Light Emitting Device Frame and Sealing Member for Color Uniformity
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Solution Overview
Problem
Existing light emitting devices face issues with color unevenness and luminance unevenness due to the arrangement of light emitting elements, which current technologies have not adequately addressed.
Innovation Solution
A light emitting device design featuring a substrate with concentric first and second frames, where light emitting elements are arranged between these frames, and a sealing member with a convex-lens shape is used to mix light from different regions, reducing color and luminance unevenness by ensuring even light distribution and wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged in specific regions to emit light of different colors, then illumination light of desired color can be obtained, but color unevenness and luminance unevenness occur in the emitted light
Solution Approach 1:
The device divides the light emitting area into multiple regions using first and second frames, with first light emitting elements in a first region and second light emitting elements in a second region. This segmentation allows different color lights to be emitted from different regions while maintaining overall color uniformity through the structured arrangement and optical mixing in the sealing member.
Solution Approach 2:
The sealing member acts as an intermediary optical element that receives light from both first and second light emitting elements, mixes the light from different regions, and outputs uniformly mixed illumination light. The convex-lens shape of the sealing member facilitates this optical mixing function, reducing color and luminance unevenness.
2Adaptability or versatility
If frames are used to demarcate light emitting regions, then light of different colors can be emitted from different regions, but the structure becomes more complex
Solution Approach 1:
The frames serve multiple functions: they demarcate different light emitting regions, provide structural support for mounting light emitting elements, and guide optical paths. The sealing member also performs multiple functions including protecting light emitting elements, mixing light from different regions, and shaping the output light distribution, reducing the need for additional separate components.
Solution Approach 2:
The first and second frames are integrated into a unified structure that collectively defines both the first and second light emitting regions. The sealing member combines the optical functions of light mixing and protection into a single component, simplifying the overall device architecture while maintaining color mixing capability.
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 reduces color and luminance unevenness by ensuring even light distribution and mixing of light from different regions, resulting in improved light quality and uniformity.
Implementation Method 1
a sealing member covering the at least one first light emitting element and the at least one second light emitting element... an upper surface of the sealing member in the first region is formed such that a portion closer to the first frame is lower than a portion closer to the second frame
Data Source
AI summary
A light emitting device includes a substrate; a first frame located on the substrate; a second frame located on the substrate, the second frame being located inward of and spaced apart from the first frame; at least one first light emitting element located on the substrate in a first region located between the first frame and the second frame; at least one second light emitting element located on the substrate in a second region located inward of the second frame; and a sealing member covering the at least one first light emitting element and the at least one second light emitting element. The second frame includes a light-transmissive portion. A highest portion of the second frame is higher than a highest portion of the first frame.