3400 PPI Active-Matrix Monolithic Blue and Green Micro-LED Display

With rapid developments in display technology and high-speed communication, augmented reality (AR) and virtual reality (VR) are emerging as next-generation display platforms for human–machine interactions. Recently, many significant strides have been made for the micro-light-emitting diodes (Micro-LEDs) display. However, to satisfy the requirements of AR/VR application, the size and resolution density of display have become extremely important. In this article, a 0.39-in $1024\times768$ blue and green active-matrix Micro-LED display with 3400 PPI featuring a pixel size of $5.5~\mu \text{m}$ and a pixel pitch of $7.5~\mu \text{m}$ was designed and fabricated. The blue and green Micro-LED displays exhibit excellent electrical and optical characteristics, including the low forward voltage of 3.3 and 3.2 V, and the brightness reach $7.2\times105$ and $1.7\times106$ cd/m2 (nits) at 1 mA, respectively. These microdisplays demonstrated 8-bit grayscale images and videos vividly through the control of PWM frame generated by the FPGA board. We expect that the presented method could pave the way toward high-performance Micro-LED displays for AR and smart glasses.