Abstract MicroLED has a sudden emergence and has great application potential. MicroLED is a new generation of display technology, that is, miniaturized LED arrays, thinning, miniaturizing, and arraying LED structure design, making it about 1% of the size of common LEDs...
Micro LEDs have sprung up and have great potential for application. Micro LED is a new generation of display technology, that is, miniaturized LED array, thinning, miniaturizing and arraying LED structure design, making it about 1% of the size of common LED, each pixel is customized, separate Driving the light, the distance of the pixel points is reduced from the original millimeter level to the micrometer level. The Micro LED fabrication process combines MOEMS technology and LED fabrication process with excellent repeatability and consistency, enabling ultra-high resolution (above 1500 ppi), long luminescence lifetime, and good material stability to avoid OLED devices. The phenomenon of afterimages has great commercial potential in the future. With higher efficiency and lower power consumption, Micro LED is expected to significantly extend battery life. In recent years, the efficiency of luminescent materials has been continuously improved in the field of OLEDs. However, LED luminous efficiency is still the highest, about twice that of OLEDs, and the luminous efficiency of Micro-LEDs is about 4 times that of LEDs. . Micro LEDs consume only 10%-20% of the energy of LCDs and OLEDs. Usually, the screen consumes 50%-60% of the total energy consumption of smartphones. Micro LEDs are expected to significantly reduce the energy consumption of mobile phones and provide longer battery life.
The giant giants are actively deploying, and the commercialization of Micro LED is now available. According to reports, Apple will test the equipment equipped with Micro LED in Taiwan this year, and is the first to launch a batch of AppleWatch using this technology. It is not ruled out that the Micro LED display will be applied to the Apple mobile phone. Apple acquired LuxVue, a company that developed Micro-LEDs, in 2014. Over the years, its technology reserves have increased and its patent reserves are abundant. In addition, Hon Hai recently announced that in order to lay out the most promising new generation display technology Micro LED after OLED, the company invested about 10 million US dollars through the subsidiary CyberNet to acquire part of eLux, and elux in Micro LED transfer technology. There is a patent layout.
At the same time, unlike Apple and other big companies who are interested in using Micro LEDs for wearable devices or mobile phones, Sony is the first to showcase the 110-inch indoor large-scale display CLEDIS (Crystal LED Integrated Structure) produced by Micro LED technology. Stunning. In addition, foreign research teams include Texas Tech University, University of Illinois, University of Strathcly, and so on. According to LEDinside, if the size of the components of the existing LCD monitors is completely replaced, including backlight modules, liquid crystals, polarizers, etc., the potential market size of Micro LEDs in the future will reach approximately US$30-40 billion.
Technology and cost are the main bottlenecks, and large-scale applications will take time. The main technical challenge facing Micro LEDs today is Mass Transfer. Similar to the preparation method of LED, Micro LED can be fabricated by etching on sapphire substrate, but the difficulty lies in the fact that the preparation of Micro LED needs to be arrayed and miniaturized, and the address is transferred to the circuit substrate to form ultra-small pitch LED. To achieve ultra-high pixel, ultra-high resolution. The whole process requires extremely high transfer process, the yield needs to reach 99.9999%, and the precision needs to be controlled within plus or minus 0.5μm, which is extremely difficult.
At present, the transfer related technologies include Van der Waals force, electrostatic adsorption, phase change transfer, and laser ablation, but the related processes are still immature. In addition, according to estimates, the current manufacturing cost of Micro LED display technology is still 3-4 times higher than that of existing display products, so manufacturers are actively increasing the added value of products and improving the chip and transferring technology yield to achieve cost. With the goal of falling, it is estimated that it will take 3 to 5 years to replace the existing LCD products.
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