onto a detector with minimum spatial gap. Proposed methodologies significantly decrease the metrology equipment cost for mass production.

The realization of solution-processable laser diodes will open new opportunities in a range of photonic and optoelectronic applications. Colloidal quantum dots (QDs) have gained considerable attention for attaining this goal because of excellent optical properties such as readily tunable emission wavelengths and a near-unity photoluminescence quantum yield. However, demonstration of electrically pumped lasers using colloidal QDs has not been achieved mainly due to their fast nonradiative Auger recombination that plagues generation of optical gain. Important milestones toward QD laser diodes have been achieved as a result of great progress in suppressing Auger recombination; achievement of low lasing threshold under optical excitation and population inversion and optical gain with electrical injection. These achievements guide us to the next step, which is the incorporation of an optical cavity into the LED structure. Here, we demonstrate a dual functional QD-LED with an integrated optical cavity as a promising device platform for realizing solution-processable laser diodes. These devices work well as both LEDs and optically pumped lasers as a result of careful optimization of refractive-index profile across the device. The remaining challenges to realize QD laser diodes will be also discussed.

MicroLEDs have a tremendous potential for future displays. However, there are several technical challenges to overcome prior to widespread deployment of MicroLEDs. One key hurdle is developing a process to release the dies from the sapphire growth wafer. Another is a process to transfer these to the display substrate with micron level precision and reliability. Laser processing offers several opportunities for MicroLED display production, such as Laser Lift-Off (LLO) to separate the finished MicroLEDs from the sapphire growth wafer and Laser Induced Forward Transfer (LIFT) to move the devices from a donor to the substrate. In this presentation, laser-based system solutions for the different manufacturing steps for MicroLEDs, will be presented. Integrated process control and monitoring is used to assure stable and reliable operation to ensure high throughput and low yield losses.

This talk covers thin-film devices based on amorphous oxide semiconductors (AOS) while discussing related physical mechanisms and potential applications, such as neuromorphic systems. Intentionally using a light-induced metastability mechanism of oxygen defects in AOSs, it is allowed to detect even visible lights, eluding to a persistent photoconductivity (PPC) as an optical memory action. So, this PPC phenomenon is naturally useful for AOS-based optical memory applications, e.g. optical synaptic transistors along with an electrical controllability of a recovery speed with gate pulse or bias. In this respect, AOSs can be promising materials for a low-cost transparent neuromorphic application.

Given with the success of OLEDs in many consumer electronics, the search for scalable, additive patterning technique for organic thin films is still continued because the established fabrication method for OLEDs relies on thermal evaporation assisted with fine-metal mask technique, with a low material utilization efficiency and a limited scalability for sequential patterning of RGB subpixels. This talk will introduce recent efforts made for organic vapor-printing (OVJP combining the additive, scalable nature of inkjet printing and the solvent-free advantages of thermal evaporation, to work better with flexible electronics and to allow for batch definition of multiple pixels for display applications.

We introduce our recent works to remove the discrepancy between the perceived distance and optical distance of the images in optical-see-through (OST) augmented-reality (AR) near-to-eye displays (NEDs). The first one is a thin Maxwellian display which is implemented using a waveguide and a pin-mirror array holographic optical element (HOE) coupler. A dual-image-layer AR NED implemented using a polarization grating and a single physical waveguide is also introduced in the presentation. Our recent implementations of light field AR NED which uses a micro lens array to present 3D images, and holographic 3D AR NED are also introduced with experimental results.