Challenges for Micro LED Displays Include Particles in Phosphors and Low Lifetimes

July 10, 2017
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As we have reported, many enterprises and research organizations have been developing Micro LED technology, and feasibility of using red (R), green (G) and blue (B) Micro LED chips simultaneously for full-color display, which is key to commercialization of the technology. Apple has been developing RGB Micro LED technology for full-color display, but has not yet made noticeable progress, although Apple is notoriously quiet about technology advances. Nonetheless, there may be significant difficulties in simultaneously arraying red, green, blue Micro LED chips and transferring them onto substrates, the sources noted. An alternative to RGB Micro LED technology is using blue-light Micro LED chips matched with quantum dot materials or special fluorescent powders to reach full-color display. The method, however, faces bottlenecks caused by particles of special fluorescent powders that are too large to match the sizes of blue-light Micro LED chips and by quantum dot materials with short lifetimes, perhaps only hundreds of hours, due to quick degradation in function and low resistance to heat. In addition to technology, production cost is a challenge to Micro LED development, especially in competition with OLEDs, which are reaching a level of maturity and yields >85%

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