Resin Support Member Light Shielding for LED Reliability
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Solution Overview
Problem
Resin materials used in light emitting devices deteriorate rapidly due to light irradiation, especially in high-humidity environments, affecting the dielectric strength voltage and reliability of the mount substrate.
Innovation Solution
A light emitting device design that includes a flexible resin support member with vaporproof and light reflective features, such as a vaporproof member with high moisture vapor permeability rate and a light reflective film, to prevent light-induced deterioration by shielding the support member from direct light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin support member is used in a light emitting device, then flexibility and ease of manufacture are improved, but the support member deteriorates rapidly due to light irradiation and moisture vapor permeation, worsening reliability
Solution Approach 1:
The support member is constructed as a composite structure comprising a resin base material combined with a vaporproof layer having superior moisture barrier properties. This composite configuration allows the support member to maintain the flexibility and ease of manufacture of resin materials while the vaporproof layer prevents moisture vapor permeation that would otherwise cause deterioration and reliability issues under high-humidity conditions
Solution Approach 2:
A vaporproof layer is introduced as an intermediary component between the resin support member and the external high-humidity environment. This intermediate layer acts as a barrier that blocks moisture vapor from reaching and deteriorating the resin material, thereby protecting the support member's reliability without compromising its inherent manufacturing advantages
2Adaptability or versatility
If light emitting elements are arranged on a resin base, then device flexibility is improved, but light from the elements deteriorates the resin base, worsening dielectric strength voltage
Solution Approach 1:
A light shielding layer is introduced as an intermediary between the light emitting elements and the resin base material. This intermediate layer blocks light from reaching the resin, preventing photo-degradation that would otherwise reduce dielectric strength voltage, while allowing the device to maintain its flexibility through the resin support structure
Solution Approach 2:
The support member is constructed as a composite structure comprising a resin base material combined with a light shielding layer having superior light blocking properties. This composite configuration allows the support member to maintain the flexibility of resin materials while the light shielding layer prevents light-induced deterioration that would otherwise reduce dielectric strength voltage
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 effectively extends the lifespan of the resin support member by reducing moisture vapor permeation and light-induced degradation, enhancing the reliability and durability of the light emitting device, particularly under high-humidity conditions.
Implementation Method 1
the vaporproof member has higher vaporproof property than that of the support member
Implementation Method 2
a light reflective film, to prevent light-induced deterioration by shielding the support member from direct light exposure
Data Source
AI summary
A light emitting device is provided that can restrain deterioration of a mount substrate made of resin, the light emitting device including: a support member that is made of resin; a pair of wirings that are arranged on the support member; a light emitting element that is arranged to cross the pair of wirings and that has a pair of electrodes on one side running in parallel to the pair of wirings so as to be electrically connected; and a vaporproof member in a film shape that seamlessly covers an upper face of the support member, at least, in a region where the light emitting element is arranged between the pair of wirings in a plan view, wherein the vaporproof member has a higher vaporproof property than that of the support member.