Quantum Dot Film Patterning on a Trenched Glass Substrate for Defining Pixel Arrays of a Full-color Mini/Micro-LED Display

The major hurdle to the implementation of full-color mini/micro-LED display is the mass transfer of red-green-blue (RGB) LED chips, which leads to low yield and high cost of full-color mini/micro-LED display. To overcome this issue, an alternative emitting source of quantum dot (QD) color conversion film with monolithic excitation backlight is a feasible solution. This paper proposes an innovative approach to pattern the red and green QD films on a trenched glass substrate by optimized laser scribing, followed by subsequent trench filling and glasses adhesive bonding to form a full-color QD pixel array for color tuning. Full-color QD pixel array with pixel size 500x500 μm was achieved as passive color conversion layer for prototype demonstration of the full-color mini/micro LED display.