PixelEngine All-in-One: A Printable Pixel-Driver MicroIC With Three-Dimensionally Integrated Red, Green, and Blue MicroLEDs

Displays that utilize millions of tiny microLEDs promise a future generation of phones, computers and televisions that are bright enough for sunlit environments yet consume less power. The microLEDs are made using wafer-level semiconductor processes, and key to manufacturing displays is the capability to assemble billions of microLEDs onto panels. Elastomer stamp transfer printing is a mass transfer technology with the yield, accuracy, speed, and scalability required to meet the demands of display manufacturing. The versatility of elastomer stamp transfer leads to further innovations for displays, these include the ability to integrate miniature integrated circuits, called microICs, for advanced backplanes and strategies where microLEDs are combined into PixelEngine packages on intermediate substrates before final assembly to the display panel. This paper reviews how transfer printing has been applied to microLED display development to date and describes a pixel-driver microIC with vertically integrated microLEDs, called PixelEngineAll-in-One, that performs all pixel functions and is designed to enable displays realized through assembly onto passive wiring panels.