Contents I. Introduction
The demand of high quality displays has driven the recent advances in various aspects of display technology. From liquid crystal to organic light emitting diodes (OLEDs), many inventions have been demonstrated by labs and companies around the world. One of these technologies is micron-scaled light emitting diodes (or micro LEDs). These down-sized LED chips can provide highly saturated color while maintain the high production yield thanks to semiconductor fabrication. However, as the demand for high resolution micro-display becomes higher, the size of pixel needs to be reduced down to ten micro-meters or even less. In this situation, the traditional micro/mini LEDs, whose sizes are around 100 to , can not fulfill the requirement [1]. Meanwhile, a miniaturized micro-LED chip is very difficult to be physically moved from one substrate to another, not to mention the degradation of the quantum efficiency of the device [2]. To overcome this difficulty, one can resort to novel material and engineering design to facilitate the device scaling. Thus a color conversion layer with monochromatic micro LED array can be considered as a potential solution. The materials of the color conversion layer can be made of nanoparticles (or colloidal quantum dots, CQDs), illuminating polymers, or dyes [3]. In this presentation, we will demonstrate our latest progress on this subject and the results shall be useful for the next generation of high resolution micro-displays.
A roadmap for our CQD integration with micro leds [3]–[7].
Illustrations of potential solutions for CQD patterning: (a) Photo-sensitive resin, (b) direct deposition, and (c) nano-imprint.
Schematic diagrams of the integrated color conversion layer with micro LED arrays.
