2022
04 · 11
Experts say news:
Micro LED Micro latelyto showThere are new frequent trends and new technological breakthroughs are also made in the country and abroad.
? The University of Yonsei develops a color microphone with three high resolution primaries LED displaytechnology
? The University of Kyung Hee is developing tables of optical devices with ultra-elevated density for AR devices
? Enkris publishes color GAN products for micro LED applications
The University of Yonsei is developing a color micro-LED with three high resolution primariesDisplay technology
It is reported that Hwang Bo-Min, Hu Luhing, Hoang Anh-Tuan and Choi Jae-Yong from Professor Jong-Hyun Ahn’s team from the University of Yonsei’s electrical and electronic engineering department use MOS2 semiconductors and micro-Micro-Micro-Affilting points.
Technology is published in Nanotechnology Nature and is the first development technology of development in the world using semiconductors and two-dimensional quantum points, promising to develop the augmented new generation (AR) and virtual reality (VR) monitor。
To make micro-LED screens, you need a complicated transfer process of three colors of micro-LED chips individually to the circuit printed with panels. Although this manufacturing method is suitable for the production of large low -resolution screens, it cannot respond to new generation (AR) and virtual reality (VR) augmented reality screens that require high resolution and high -speed operation.
To overcome The Technical Limits of Developing Micro LED Displays, The Research Team Form A Two-Dimensal Semiconductor Molybdenum Disulfide (Mos2) Directly on the Gallium Nitride (Gan) Wafer for Blue Leds, and then Integrated the Semiconductor Circuit To Create A Semiconductor Circuit, Successfully Achieving the World’s First 500 PPI (Number of Micro Led Light Sources Per Inch) High resolution microphone without transfer process LED display. In addition, the research team has developed a technology that can considerably improve the performance of the display process and reduce production costs by printing quantum points on micro LED Blue Gan. In addition, the technology developed by the research team can not only simplify the complex manufacturing process of micro-LED screens, but also reach high resolution.
The University of Kyung Hee is developing tables of optical devices with ultra-elevated density for AR devices
Recently, a research team led by Professor Lee Seung-Hyun of the electronic engineering department of Kyung Hee University used emitting micro-light-emitting diodes with ultra-high integration (hereinafter called Micro LED) to create a range of optical components. Pixel sizes are dust and quantum points, which have an excellent color reduction. The table of optical elements should be used to project augmented reality images on the eyes.
Research results were published in the world -renowned university review Nature Communications (IF = 14.919) on April 6.
Since the electronic circuits and substrates manufactured by Micro LED are different, it is difficult to merge. As a rule, electronic circuits are made on silicon substrates, while micro LEDs are made on gallium nitride substrates. To solve this problem, Professor Li’s research team has developed a technology that can transfer a thin layer of gallium nitride which is about a tenth of the thickness of human hair to a silicon substrate.
Based on this technology, the research team has only adopted silicon circuits technology and did not require general display technology, successfully forming the smallest particle size in the world (5 μm).
“The transfer technology is greatly affected by thermal expansion, we therefore focus on the manufacture of thin alloy layers at low temperature,” said Shin Yoo-Seop, a student from the electronic engineering department.
At the same time, the research team used quantum points technology to improve the rate of color reduction, adding a feeling of reality to the RA. Quantum points are very concerned about new generation light emission devices, because it has high color purity and light stability compared to conventional light emission materials, because it can produce various material colors by producing light wavelengths of different lengths for each particle size without modifying the type. However, quantum points are sensitive to various solvents used in general semiconductor processes.
To solve this problem, the research team has developed a “high -resolution dry transfer method” which can selectively form models based on surface energy intensity. They managed to reach the RGB color using the technology of quantum points without solvents. Even when seen through a microscope, the optical pixels developed are very small, they are therefore suitable for small devices such as portable devices. In addition, optical element pixels can clearly project augmented reality images by displaying a high color range.
Enkris publishes color GAN products for micro LED applications
Recently, Enkris Semiconductor has published his GAN micro-color? RGB series products with larger plates of platesDisplay300 mm. It is reported that Enkris semiconductor is located in the industrial park of Suzhou, China. It is a pure foundry company that provides epitaxial chips of gallium nitride (GAN) for power, micro LED and UVC electrical applications.
Gan-on-Si LEDs have advantages compared to other substrates for micro-LED technology in terms of larger plates (200-300 mm) of better surface quality. In addition, Enkris can manufacture micro-micro networks (5? M 2) micro-LED by taking advantage of the most advanced silicon treatment technology of the 200 mm / 300 mm factory and integrate them into cmos of silicon with high yields.
Figure 1: Gan RGB series in Enkris color.
Close-eye screens such as augmented reality (AR) and mixed reality (MR) devices require effective and ultra-fine pixels (<5? M) Red, Green and Blue on the same material platform. Indium gallium (ingan) materials can emit light effectively by adjusting the indium content, covering the entire visible spectrum. Although LEDs Blue Ingan and Effective Green have been obtained, the growth of high -efficiency red LEDs is always very difficult due to the obvious tension in the active region and the major network shift between the quantum wells of ingan, which leads to poor quality of the crystals. Enkris semiconductor successfully surmounts these difficulties using its patented engineering and polarization engineering (Figures 1 and 2).
Figure 2: IQE comparison and EL spectrum of the Gan RVB series in full color on silicon and sapphire.
The uniformity of the wavelength is a key factor in micro-LED screens. Enkris says that its color GAN RGB series has an excellent uniformity of wavelength throughout the 200 mm slice (Figure 3). In addition, the diameter of the Gan-on-Si blue LED plate can reach 300 mm, with a very good wavelength and a standard deviation less than 2 nm (Figure 4).
Figure 3: Mapping WLD LED GAN RVB color gan color.
Figure 4: WLD LED Mappage Blue 300 mm in Enkris.
In addition, Enkris also shows a network of RGB micro LED RGB based on the epitaxial sheet of the RVB Gan series in 200 mm color with a pixel size ranging from 2? M to 50? M (Figure 5 and Figure 6). Thanks to the high quality epitaxial film, all the pixels can be on, even for each 2? M 2 pixels (in a table 100 x 100).
Figure 5: Miniature LED bafonce 200 mm Enkris.
Figure 6: micro-LED table based on the GAN RGB series in complete color.
“For the monolithic integration of micro-LEDs, the integration of three colors into a single material platform with large Gan-on-Si is a key step,” said Dr. Kai Cheng, founder and CEO of Enkris. “Our color Gan series will meet the industry’s requirements for AR / MR systems. In addition, the size of the Gan-on-Si brochure can be amplified at 300 mm, and we launched the Gan-On-Si 1200V 300 mm LED platform in September 2021. The Gan-On-Si LED platform of 300 mm will be integrated heterogeneous in the Gan, Gan Electronic and Gan Electronics Silicon. “.
According to him, Enkris is now able to provide the display industry with real RVB Gan-Si epitaxial solutions and lead the development of color micro-uses. Currently, Gan color products in Enkris color can be used in gan-on-ss and gan-sapphire plates.
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