Light Emitting Device Recessed Sealing for Bonding
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Solution Overview
Problem
Light emitting devices with integrally formed lenses face issues of reduced light extraction efficiency due to light reflection at the sealing member's inner surface and absorption by the supporting base member, leading to potential detachment and decreased product reliability.
Innovation Solution
A light emitting device design featuring a supporting base member with recesses on its surface, where the sealing member is filled into these recesses to enhance bonding strength and prevent detachment, while maintaining a larger size to minimize light absorption and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the sealing member is made sufficiently larger than the supporting base member to reduce light total reflection and absorption, then light extraction efficiency is improved, but external impact causes detachment at the interface between the sealing member and supporting base member
Solution Approach 1:
The sealing member is divided into two functional parts: a main body portion that contacts the supporting base member and an extension portion that extends outward. This segmentation allows the main body to provide bonding strength while the extension portion maintains the larger perimeter for improved light extraction, resolving the contradiction between bonding strength and light extraction efficiency
Solution Approach 2:
Different parts of the sealing member are given different sizes and functions: the main body portion has a size optimized for bonding to the supporting base member, while the extension portion extends outward to increase the overall perimeter. This local differentiation allows simultaneous optimization of bonding strength and 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
The design effectively suppresses detachment between the supporting base member and sealing member, improving light extraction efficiency and product reliability by increasing the anchor effect and reducing stress distribution.
Implementation Method 1
The supporting base member has at least one recess on a surface. The sealing member is filled in at least a portion of the recess and formed so as to expose an electrode surface of the external electrode.
Data Source
AI summary
A light emitting device includes a supporting base member which has an external electrode, at least one light emitting element disposed on at least a portion of an upper surface of the supporting base member. A sealing member encloses the light emitting element and has an outermost periphery larger than the supporting base member in a plan view. The supporting base member has at least one recess. The sealing member is filled in at least a portion of the recess and is formed so as to expose an electrode surface of the external electrode.