Light-emitting Device Package Recessed Bonding for Moisture Sealing
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Solution Overview
Problem
Conventional light-emitting device packages face issues with light emission efficiency, lifespan reduction due to adhesive degradation under deep ultraviolet light, and inadequate moisture sealing, especially in high-temperature and high-humidity environments.
Innovation Solution
A light-emitting device package design featuring a recessed portion around the cavity with a bonding member accommodated in concave portions to enhance bonding area and prevent moisture ingress, combined with a rubber ring for improved sealing between the light-transmitting member and package body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is introduced into the cavity to bond glass and package body, then bonding strength is improved, but light reflection function is deteriorated and adhesive discoloration occurs under deep ultraviolet light
Solution Approach 1:
The adhesive is extracted from the cavity space and relocated to the recessed portion surrounding the cavity. This separation allows the adhesive to perform its bonding function without interfering with light reflection within the cavity or being exposed to deep ultraviolet light that causes discoloration.
Solution Approach 2:
The bonding structure is segmented into two distinct zones: the cavity space reserved for light reflection and the recessed portion for adhesive placement. This segmentation isolates the adhesive from harmful UV exposure while maintaining bonding functionality.
2Reliability
If adhesive is used to prevent moisture entry, then sealing function is improved, but adhesive decomposition occurs under deep ultraviolet light causing bond failure
Solution Approach 1:
The adhesive is extracted from the UV-exposed cavity environment and placed in the recessed portion, protecting it from photodecomposition while maintaining its moisture sealing function at the package periphery where UV exposure is minimal.
Solution Approach 2:
The recessed portion structure provides beforehand protection against UV-induced adhesive decomposition by physically shielding the adhesive from deep ultraviolet light before degradation can occur, thereby extending package lifespan.
3Strength
If bonding area is increased to improve bonding strength, then bonding reliability is improved, but adhesive exposure to UV light increases causing more discoloration
Solution Approach 1:
The recessed portion provides a localized UV-shielded environment for the adhesive, allowing extensive bonding area to be achieved without proportional increase in UV exposure. The local geometry of the recessed portion creates a protective niche that maintains bonding reliability while minimizing harmful UV effects.
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 design enhances light emission efficacy, extends the package's lifespan, and provides effective waterproofing, vapor resistance, and dustproofing by preventing external moisture and dust from entering the cavity.
Implementation Method 1
the rubber ring may prevent, for example, external moisture, water or gas-type impurities from being introduced into the cavity C
Implementation Method 2
a bonding member accommodated in the at least one concave portion so as to allow the light-transmitting member and the package body to be bonded to each other
Data Source
AI summary
A light-emitting device package according to an embodiment includes a package body including a cavity and a recessed portion formed around the cavity, the recessed portion having at least one concave portion; at least one light-emitting device mounted in the cavity; a light-transmitting member disposed to cover a top of the cavity and configured to transmit light emitted from the at least one light-emitting device; and a bonding member accommodated in the at least one concave portion so as to allow the light-transmitting member and the package body to be bonded to each other in the recessed portion.