Light Emitting Device Asymmetric Light Blocking Layers
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Solution Overview
Problem
Existing light emitting devices face challenges in suppressing cross talk and reducing the area of dark portions, which affect the uniformity of illumination patterns, particularly in vehicle headlight applications, due to the arrangement of LED elements and the use of fluorescent layers.
Innovation Solution
The implementation of light blocking layers within the fluorescent layer, positioned closer to the center of one LED element when viewed from adjacent elements, helps to suppress cross talk and reduce dark portions by reflecting light and maintaining a uniform illumination pattern without increasing the gap between LED elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light blocking objects are arranged between LED elements to suppress cross talk, then cross talk is reduced, but the gap between LED elements increases causing reduced luminance and larger dark portions
Solution Approach 1:
The light blocking layer is integrated into the fluorescent layer structure, transitioning from a separate spatial arrangement to a multi-layered vertical structure. This allows light blocking functionality to be achieved within the existing gap space by adding depth (Z-axis) rather than increasing horizontal separation.
Solution Approach 2:
The fluorescent layer is transformed into a composite structure containing both fluorescent material and light blocking material in distinct regions. This composite approach allows simultaneous wavelength conversion and light blocking functions within the same layer, eliminating the need for separate components.
2Object-affected harmful factors
If gap between LED elements is increased to arrange light blocking objects, then cross talk is suppressed, but dark portions between LED elements become more prominent
Solution Approach 1:
The solution moves the light blocking function from the horizontal plane to the vertical dimension by integrating it into the fluorescent layer thickness. This allows effective light blocking without increasing the horizontal gap, thereby preventing expansion of dark portion areas.
Solution Approach 2:
The fluorescent layer is designed with spatially varying properties: regions closer to LED element centers contain light blocking material while regions closer to gap centers maintain fluorescent material. This local differentiation allows selective light blocking without uniformly increasing gaps.
3Object-affected harmful factors
If multiple light blocking layers are disposed asymmetrically in the fluorescent layer, then cross talk is effectively suppressed, but manufacturing complexity increases
Solution Approach 1:
The fluorescent layer is segmented into multiple sub-layers or regions with different light blocking properties. This segmentation allows asymmetric arrangement of light blocking material to target specific cross talk paths while maintaining manufacturability through standardized layering processes.
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 solution effectively reduces the occurrence of cross talk and dark portions, enhancing the accuracy of light emitting patterns and maintaining high luminance, thus improving the overall performance of light emitting devices in illumination applications.
Implementation Method 1
light blocking layers 34...reflecting light
Implementation Method 2
fluorescent layer 55 includes, for example, fluorescent particles that emit yellow light. The blue light that is emitted by the LED elements 54 and that is incident on the fluorescent particles of the fluorescent layer 55 is converted into yellow light by wavelength conversion.
Data Source
AI summary
Provided is a light emitting device that includes a plurality of light-emitting elements, a fluorescent layer that is disposed on or above the plurality of light-emitting elements, and light blocking layers that are disposed in the fluorescent layer, two of the light blocking layers being disposed, when an adjacent two of the plurality of light-emitting elements are seen, at positions each of which is closer than the center of a region between the two light-emitting elements to the center of one of the two light-emitting elements while the center of the region between the two light-emitting elements functions as a reference.