LED Package Series Connection with Distributed Bragg Reflective Protection

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Solution Overview

Problem

Current light emitting devices face challenges in achieving high light emission efficiency and preventing electrode detachment or damage, which are crucial for competitive luminance and longevity in LED technology.

Innovation Solution

The design incorporates a light emitting structure with distributed bragg reflective layers and a connection electrode system that connects light emitting regions in series, enhancing light extraction efficiency and protecting electrodes through a second distributed bragg reflective layer that covers the connection electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If connection electrodes are exposed to connect light emitting regions in series, then electrical connectivity is achieved, but electrodes may be detached or damaged

Engineering Contradiction:

Improveelectrode stabilityVSAvoidprotective layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A second distributed bragg reflective layer is introduced as an intermediary protective structure that covers the connection electrodes. This layer acts as a mediator that protects the electrodes from mechanical damage and detachment while maintaining their electrical connectivity function through the distributed bragg reflection design.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective structure utilizes composite material design by combining the first distributed bragg reflective layer with the second distributed bragg reflective layer. This composite structure provides both optical reflection functionality and mechanical protection for the connection electrodes, resolving the contradiction between reliability and complexity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If distributed bragg reflective layers are used to increase light extraction efficiency, then light emission efficiency is improved, but device structure becomes more complex

Engineering Contradiction:

Improvelight emission efficiencyVSAvoidlayer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The distributed bragg reflective layers serve multiple functions simultaneously: they extract light from the active layer to improve emission efficiency, provide structural organization for the connection electrodes, and when combined with the second layer, offer protective functionality. This multi-functionality resolves the contradiction by making the complex structure serve multiple purposes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If light emitting regions are connected in series through connection electrodes, then voltage dependency on number of sub-LEDs is achieved, but electrodes may be damaged

Engineering Contradiction:

Improvevoltage control capabilityVSAvoidelectrode durability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The connection electrode structure is segmented and organized through the first and second distributed bragg reflective layers. This segmentation allows the electrodes to be properly positioned and protected while maintaining their series connection function, enabling voltage control based on the number of light emitting regions without compromising electrode durability.

Inventive Principle:

Principle #1Segmentation

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

This configuration improves light emission efficiency by reducing absorption and increasing the light emitting area, while preventing electrode detachment and damage, thereby enhancing the overall performance and reliability of the light emitting device.

Implementation Method 1

a first distributed bragg reflective layer disposed on the light emitting regions

Methodology Applied

Scientific EffectDistributed bragg reflection: Bragg Diffraction

Implementation Method 2

at least one connection electrode disposed on the first distributed bragg reflective layer such that the connection electrode sequentially connects the light emitting regions in series

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

a light emitting structure includes a plurality of light emitting regions including a first semiconductor layer, an active layer and a second semiconductor layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP2587542B1Light emitting device and light emitting device package

Publication Date: 2018.02.28 LG INNOTEK CO LTD

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AI summary

Disclosed is a light emitting device including a light emitting structure including a plurality of light emitting regions comprising a first semiconductor layer, an active layer and a second semiconductor layer, a first distributed bragg reflective layer disposed on the light emitting regions, a first electrode unit disposed on the first semiconductor layer in one of the light emitting regions, a second electrode unit disposed on the second semiconductor layer in another of the light emitting regions, an intermediate pad disposed on the first semiconductor layer or the second semiconductor layer in at least still another of the light emitting regions, and at least one connection electrode disposed on the first distributed bragg reflective layer such that the connection electrode sequentially connects the light emitting regions in series.