Research Progress of Micro-LED Display Technology

Abstract

Micro-LED display technology is considered to be the next generation of display technology, which has the characteristics of high miniaturization, thin film and integration, as well as the advantages of high brightness, high contrast, fast response speed and long service life. However, in the development of Micro-LED display technology, there are still some technical and cost problems to be solved. This paper focuses on the key technologies involved in Micro-LED display technology, such as chip technology, mass transfer, full-color display, bonding and driving technology, the research history and frontier progress of these technologies are reviewed in detail. For chip epitaxy technology, the wavelength uniformity, current density and defect control are emphasized; for chip process, the two main chip structures and the challenges brought by miniaturization are discussed emphatically; for chip integration, full-color display, backplane bonding and driving, several mainstream technical schemes are summarized in turn. Finally, the chip detection and repair technologies and commercial application are introduced.

General strategy for developing thick-film micro-thermoelectric coolers from material fabrication to device integration

“…Batch transfer technology is desirable to be employed, because transferring TE legs one by one is of low efficiency, poor uniformity, and high alignment accuracy requirements. However, the state-of-the-art batch transfer technologies based on vacuum adsorption, electromagnetic force, van der Waals force, laser irradiation, sticky glue, or self-assembly remain plagued with some drawbacks 38 – 40 , including difficulties in transferring high-density micro-component array, low transfer yield due to poor adhesion control, surface pollution of the components, complex and expensive equipment, and inability to transfer non-planar components. Herein, we come up with a batch transfer strategy based on phase change materials (PCMs).…”

Recent advances in micro-pixel light emitting diode technology

“…However, this section only briefly describes detection and repair technologies; for more detailed information, please refer to previous studies. [223][224][225] For commercial applications, a mass transfer yield of 99.9999% and the detection and repair of bad pixels after transfer are required. 223 Bad pixels are known to be caused by open circuits or short circuits that can occur during the LED fabrication and mass transfer process.…”

Nanomaterial Integration in Micro LED Technology: Enhancing Efficiency and Applications

“…In the realm of display technologies, the most important thing is to make micro-LEDs as accurately as possible using the top-down approach, where lithography, etching, and deposition are combined in an intricate manner. Lithography reveals the microLED pattern blueprint, which serves as a starting point for the complex manufacturing process [137]. The rest of the actions heavily rely on this accu racy-based step, as it determines microLEDs' properties and layout.…”

“…This pushes the boundaries of visual display capabilities, and each step contributes to the synergy of processing and technology. It starts with lithography and ends with metal contacts deposition [137].…”