Light Emitting Device Recessed Covering Member Adhesion
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Solution Overview
Problem
Existing light emitting devices face challenges in enhancing light extraction efficiency while maintaining reliability and preventing deterioration of components, particularly in LED systems where adhesion between covering and light-transmissive members is critical for long-term performance.
Innovation Solution
A light emitting device design featuring a covering member with recess or convex portions on its upper surface, where the light-transmissive member is fitted, enhancing adhesion and reliability by ensuring the end faces of both members are aligned on the same plane, thereby improving optical coupling and reducing peeling issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the covering member and light-transmissive member are disposed adjacent to each other on substantially the same plane, then light extraction efficiency is improved, but adhesion between the members deteriorates causing peeling
Solution Approach 1:
The invention transitions from a two-dimensional planar arrangement to a three-dimensional configuration by providing recess portions in the covering member and positioning convex portions of the light-transmissive member within these recesses. This vertical dimensionality change enables both high light extraction efficiency (by maintaining end faces on the same plane) and strong adhesion (through the recess-convex interlocking structure), thereby resolving the technical contradiction.
2Illumination intensity
If the light-transmissive member is positioned to maximize light extraction, then optical coupling efficiency improves, but the structure becomes complex requiring additional recess or convex portions
Solution Approach 1:
The invention applies local quality by providing recess portions only in specific regions of the covering member where adhesion is needed, rather than making the entire structure complex. The recess portions are strategically positioned to interface with convex portions of the light-transmissive member, enabling localized adhesion enhancement while maintaining overall structural simplicity and maximizing light extraction efficiency.
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 enhances adhesion between the covering and light-transmissive members, leading to improved light extraction efficiency, extended lifespan, and increased reliability of the light emitting device by preventing peeling and maintaining optical coupling efficiency.
Implementation Method 1
a light-transmissive member disposed on upper surfaces in a light emitting direction of the light emitting element and the covering member
Implementation Method 2
the covering member has a recess portion or a convex portion on an upper surface thereof
Data Source
AI summary
There is provided a light emitting device including a light emitting element, a covering member for covering a side surface of the light emitting element, and a light-transmissive member disposed on upper surfaces in a light emitting direction of the light emitting element and the covering member and having an end face on substantially the same plane as an end face of the covering member, wherein the covering member has a recess portion or a convex portion on the upper surface, a light emitting surface of the light emitting element and an upper surface other than the recess portion or the convex portion of the covering member are arranged on substantially the same plane, and the light-transmissive member is provided in contact with the recess portion or the convex portion.