Phosphor Segmentation with Filler for Headlamp Contrast
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Solution Overview
Problem
Existing motor vehicle headlight conversion means face limitations in thermal management and achievable resolution or contrast ratio due to multiple scattering of converting particles, leading to lateral spread of the illuminated point, and lack of intrinsic monitoring for safe laser use.
Innovation Solution
The introduction of depressions with an electrically conductive layer and a filler in the phosphor, along with a measuring device to monitor resistance, enhances mechanical stability and contrast by reducing segment size and preventing light crosstalk, while sealing micro-cracks and providing intrinsic functionality monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the phosphor is subdivided into individual conversion segments by recesses, then the lateral spread of the illuminated point is reduced and resolution is improved, but the mechanical strength and overall integrity of the phosphor are weakened
Solution Approach 1:
The phosphor is divided into multiple conversion segments by forming recesses between them, which reduces lateral light spread and improves resolution. The recesses are filled with filler material to maintain mechanical integrity while preserving the segmentation benefits.
Solution Approach 2:
The phosphor structure is created as a composite material system where the phosphor material is combined with a filler material in the recesses. This composite structure provides both the optical segmentation benefits and the mechanical strength needed to prevent breakage.
2Manufacturing precision
If the phosphor is subdivided into individual conversion segments, then the contrast ratio is improved, but microcracks and breakouts occur in the individual segments
Solution Approach 1:
The phosphor is segmented into distinct conversion segments separated by recesses, which improves contrast ratio by reducing optical crosstalk between segments. The recesses are filled with filler material to prevent microcracks and maintain structural reliability.
Solution Approach 2:
The filler material acts as an intermediary substance in the recesses between conversion segments. It provides mechanical support to prevent segment breakage and microcracks, while also serving as an optical barrier to maintain contrast ratio.
3Reliability
If conventional conversion agents are used, then thermal management is challenging and lateral dot spread occurs, but no intrinsic monitoring of functionality is provided
Solution Approach 1:
The filler material in the recesses serves multiple functions: it provides mechanical support to maintain segment integrity, acts as an optical barrier to improve contrast, and enables intrinsic functionality monitoring through conductivity measurements, eliminating the need for separate monitoring systems.
Solution Approach 2:
The conversion agent structure includes built-in monitoring capability through the filler material's electrical conductivity. The system monitors its own functionality by measuring resistance changes in the filler material, allowing self-detection of degradation or failure without external monitoring equipment.
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 increases the contrast capability and mechanical stability of the conversion medium, allowing for improved resolution and reduced lateral spread of the illuminated point, while ensuring safe and functional operation through intrinsic monitoring.
Implementation Method 1
the light source is configured to excite the conversion segments to emit light with a wavelength conversion
Implementation Method 2
the depressions have at least an electrically conductive layer in at least some areas, and the light module further has at least a measuring device which is set up to measure the resistance of the at least one electrically conductive layer
Data Source
Figure 1a~3
Figure 4
AI summary
Light module for a motor vehicle headlight, comprising a conversion agent (100) and a light source (200), the conversion agent (100) having a phosphor (120) arranged on a carrier layer (110), wherein the phosphor (120) has a plurality of conversion segments (125) formed by recesses (130) in the phosphor (120), wherein the light source (200) is configured to excite the conversion segments (125) to emit light with a wavelength conversion, wherein the recesses (130) are formed as a continuous structure and are filled with a filler (300).