Nationstar Optoelectronics has developed Micro LED nStar Ⅱ, with a mass transfer and bonding yield of 99.99%

With the rise of new ultra-high-definition display applications in the 5G era, Micro LED has attracted much attention as a new generation of mainstream display technology. This technology has many advantages such as high resolution, high brightness, high color saturation, high reliability, low power consumption, low latency, narrow borders, and long life. It can be widely used in large-sized ultra-high-definition video walls and smart screens, small and medium-sized car screens and smart watches, and various sizes of consumer electronics such as VR/AR. The future prospects are promising.

Following the first generation of glass-based transparent passive drive Micro LED display module - nStar Ⅰ, Nationstar Optoelectronics recently launched the second generation of new Micro LED product - nStar Ⅱ. nStar Ⅱ is a 3.5-inch glass-based Micro LED full-color display with a pixel pitch of 300 microns (P0.3). It uses TFT driver to achieve an 8-bit (256 gray scale) color depth display effect; based on self-built Micro LED The technological innovation research and development platform has simultaneously overcome the dual technical problems of mass transfer and mass bonding, and its comprehensive yield has increased to 99.99%. The relevant technological achievements are expected to be widely used in high-definition display products such as large-size spliced smart screens in the future.

Micro LED Display:nStar Ⅱ

nStar Ⅱ glass-based active driver Micro LThe ED display uses mass transfer technology to bond Micro LED microchips to the glass substrate, and uses TFT drivers to achieve high-definition screen display. In the process of iterating towards smaller and higher-density LED chip integration processes, TFT glass substrates that can obtain ultra-fine circuit structures on large areas are the ideal technology choice. The active driving TFT backplane can not only realize independent control of Micro LED module pixels and avoid crosstalk of driving pixels, but also greatly reduce power consumption while improving the uniformity of module display brightness.

As a leader in LED packaging technology, Nationstar Optoelectronics took the lead in establishing the Mini & Micro LED Research Center in China in 2018, and established the Guangdong Provincial Key Laboratory of Semiconductor Micro Display in 2020. It aims to strengthen collaboration with academia and industry, join forces with all links in the upstream, midstream and downstream of the industrial chain, concentrate its superior resources to overcome technical problems in the micro display industry, work together to break the bottleneck of technology development, and jointly promote the Mini/Micro LED industrialization process. At present, the company has made breakthroughs in many key technologies in the Micro LED field such as mass transfer, eutectic bonding, full-color quantum dots, detection and repair, and high-reliability packaging. It has applied for more than 100 invention patents in the Mini/Micro LED field. Next, Nationstar Optoelectronics will delve deeply into the new micro-display track and will focus on the glass-based Micro LED technology route.High-end smart screens, car displays and smart watches; in terms of silicon-based Micro LED technology routes, it focuses on the AR display field.

In the digital age, the display industry has become a key cornerstone for upgrading information consumption, strengthening the digital economy, and developing the electronic information industry. The era of Mini/Micro LED is coming. Nationstar Optoelectronics will further leverage its advantages in resource integration in the LED vertical industry chain to accelerate the promotion of more comprehensive and extensive commercial display applications of Mini/Micro LED.