Light-emitting Element Package with Reflective Metal Layer

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Solution Overview

Problem

Current light-emitting element packages face issues with discoloration, cracking, reduced light efficiency, heat dissipation, electrical shorts, and manufacturing costs due to light emission from light-emitting devices, which affect reliability and performance.

Innovation Solution

A light-emitting element package design featuring a body with a cavity, frames, and metal layers where the second metal layer extends over an inclined surface and surrounds the first metal layer, effectively reflecting light, dissipating heat, and preventing electrical shorts, while allowing for various material usage and improved manufacturing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If light is emitted from the light-emitting device, then light efficiency is improved, but discoloration and cracking of the package occur

Engineering Contradiction:

Improvelight efficiencyVSAvoidpackage integrity

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent converts the harmful effect of emitted light causing discoloration and cracking by introducing a reflective layer that redirects the light. The reflective layer transforms the harmful light exposure into beneficial light extraction, allowing the light to be reflected toward extraction paths rather than degrading the package materials.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The reflective layer acts as an intermediary between the light-emitting device and the package body. It mediates the interaction by reflecting light away from the package materials that would otherwise undergo photodegradation, while still allowing effective light extraction through designated paths.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by moving object

If light is emitted from the light-emitting device, then light efficiency is improved, but cracking of the package occurs

Engineering Contradiction:

Improvelight efficiencyVSAvoidpackage strength

Core Design Contradiction:

Use of energy by moving objectVSStrength

Solution Approach 1:

The reflective layer converts the harmful light exposure that causes cracking into beneficial light extraction. By reflecting light toward extraction paths, the layer reduces light-induced stress and degradation on the package structure while maintaining or enhancing light output efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If metal layers are added to reflect light and dissipate heat, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveelectrical stabilityVSAvoidpackage structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The metal layer is designed to perform multiple functions simultaneously: it reflects light to improve extraction efficiency, dissipates heat through thermal conduction, and provides electrical connection between components. This multi-functionality reduces the need for separate structures for each function, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the functions of light reflection, heat dissipation, and electrical connection into a single integrated metal layer structure. This consolidation reduces the number of separate components and simplifies the overall package structure while achieving multiple performance goals.

Inventive Principle:

Principle #5Merging (Combining)

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 solution minimizes light-induced discoloration and cracking, enhances light extraction efficiency, improves heat dissipation, and reduces the risk of electrical failures, thereby increasing the reliability and performance of the light-emitting element package.

Implementation Method 1

the second metal layer extends over an inclined surface and the separation portion of the body, and the second metal layer is spaced apart from the first metal layer in the cavity and surrounds the first metal layer

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

improves heat dissipation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11735702B2Light-emitting element package and light source module

Publication Date: 2023.08.22 SUZHOU LEKIN SEMICON CO LTD

AI summary

A light-emitting element package according to an embodiment comprises: a body comprising a cavity; the cavity; a first frame and a second frame arranged on the bottom surface of the cavity; a first metal layer disposed on the first frame; an ultraviolet light-emitting element disposed on the first metal layer; and a second metal layer disposed on the second frame and electrically connected to the second frame, wherein the body comprises a separation portion between the first frame and the second frame, the second metal layer extends over the sloping surface of the cavity and the separation portion of the body, and the second metal layer is spaced apart from the first metal layer in the cavity and surrounds the first metal layer.