Dual Adhesive Light-Emitting Device for Optical Stability
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Solution Overview
Problem
Existing light-emitting devices face challenges in maintaining a stable adhesive state due to the degradation of adhesive agents under light exposure, which affects the long-term reliability and performance of the devices.
Innovation Solution
The use of a dual adhesive system, where a first adhesive agent with lower light resistance is combined with a second adhesive agent that has better resistance to light, ensuring that even if the first adhesive part degrades, the second adhesive parts maintain the optical member's fixation to the base structure, thereby stabilizing the adhesive state over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single adhesive agent is used to bond the optical member to the base structure, then the bonding process is simple and cost-effective, but the adhesive state becomes unstable under light exposure over time
Solution Approach 1:
The adhesive system is segmented into multiple adhesive agents with different light resistance characteristics. The first adhesive agent (UV curing resin) provides initial bonding, while the second adhesive agent (epoxy resin) provides long-term stability. This segmentation allows each adhesive to perform its specialized function, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent uses a composite adhesive system combining different material types (UV curing resin and epoxy resin) to achieve properties that neither material could provide alone. The composite approach ensures both initial bonding strength and long-term light resistance, addressing the reliability issue while accepting controlled complexity.
2Strength
If the first adhesive agent is positioned to provide strong initial bonding, then bonding strength is improved, but the adhesive parts may interfere with each other and cause instability
Solution Approach 1:
Different adhesive agents are placed in specific local regions with distinct functions. The first adhesive agent is positioned at the center for strong initial bonding, while the second adhesive agent is positioned at the periphery for long-term stability. This local quality differentiation prevents interference while maintaining both strength and stability.
Solution Approach 2:
The first adhesive agent acts as an intermediary that provides initial bonding and positioning, while the second adhesive agent serves as a mediator that ensures long-term stability. The coordinated action of these intermediary substances resolves the contradiction between strength and stability.
3Area of stationary object
If adhesive agents are placed close together to save space, then device compactness is improved, but the adhesive parts may contact and degrade each other under light exposure
Solution Approach 1:
The adhesive agents are assigned different spatial zones with specific quality requirements. The first adhesive agent occupies the central region where strong bonding is needed, while the second adhesive agent occupies the peripheral region where light resistance is critical. This spatial quality differentiation prevents harmful interactions while maintaining compactness.
Solution Approach 2:
The patent arranges adhesive agents in a two-dimensional pattern (center and periphery) rather than simply spreading them linearly. This dimensional arrangement optimizes both space utilization and light resistance, resolving the contradiction between compactness and reliability.
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 approach enhances the stability and longevity of the light-emitting device by preventing adhesive failure under light exposure, ensuring consistent performance and reducing positional displacement of the optical member, thus maintaining optimal optical characteristics.
Implementation Method 1
The first adhesive parts are formed by curing a first adhesive agent. The first adhesive parts are disposed respectively in the first region and the second region of the second surface at positions between the second surface and the optical member and fixing the optical member to the base structure.
Implementation Method 2
The second adhesive parts are formed by curing a second adhesive agent different from the first adhesive agent. The second adhesive parts are disposed such that a pair of the second adhesive parts are respectively located at both opposite sides of a corresponding one of the first adhesive parts in the first region on the second surface without being in contact with the corresponding one of the first adhesive parts
Data Source
AI summary
A light-emitting device includes a base structure, a light-emitting element, an optical member, and first and second adhesive parts. The first adhesive parts are disposed in first and second regions of a second surface of the base structure. The second adhesive parts are located at both opposite sides of the first adhesive part without being in contact with the first adhesive part. In the top view, a virtual first line segment, which connects two points respectively on the first adhesive parts in the first and second regions, extends across a first surface of the base structure. A virtual line segment, which connects two points respectively on the second adhesive parts at the both opposite sides of the first adhesive part, does not extend across the first surface. A width of the first adhesive part along the line segment is greater than a width of the second adhesive part.