LED Package Resin Layout for Light Extraction and Wire Protection
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Solution Overview
Problem
Existing light emitting devices face challenges in enhancing light emission efficiency, lifetime, and light distribution characteristics, particularly in the arrangement and materials used for sealing and mounting light emitting elements.
Innovation Solution
A light emitting device design featuring a substrate with mounted light emitting elements, a dam resin with an inclined surface, and a seal resin, where the dam resin has a protruding portion and is formed from synthetic resin containing white particles, with a transparent resin between the light emitting element and the dam resin, and a conic solid resin covering the bonding wire, optimizing the refractive indices and adhesiveness of the resins to improve light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal resin is used to seal the light emitting element, then the light emitting device can be protected and assembled, but the light emission efficiency may be reduced due to light absorption and scattering by the seal resin
Solution Approach 1:
The patent applies local quality by using different resin materials in different regions: a first resin (transparent or translucent) is used in the light emission area where light extraction is critical, while a second resin (white or colored) is used in non-light-emitting regions for sealing and structural support. This allows the device to maintain both sealing protection and high light emission efficiency by optimizing material properties in each specific location.
2Area of stationary object
If the light emission area is increased by covering wire patterns with white resin, then the area ratio of light emission area improves, but the light distribution uniformity may deteriorate
Solution Approach 1:
The patent uses local quality by applying transparent or translucent resin specifically in the light emission area rather than using white resin throughout. This allows light to pass through uniformly from the light emitting elements without the scattering effects that would create color unevenness, while still enabling the white resin to be used in non-emission areas for structural purposes.
3Device complexity
If bonding wires are exposed without additional resin coverage, then the structure is simpler, but the bonding wires are susceptible to stress and damage
Solution Approach 1:
The patent applies multi-functionality by having the resin material serve multiple purposes: it provides mechanical protection and stress reduction for the bonding wires, maintains optical properties for light extraction, and provides environmental sealing. The resin covers both the light emitting elements and the bonding wires, creating a unified protective structure that addresses multiple concerns simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances light emission efficiency, extends the lifetime of the device, and improves light distribution characteristics by optimizing the refractive indices and adhesiveness of the resins, leading to more efficient light extraction and reduced stress on the bonding wires.
Implementation Method 1
the refractive index of the seal resin is lower than the refractive index of the protruding portion
Implementation Method 2
the dam resin to be formed by a synthetic resin material containing white particles
Data Source
AI summary
A light emitting device has a substrate having a rectangular planar shape, one or a plurality of light emitting elements mounted on the substrate, a dam resin having a frame-like planar shape, arranged so as to surround the light emitting element, and having an inclined surface whose height increases as its distance from the light emitting element increases, and a seal resin arranged in an area surrounded by the dam resin and which seals the light emitting element, and the dam resin has a protruding portion extending and protruding from at least one side toward the opposite side.