LED Package Reflective Resin Surface for Light Extraction
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Solution Overview
Problem
Existing light emitting devices face challenges in achieving efficient light extraction due to restrictions in reducing the surface area of the resin member while maintaining electrical insulation and mechanical support for the leads, which affects light absorption and overall efficiency.
Innovation Solution
A reflecting member is applied to cover the exposed surface of the resin member within the resin frame, reducing light absorption and enhancing light extraction efficiency without compromising the structural integrity and insulation of the leads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the surface area of the resin member is reduced to improve light extraction efficiency, then light absorption by the resin member decreases, but the electrical insulation and mechanical support functions may be compromised
Solution Approach 1:
A reflecting member is introduced as an intermediary substance between the resin member and the light emitting element. This reflecting member covers the exposed surface of the resin member, preventing light absorption by the resin while maintaining the electrical insulation and mechanical support functions. The reflecting member acts as a mediator that redirects light away from the resin, thereby reducing energy loss without compromising structural integrity.
Solution Approach 2:
The patent converts the harmful light absorption by the resin member into a beneficial reflection. By applying a reflecting member to the resin surface, light that would have been absorbed and lost is instead reflected back toward the light emitting element, improving overall light extraction efficiency. This transforms the resin's light-absorbing property from a disadvantage into an opportunity for enhanced light management.
2Loss of energy
If the surface area of the resin member is reduced to improve light extraction efficiency, then light absorption decreases, but the mechanical support for leads may be weakened
Solution Approach 1:
The reflecting member serves as an intermediary that allows the resin member surface to be minimized for light extraction purposes while the reflecting member itself provides additional structural support. The reflecting member is applied to cover the exposed resin surface, and this coating layer contributes to the overall mechanical strength and support structure for the leads.
Solution Approach 2:
The patent creates a composite structure by combining the resin member with a reflecting member coating. This composite material approach allows the system to simultaneously achieve light extraction efficiency (through the reflecting member's optical properties) and mechanical support (through the combined structural properties of both materials). The reflecting member and resin member work together as a composite system that addresses both optical and mechanical requirements.
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 light extraction efficiency by minimizing light absorption, allows for flexible design and manufacturing processes, and results in a highly reliable and cost-effective light emitting device with reduced size.
Implementation Method 1
At least a portion of the second surface is covered with a reflecting member. The light emitting device exhibits good light extraction efficiency of the light emitting element.
Data Source
AI summary
A light emitting device includes: a base member including: a first lead, a second lead, and resin member supporting the first lead and the second lead, wherein each of a surface of the first lead that includes a first surface, a surface of the second lead, and a surface of the resin member that includes a second surface are positioned at an upper surface of the base member; a light emitting element located at the surface of the first lead; a resin frame located at the upper surface of the base member, where the first surface and at least a portion of the second surface are exposed inward of the resin frame; and a reflective member covering at least a portion of the second surface. Projections are located on the upper surface of the resin member that forms a portion of the upper surface of the base member.