LED Side Reflection Layer for Narrow Viewing Angle Control

The patent applies local quality by creating different surface properties at different locations. The light exit surface has a roughened surface with specific microstructures to enhance light extraction, while the side surfaces are covered with reflection layers to redirect light. This localized differentiation allows the LED to achieve narrow viewing angle (reducing light loss in specific directions) while maintaining effective light emission through the optimized light exit surface.

The patent converts the harmful effect of light escaping through side surfaces into a beneficial effect by using reflection layers. Instead of allowing light to be lost through the sides, the reflection layers redirect this light back toward the light exit surface, where it can be properly extracted. This transforms what would be wasted light into useful emission, reducing overall light loss while controlling the viewing angle.

The reflection layer serves multiple functions simultaneously: it reflects light from side surfaces back toward the light exit surface, provides electrical connection pathways, and can be integrated with existing LED structures. By making the reflection layer multi-functional, the patent reduces the need for separate components, thereby controlling device complexity while achieving narrow viewing angle.

The patent merges the reflection layer with other LED components such as electrode structures or packaging elements. Instead of adding a completely separate reflection component, the design integrates reflective properties into existing structural elements, thereby achieving the desired viewing angle control without proportionally increasing device complexity.