Design of quantum-dot color conversion film for mini-LED backlights

Mini-LED backlight and quantum-dot color conversion (QDCC) technology are the research hotspots of emerging display technology. When they are combined together, the luminance uniformity issue may occur because of traditional QDCC film (QDCCF) with uniform thickness. This paper designs and optimizes QDCCFs with non-uniform thickness of cone and circular truncated cone, respectively. The illuminance uniformity is analyzed by simulation. Results show that the illuminance uniformity of the optimized cone and circular truncated cone with a single structure can reach 73.97% and 74.72%, respectively. The single structure with uniform thickness is only 35.84%. After that, the single structure with non-uniform thickness is arrayed with a basic substrate added at the bottom, which is matched with the mini-LED backlight. By optimizing the array configuration and the basic substrate, the illuminance uniformity of the backlight reaches 73.55% and 79.25%, respectively. This QDCCF with non-uniform thickness distribution can effectively improve the illuminance uniformity when mini-LED is combined with QDCCF. This work proposes a new strategy for uniform color conversion of mini-LED display backlights.