Layered Light-Emitting Structure for Uniform White Color Mixing
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Solution Overview
Problem
Existing light emitting devices using multiple light emitting elements of different peak wavelengths struggle to achieve uniform color mixing, leading to inconsistent color emission.
Innovation Solution
A light emitting device is designed with a layered structure comprising light emitting elements of different peak wavelengths, a light-transmissive member, and wavelength converting members, where the elements are aligned orthogonally and covered by a light-transmissive member to enhance light extraction efficiency and color mixing, utilizing fluorescent material particles to convert blue light into red light, resulting in white light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting elements of different peak wavelengths are used, then color variety is improved, but color mixing uniformity deteriorates
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacked configuration of light emitting elements. Multiple elements are arranged vertically in layers rather than horizontally, allowing light to propagate through multiple interfaces and paths, which enhances color mixing uniformity while maintaining diverse wavelength coverage.
Solution Approach 2:
The patent implements a nested structure where wavelength converting members are positioned between and around light emitting elements in a stacked configuration. Each wavelength converting member is nested within the optical path of specific light emitting elements, enabling sequential wavelength conversion and improved color mixing as light passes through multiple nested layers.
2Manufacturing precision
If light emitting elements are arranged in a stacked configuration, then color mixing is improved, but device complexity increases
Solution Approach 1:
The patent designs the stacked structure where each layer serves multiple functions: light emitting elements provide both primary light emission and act as wavelength converters for underlying elements, while wavelength converting members simultaneously convert specific wavelengths and serve as structural spacers. This multi-functionality reduces overall device complexity despite the stacked configuration.
Solution Approach 2:
The patent merges the functions of light emission and wavelength conversion into a single integrated stacked structure. Rather than separate modules, light emitting elements and wavelength converting members are combined in alternating layers, with each component serving dual purposes in the overall optical system, thereby simplifying the device architecture.
3Manufacturing precision
If wavelength converting members are used to convert blue light to red light, then color accuracy is improved, but light extraction efficiency may deteriorate
Solution Approach 1:
The patent positions wavelength converting members selectively between specific light emitting elements based on their emission characteristics. Each wavelength converting member is placed only where its specific wavelength conversion function is needed, allowing optimized light extraction paths for different wavelength regions while maintaining color accuracy through targeted wavelength conversion.
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 device achieves improved color reproductivity and uniform color mixing by efficiently combining blue, green, and red light, enhancing optical utilization efficiency and reducing color unevenness.
Implementation Method 1
utilizing fluorescent material particles to convert blue light into red light
Data Source
AI summary
A light emitting device includes: a mounting substrate comprising a mounting substrate first surface; a first light emitting element configured to emit light having a first peak wavelength; a second light emitting element configured to emit light having a second peak wavelength longer than the first peak wavelength; a first light-transmissive member; and a first wavelength converting member located on the first light-transmissive member.