Taiwan Chiao Tung University And Finnish Picosun Jointly Develop A Three-in-one RGB MiniLED

- Jan 17, 2021-

Taiwan Chiao Tung University and Finnish Picosun jointly develop a three-in-one RGB MiniLED

The development of MiniLED and Micro LED has attracted attention due to the vigorous development of related products such as displays. TrendForce said that Micro LED display technology is expected to grow from augmented reality with small-sized heads, watches with wearable displays, and high-margin products in the future. Niche products such as automotive displays, high-end TVs, and large-scale commercial displays enter the market. In the future, they will have the opportunity to slowly penetrate into the development of mid-size flat panel, laptop, and desktop displays.

Micro LED is the most explosive in the large-scale display market. The main reason is the relatively low technical threshold. It is estimated that in 2024, the chip output value of Micro LED TV and large-scale display applications will reach 2.3 billion US dollars. However, there are still many technical challenges in the development process of Micro LED, such as wafer preparation, yield yield, massive transfer, package heat dissipation, and integrated driving. The above technical difficulties not only raise the production cost of Micro LED, but also hinder The emergence and application of commercial products have also derived MiniLED with relatively mature technology, which is the beginning of the development of Micro LED.

2021 US Consumer Electronics Show (CES) will be fully digital for the first time. Innolux and Samsung (The Wall TV) will exhibit a series of MiniLED backlight large-size TV and car display solutions through the online exhibition platform, actively seizing wisdom Business opportunities in fields such as entertainment and smart cars.

The research team of Professor Guo Haozhong and Professor Lin Jianzhong of Taiwan Jiaotong University have jointly developed a three-in-one RGB MiniLED technology that can be applied to in-vehicle display products that require high color saturation and resolution in the market. This technology development can not only The general fine-pitch display technology has been upgraded to a smaller fine-pitch, and through the high-precision super-macro quantum dot spraying technology (SIJ), the blue MiniLED and the red and green quantum dots are combined with each other, and the whole is realized in the form of a single chip. Colorful and high-quality MiniLED arrays.

Another big improvement is to reduce the transfer and bonding time by 2/3. Professor Guo mentioned in an interview: "The challenge of this technology is that quantum dots will reduce the color conversion efficiency with the risk of luminous efficiency degradation. Therefore, we cooperated with Taiwan Picosun to introduce atomic layer deposition (ALD) thin film passivation protection technology. To make quantum dots less susceptible to external environments (such as moisture and oxygen) and the temperature of the film-forming environment, the application of ALD technology is particularly important for quantum dot-related applications."

Peihan Chung, Business Associate in Taiwan of Picosun, Finland, also said: "MiniLED and Micro LED have always been an important market that we pay attention to. Atomic layer deposition technology is a very important key technology for the reliability of optoelectronic components. Because of the shrinking process of LED chips, The specific area ratio of the sidewall of the chip relative to the light-emitting area is increased, and the interface leakage has a great influence on the brightness (gray scale) operation of the chip. On the other hand, there are many high-end display-related applications, whether it is high-density dynamic contrast or direct sunlight. Obviously, the LED chips and quantum dots used have very high reliability requirements against the environment. Picosun’s ALD technology has been fully prepared in these aspects under the long-term cooperation with the Optoelectronics Department of Jiaotong University and MiniLED manufacturers in Taiwan. "                                

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