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 nonuniform 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.
Micro-LED will probably become the next epochal display technology, which has combined the advantages of liquid crystal display (LCD) and organic light-emitting diode (OLED). Its self-luminous characteristic will greatly compress the volume of the projection optical engine into truly pico-projection level. However, the relevant design and research are still insufficient. In this paper, we design a four-piece sphere lens group with a 5 mm focal length for micro-LED pico-projection, and then a simulation model of self-luminous projection optical engine is built for demonstration. The total length of the projection lens group is only 8.2mm, the modulation transfer function (MTF) is higher than 0.5@66lp/mm, and the distortion is below 1%. The irradiance distribution shows that the light efficiency is 44.9 % and the uniformity reaches 81.3% when the light divergence angle of micro-LEDs is set to 30°. Then, we explore the influence on light efficiency with different light source divergence angles and determine the optimal range of divergence angles. Finally, a R/G/B integrated micro-LED source with blue light and the above red/green quantum-dot color conversion (QDCC) layer is built, proving the feasibility of a full-color pico-projection optical engine with a single-integrated micro-LED chip.
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