Light-Transmissive Member Structure for LED Adhesion and Peeling Resistance
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Solution Overview
Problem
Existing light emitting devices face reliability issues due to inadequate adhesion between light-transmissive members and substrates, leading to potential peeling and reduced light extraction efficiency.
Innovation Solution
A light emitting device configuration that includes a light-transmissive member with a sheet-like shape covering the light emitting elements, a first protrusion portion along the outer edge of the light-transmissive member extending over the substrate, and a covering member with light shielding properties, enhancing adhesion and protection from external factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-transmissive member covers the light emitting element, then light extraction efficiency is improved, but adhesion between the light-transmissive member and substrate deteriorates leading to peeling
Solution Approach 1:
The light-transmissive member is divided into a body portion and a protrusion portion. The protrusion portion extends from the body and contacts the substrate to provide dedicated adhesion function, while the body portion maintains light extraction function. This segmentation separates the conflicting functions of light transmission and adhesion.
Solution Approach 2:
The protrusion portion acts as an intermediary element between the light-transmissive member body and the substrate. It provides a mechanical bridge that enhances adhesion without interfering with the light transmission function of the main body, resolving the conflict between coverage and bonding.
2Illumination intensity
If the light-transmissive member is positioned close to the light emitting element for better light extraction, then light extraction efficiency is improved, but protection from external factors deteriorates
Solution Approach 1:
The protective function is extended to a different spatial dimension by adding the protrusion portion that contacts the substrate. This vertical extension provides protection at the substrate interface level while the horizontal coverage by the body portion maintains light extraction efficiency.
Solution Approach 2:
Protection function is segmented between the body portion (providing coverage protection) and the protrusion portion (providing substrate interface protection). This allows comprehensive protection without compromising light extraction.
3Reliability
If adhesion between light-transmissive member and substrate is enhanced, then reliability is improved, but device complexity increases
Solution Approach 1:
The adhesion enhancement function is merged into the light-transmissive member itself through the protrusion portion, eliminating the need for separate adhesion promoters or complex bonding structures. The same component provides both light transmission and adhesion functions.
Solution Approach 2:
The light-transmissive member provides its own adhesion function through the protrusion portion that contacts the substrate. This self-service approach enhances reliability without requiring additional external adhesion mechanisms or increasing overall device complexity.
Data Source
AI summary
Alight emitting device includes: a light emitting element; a first substrate having an upper surface comprising an element placement region on which the light emitting element is disposed; a light-transmissive member with a sheet-like shape that covers the light emitting element, wherein an outer edge of a lower surface of the light-transmissive member contacts an outer side of the upper surface of the element placement region of the first substrate; and a first protrusion portion disposed along an outer edge of an upper surface of the light-transmissive member and extending across an upper surface of the first substrate and the upper surface of the light-transmissive member, wherein the first protrusion portion comprises a top portion located higher than an upper surface of the light emitting element.