Light Emitting Device Package Reflective Resin Layer Design

The patent applies local quality by making the reflective layer's reflectivity position-dependent. The reflectivity increases as the distance from the light emitting element decreases, with the reflective layer comprising multiple layers (first, second, third reflective layers) with progressively higher reflectivity. This gradient structure ensures uniform light extraction efficiency across different regions of the package while maintaining improved luminance.

The patent applies preliminary action by forming a protective layer on the bonding pad before the re-bonding process. This protective layer prevents oxidation and contamination of the bonding pad surface, ensuring that when re-bonding occurs, the electrical characteristics are maintained or improved without causing re-melting phenomena. The protective layer is removed only after the bonding process is complete.

The patent applies the extraction principle by separating the phosphor layer from the light emitting device. Instead of disposing the phosphor layer adjacent to the light emitting device, the patent positions the phosphor layer at a distance, allowing efficient light conversion while preventing deterioration from direct exposure to heat and electromagnetic radiation from the light emitting device.

The patent applies composite materials by combining the transparent resin layer with a reflective layer having position-dependent reflectivity. The transparent resin layer prevents discoloration and maintains appearance quality, while the underlying reflective layer with varying reflectivity compensates for any light extraction reduction, ensuring overall luminance is improved or maintained.