48 × 48 pixelated addressable full-color micro display based on flip-chip micro LEDs

Area of Science:

• Optoelectronics
• Materials Science
• Semiconductor Devices

Background:

• Micro-LED displays offer high brightness and contrast.
• Integrating red, green, and blue LEDs on a silicon substrate presents fabrication challenges.
• Existing methods often involve complex processes like wire bonding, limiting miniaturization and speed.

Purpose of the Study:

• To design and fabricate a compact, high-resolution full-color LEDoS micro display.
• To demonstrate an efficient integration method for monochromatic micro-LEDs onto a silicon platform.
• To achieve individually addressable pixels without wire bonding for improved performance.

Main Methods:

• Fabrication of a 48x48 pixelated addressable metallization pattern on a silicon substrate.
• Integration of red, green, and blue monochromatic micro-LEDs using transfer printing.
• Utilizing flip-chip structures for micro-LEDs, including substrate transfer, mesa etching, and dicing for red LEDs.

Main Results:

• Successful design and fabrication of a 48x48 full-color LEDoS micro display.
• Demonstration of wire-bond-free integration, reducing pixel size and increasing assembly speed.
• Individual addressability of each LED pixel, enabling the display of patterns.

Conclusions:

• The developed LEDoS micro display technology offers a promising solution for compact, high-performance displays.
• The transfer printing integration method is effective for high-density micro-LED assembly.
• This approach paves the way for advanced micro-display applications requiring high resolution and speed.