Improved Light Extraction from Micro-LEDs

(Summary) Display panels with high-efficiency micro-LED structures for high resolution, high brightness displays. The micro-LED design has a conductive side arm that contacts the bottom layer of the LED stack to improve the p-type ohmic contact and avoid shadowing of emitted light. The LED also has a composite reflective layer under the bottom contact to maximize light extraction. The micro-LED structure includes a bottom conductive layer, a light emitting layer, top contact, a dielectric layer, and the conductive side arm connecting the bottom layer. The composite reflective layer includes insulating and metallic layers.

(Summary) An optical device with improved light extraction efficiency and manufacturing method. The method involves forming spacers on the sidewalls of a sacrificial mesa, depositing a reflective metallic layer on the spacers, removing the mesa to create a pocket between the spacers, and installing a die with vertical sidewalls into the pocket. The spacers and reflective layer help direct and reflect light generated in the die toward the top surface for extraction. This improves extraction compared to conventional LEDs, where light can be trapped and absorbed in the sidewalls. The spacers and reflective layer provide an optical cavity around the die to enhance light's internal reflection and extraction.

(Summary) Micro-LED arrays are formed using vertical sidewall spacers to enhance light extraction. The devices have a light-emitting structure with vertical sidewalls, an optically transparent spacer layer with an internal face facing the sidewalls to enhance light extraction and a reflective conducting mirror layer on the external face of the spacer.

(Summary) Micro-LED display panel with improved efficiency and fabrication method. The micro-LED structure has a unique design to enhance light extraction efficiency. It includes a conductive side arm that connects the bottom layer of the LED to the bottom contact layer. This creates a vertical current path that avoids current crowding and improves uniform current spreading. The LED also has a composite reflective layer underneath the bottom contact to increase reflectivity. This helps trap and redirect oblique angle light for extraction. The micro-LED structure uses a transparent isolation layer to cover the sidewalls and protrude the top of the LED layers, allowing a top contact to be added over the transparent layer.

(Summary) Double color micro LED display panel for increasing light output rate and resolution. The panel has pixels with a first light emitting layer and a second light emitting layer that emit different colored light. Barrier components between pixels block light transmission between pixels. The second light emitting layers are bonded using non-metallic material to prevent electrical shorting.

(Summary) A method to optimize light extraction efficiency of small micro-LEDs and improve their brightness. The method involves forming spacers on the sidewalls of the LED mesa using an insulating material. A transparent conducting oxide layer is then deposited on the top surface of the mesa, followed by a reflective conducting layer. The spacers and transparent oxide layer act as an optical cavity to enhance light extraction. The insulating spacers prevent electrical leakage between the transparent and reflective layers. This prevents damage to the active region while maximizing light extraction.

(Summary) Micro-LED design with high extraction efficiency for displays. The LED has a conductive bottom layer, a light-emitting layer, and a top conductive layer. It includes a protruding section on the bottom layer that extends beyond the other layers. A transparent isolation layer covers this protrusion. A side arm connects the bottom layer to the bottom conductive layer. The bottom conductive layer also has a composite reflective layer underneath.

(Summary) Micro-LED display panels with high-efficiency pixels for high resolution, high brightness displays like AR and VR devices. The micro-LED pixels have a unique structure with improved light extraction efficiency, high reflectivity, and good ohmic contacts. The key features are a conductive side arm that contacts the bottom layer of the LED stack, a composite metal-dielectric reflective layer beneath the LED stack, and a protruding top layer covered by a transparent isolation layer. This design reduces light trapping, improves reflectivity, and allows better electrical contacts.

(Summary) A micro-LED structure for AR/VR displays with improved light patterns uses optical structures like lenses and reflective cups over each micro-LED chip. The micro-LED structure includes multiple micro-LED chips arranged in a line, each with a reflective coating around the sidewalls. Optical structures, such as asymmetric lenses and reflective cups, are placed over each micro-LED chip to shape and direct the light output.

(Summary) An LED assembly to improve micro-LEDs' light efficiency, brightness, and integration. The assembly involves vertically aligning micro-LEDs into the substrate through holes rather than laying flat. This optimized alignment significantly improves light efficiency, brightness, and integration of the micro-LEDs compared to horizontal alignment.