LED Laminate Columnar Sections Stress Distribution Mounting
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Solution Overview
Problem
Light emitting devices with nano-columns experience unstable light emission characteristics and breakage due to stress and strain caused by pressure during junction-down mounting, which affects their strength and reliability.
Innovation Solution
A light emitting apparatus is designed with a laminate structure that includes columnar sections connected by a connecting member, mounted on a second base with a thermal conductivity greater than the first base, and surrounded by an electrically conductive first member that distributes pressure and enhances heat dissipation, thereby reducing stress on the columnar sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If junction-down mounting is used to improve heat dissipation, then heat dissipation efficiency is improved, but stress and strain occur in the nano-columns causing unstable light emission and breakage
Solution Approach 1:
The patent divides the mounting structure into multiple support points (first support portion and second support portion) that separately support different regions of the semiconductor layer, distributing the mechanical stress away from the nano-columns while maintaining thermal contact for efficient heat dissipation.
Solution Approach 2:
The patent introduces an intermediary mounting structure that contacts the semiconductor layer at specific support portions rather than directly pressing on the nano-columns. This intermediary structure mediates between the need for mechanical support/heat dissipation and the need to protect the nano-columns from stress.
2Reliability
If pressure is applied during mounting to ensure contact, then mounting reliability is improved, but stress and strain occur in the nano-columns causing breakage
Solution Approach 1:
The patent applies local quality by designing specific support portions (first and second support portions) with different functions: one for mechanical support and another for electrical contact, ensuring that pressure is applied only at appropriate locations that do not compromise the nano-column structure.
Solution Approach 2:
The patent provides beforehand cushioning by designing the mounting structure to inherently distribute stress through multiple support points before mounting occurs, preventing stress concentration on the nano-columns during the mounting process itself.
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 improves the strength of the columnar sections, stabilizes light emission, and enhances heat dissipation, reducing the likelihood of breakage and maintaining reliable performance under varying environmental conditions.
Implementation Method 1
a thermal conductivity of the second base may be greater than a thermal conductivity of the first base
Data Source
AI summary
The light emitting apparatus includes a light emitting device including a first base at which a laminate is provided and a second base at which the light emitting device is provided. The laminate includes a first semiconductor layer, a second semiconductor layer of a conductivity type different from the conductivity type of the first semiconductor layer, and a light emitting layer provided between the first semiconductor layer and the second semiconductor layer and capable of emitting light when current is injected into the light emitting layer. The laminate includes a plurality of columnar sections. Connecting member is so provided between the adjacent columnar sections as to be connected to the adjacent columnar sections. The laminate is connected to the second base on the side opposite the first base.