Double-Layer Metasurface Integrated with Micro-LED for Naked-Eye 3D Display

Area of Science:

• Optoelectronics
• Metasurface technology
• Display technology

Background:

• Naked-eye 3D micro-light-emitting diode (micro-LED) displays face challenges with light divergence, non-coherence, and limited viewing angles at high luminous efficiency.
• Current micro-LED 3D display technology is largely conceptual, hindering practical implementation.

Purpose of the Study:

• To propose and simulate a novel double-layer metasurface film for micro-LED naked-eye 3D display systems.
• To address the intrinsic emission property limitations of micro-LEDs for improved 3D display performance.

Main Methods:

• Numerical simulations utilizing the 3D finite-difference time-domain (FDTD) method.
• Design and integration of a double-layer metasurface film with collimation and multi-deflection functionalities.

Main Results:

• The double-layer metasurface film successfully restricts 90% of micro-LED emitted light to a near-0° angle, enhancing spatial coherence.
• Achieved a large outgoing viewing angle range from -45° to 45° with low crosstalk.
• Demonstrated a deflection efficiency exceeding 80% and a pixel density up to 605 pixels per inch.

Conclusions:

• The proposed double-layer metasurface film offers a feasible solution for realizing high-performance naked-eye 3D micro-LED displays.
• This design enables wide fields of view, reduced crosstalk, and high resolution, advancing 3D display technology.