Light-Emitting Package Structure to Suppress Void Light Leakage
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Solution Overview
Problem
Existing light-emitting devices face challenges in maintaining luminous flux due to light leakage through voids in inorganic members, which affects their efficiency and performance.
Innovation Solution
The proposed light-emitting device incorporates a light-emitting element with a light-transmissive member, an inorganic member with voids, and a light-reflective member that is impregnated into the voids of the inorganic member, enhancing light reflection and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a light-emitting device uses an inorganic member with voids for heat dissipation and structural support, then thermal management is improved, but light leakage occurs through the voids reducing luminous flux
Solution Approach 1:
A light-reflective member is introduced as an intermediary substance that fills the voids of the inorganic member. This mediator serves dual purposes: maintaining the void structure for heat dissipation while reflecting light back toward the extraction surface, thereby preventing light loss through the voids.
Solution Approach 2:
The device employs a composite structure combining the inorganic member (for thermal management) with the light-reflective member (for optical performance). This composite approach allows simultaneous achievement of heat dissipation through the inorganic voids and light reflection through the impregnated reflective material.
2Loss of energy
If a light-reflective member is placed on the lateral surface to prevent light leakage, then luminous flux is improved, but light may still escape through voids in the inorganic member
Solution Approach 1:
The light-reflective member is nested within the voids of the inorganic member, creating a hierarchical structure where the reflective material is embedded in the porous network. This nested configuration ensures that light reflecting off the inorganic member surfaces is captured and redirected by the impregnated reflective member.
Solution Approach 2:
The inorganic member's porous/void structure is utilized and enhanced rather than eliminated. The voids are filled with light-reflective material that maintains the porous architecture for heat dissipation while adding optical reflection functionality throughout the three-dimensional network.
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 configuration effectively suppresses the decrease in luminous flux by improving light reflection and heat dissipation, leading to enhanced performance and efficiency of the light-emitting device.
Implementation Method 1
a light-reflective member in contact with at least part of the inorganic member... a portion of the light-reflective member is impregnated in at least a portion of the plurality of voids of the inorganic member
Data Source
AI summary
A light-emitting device includes: a light-emitting element having a first surface as a light extraction surface, a second surface on an opposite side of the first surface, and a lateral surface connecting the first surface and the second surface and including an element electrode on the second surface; a substrate including a wiring member electrically connected to the element electrode; a light-transmissive member disposed above the first surface of the light-emitting element and allowing light from the light-emitting element to pass through; an inorganic member including a plurality of voids and disposed, on the substrate, on a lateral surface or lateral to the light-emitting element and on a lateral surface of the light-transmissive member; and a light-reflective member in contact with at least part of the inorganic member. A portion of the light-reflective member is impregnated in at least a portion of the plurality of voids.