Glazing Phosphor Emission Wavelength for HUD Luminance
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Solution Overview
Problem
Current head-up display systems using phosphors in glazing materials suffer from low luminance, especially under strong external luminosity, and require phosphors with specific properties balancing high luminance, durability, and color neutrality, with existing solutions limited to blue emission wavelengths, which are not suitable for polychromatic visualization.
Innovation Solution
Development of glazing with phosphor compounds having luminescence centered between 550 and 650 nm for yellow-orange-red emission, incorporating benzene rings substituted with hydroxyl groups and unsaturated heterocycles, integrated into thermoplastic interlayers, to achieve high luminance and durability while maintaining transparency and chemical compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphors are integrated into glazing materials for head-up display systems, then visualization capability is provided, but luminance is insufficient under strong external luminosity
Solution Approach 1:
The patent changes the emission wavelength parameter of phosphors from blue (440 nm) to yellow-orange-red (550-650 nm) range. This parameter change increases luminance by a factor of 3-5 under strong external luminosity conditions while maintaining durability and color neutrality, directly resolving the luminance insufficiency problem.
Solution Approach 2:
The patent employs color change by selecting phosphors with emission maxima in the yellow-orange-red range (550-650 nm) instead of traditional blue phosphors. This color selection optimizes visibility under daytime conditions while maintaining color neutrality (yellow index < 15) and achieving sufficient luminance contrast against strong external light.
2Illumination intensity
If phosphor concentration is increased to improve luminance, then luminance increases, but color neutrality deteriorates
Solution Approach 1:
The patent optimizes the phosphor emission wavelength parameter to 550-650 nm (yellow-orange-red range) where the human eye has high sensitivity. This allows achieving sufficient luminance with lower phosphor concentrations, thereby maintaining color neutrality (yellow index < 15) while avoiding the color distortion that would result from higher concentrations of blue phosphors.
3Illumination intensity
If blue emission phosphors are used, then luminance is achieved, but polychromatic visualization capability is lost
Solution Approach 1:
The patent transitions from single-color blue phosphors to multi-color phosphors with emission maxima in the yellow-orange-red range (550-650 nm). This enables polychromatic visualization capability while maintaining high luminance under strong external luminosity, as the yellow-orange-red colors provide both visibility and color information.
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 provides sufficient luminescence intensity and durability, ensuring polychromatic visualization with minimal visible light absorption, enhancing the usability of head-up displays under various lighting conditions.
Implementation Method 1
The phosphors, under this incident radiation, re-emit radiation in the visible range. We speak of down conversion when the incident radiation is UV
Data Source
Figure 1
AI summary
The present invention relates to a glass panel for displaying information including an assembly of at least two transparent sheets of inorganic glass or of a plastic material, joined together by an insert made of a thermoplastic or adhesive material or by multilayer sheets including such an insert, at least one luminophore material being included to make said displaying possible, in which one of said luminophores includes a benzene ring at least substituted by: two hydroxyl groups OH; a carbon group R, said group R including an unsaturated heterocycle; a carbon group R' of formula -COOR'', wherein R'' is a hydrocarbon group or hydrogen.