Efficiency, resolution, and gamut tradeoffs of varied microLED architectures

MicroLED display technology is in a period of rapid technological development and different architectures are being evaluated to fit a wide range of market applications from microdisplays to video walls. In particular, color converted architectures using quantum dots have been proposed to enable ease of manufacturing as compared to RGB displays assembled from direct emitting LEDs. InGaN and AlGaInP have been proposed for direct emitting red microLEDs, while quantum dot conversion of red by InP quantum dots has been proposed from both blue and UV InGaN LEDs.

We have modeled the efficiency tradeoffs of these architectures based on a meta-analysis of literature data in combination with experimental results as a function of pixel size. The expected resolution limitations for downconverted and direct architectures are also compared. In addition to efficiency, color gamut and resolution are also critical factors in choosing a microLED architecture. The color gamut of direct and color converted architectures are calculated from our meta-analysis of literature data, and advantages of different architectures are demonstrated.