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Full-angle chip scale package of mini LEDs with a V-shape packaging structure.
Optics Express
|April 4, 2024
Summary
This study introduces a novel primary optical design for light-emitting diodes (LEDs) to achieve full-angle emission without lenses. This innovation enhances uniformity and reliability for large-area LED applications.
Area of Science:
- Optics and Photonics
- Solid-State Lighting
Background:
- Light-emitting diodes (LEDs) typically exhibit Lambertian light distribution.
- Secondary optics are often required to modify LED light distribution for uniform, large-area applications.
- Existing secondary optical components present challenges like alignment, aging, and reduced reliability.
Purpose of the Study:
- To propose a primary optical design for achieving full-angle emission in LEDs without secondary optical components.
- To overcome the limitations associated with traditional secondary optics in LED applications.
Main Methods:
- Utilized a flip-chip as the light source.
- Developed a V-shaped packaged structure incorporating a white wall layer, optical structure layers, and a V-shaped diffuse structure.
- Focused on primary optical design to achieve desired light distribution.
Main Results:
- Achieved full-angle emission from LEDs without lenses.
- Experimental results showed a peak intensity angle of 77.7°.
- Observed a 20.3% decrease in central point intensity ratio and a full width at half maximum (FWHM) of 175.5°.
Conclusions:
- The proposed primary optical design enables full-angle emission in LEDs, eliminating the need for lenses.
- This approach enhances reliability and allows for thinner light source modules.
- The design is well-suited for thin, large-area, and flexible backlight applications.
