Polar Light Technologies AB - Pyramidal microLEDs in the same material system paving the way for RGB emission in micro displays

Polar Light Technologies (PLT) has developed a novel microLED solution to generate RGB emission within a single material system. This is achieved by direct growth of hexagonal GaN pyramids with InGaN quantum wells (QWs) as the emitters on substrates with predefined patterns. MicroLEDs with dominant emissions at 470 nm, 520 nm and 625 nm from these QWs are demonstrated without the need for separate phosphor or color conversion via quantum dots. This microLED concept enables extremely high-resolution, ultra-compact displays - a critical requirement for AR smart glasses, wearables, HUDs and HMDs. PLTs pyramidal structures focus the emission into a narrow sub-Lambertian light lobe, resulting in more than doubling the usable light directed toward the viewer. PLT has also successfully demonstrated a display via a special flip-chip bonding process to integrate the pyramidal LED frontplanes with the CMOS backplanes. PLTs approach paves the way for high light output and energy efficiency, enabling lower power consumption and longer battery life in portable devices.