Abstract
As LEDs continue to miniaturize, in addition to the side‐wall defect effect causing a decrease in LED luminous efficiency, the reduction in LED size also leads to the emergence of downward and lateral light emission. These non‐forward emissions are prone to total internal reflection and significant refraction at interfaces between packaging layers and air, consequently diminishing forward light emission. To mitigate the loss of forward luminance and ambient light reflection, we propose a secondary‐optical design and simulate the physical model by commercial software. The simulation result shows that the loss was reduced from 40.06% to 18.51% with Hexagonal Structure, and the ambient light reflection was reduce from 25.41% to 4.78%. With the addition of microlens array, loss can be further reduced to 2.67%, and ambient light reflection was reduced to 5.34%.
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