Light Emitting Device Metal Layer Lateral Light Leakage
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Solution Overview
Problem
Existing light emitting devices face challenges in reducing light leakage from their lateral surfaces, which hinders their downsizing and efficiency, especially when using reflecting members made of resin mixed with titanium oxide or ceramic.
Innovation Solution
The light emitting device incorporates a light-transmissive member with a first and second metal layer covering its lateral surfaces, positioned between an insulating member and a protective member, to minimize light leakage while maintaining a thin profile, utilizing high reflectivity metals like aluminum or silver for the metal layers and thermosetting resins for the protective members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a reflecting member made of resin mixed with titanium oxide or ceramic is used to surround the light emitting region, then light leakage is reduced and distinguishability is improved, but the device thickness increases
Solution Approach 1:
The patent changes the material parameter from resin/ceramic composite to metal material with higher reflectivity. This parameter change allows achieving the same light leakage prevention function with a thinner structure, as metal's superior reflective properties compensate for the reduced thickness.
Solution Approach 2:
The patent uses a composite structure combining metal material with the light-transmissive member. This composite approach allows the metal layer to provide high reflectivity for light leakage prevention while the overall structure maintains thinness through optimized material combination.
2Length of stationary object
If the thickness of the reflecting member is reduced to downsize the light emitting device, then device size is reduced, but light leakage from lateral surfaces increases
Solution Approach 1:
The patent changes the material parameter to metal with inherently higher reflectivity, which compensates for the reduced thickness. This allows the reflecting member to maintain effective light leakage prevention even when the overall device size is reduced.
3Object-generated harmful factors
If metal material is used for the reflecting member instead of resin mixed with titanium oxide, then reflectivity is improved and light leakage is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the metal reflecting member with the light-transmissive member into an integrated structure. The metal layer is formed on the lateral surfaces of the light-transmissive member, combining the light guiding function with the light reflection function in a single integrated component, thereby reducing manufacturing complexity.
Solution Approach 2:
The patent uses a thin metal film or layer formed on the light-transmissive member rather than a bulky metal component. This thin-film approach simplifies manufacturing while maintaining the light leakage prevention function, as the metal layer can be applied conformally to the existing structure.
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 reduces light leakage from the lateral surfaces, enabling the production of thinner, more efficient light emitting devices with improved distinguishability and reduced manufacturing costs.
Implementation Method 1
a first metal layer that covers the one or more light-transmissive member lateral surfaces of the light-transmissive member; and a second metal layer that covers the one or more light emitting element lateral surfaces
Data Source
AI summary
A light emitting device includes: a light emitting element that includes a light extracting surface, an electrode formed surface opposite to the light extracting surface, one or more lateral surfaces, and a pair of electrodes positioned on the electrode formed surface; a light-transmissive member that includes a light entering surface, a light exiting surface opposite to the light entering surface, and one or more lateral surfaces, the light entering surface being disposed on the light extracting surface; an insulating member that covers the lateral surfaces and the electrode formed surface of the light emitting element, and is disposed to expose at least part of the pair of electrodes; a first metal layer that covers the lateral surfaces of the light-transmissive member; and a second metal layer that covers the lateral surfaces of the light emitting element interposing the insulating member.