Phosphor-Infused Glazing for Head-Up Display Luminance
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Solution Overview
Problem
Head-up display systems using phosphors in glazing materials suffer from low luminance, especially under strong external luminosity, and require phosphors with high quantum efficiency, durability, and chemical compatibility, while maintaining transparency and neutral coloring.
Innovation Solution
Incorporating specific phosphor materials with a benzene ring substituted by ester groups and hydroxyl groups into the glazing interlayer, such as dialkyl 2-5 dihydroxyterephthalate, which are integrated into the thermoplastic material or deposited on the glass sheets, and excited by concentrated UV-visible radiation to enhance luminance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphors are incorporated into glazing materials for head-up display systems, then information visualization is enabled, but luminance is insufficient under strong external illumination
Solution Approach 1:
The patent changes the chemical parameters of the phosphor material by selecting specific compounds (strontium aluminate, calcium aluminate, barium aluminate) with particular crystal structures and activator elements (europium, manganese). These parameter changes result in phosphors with higher quantum efficiency and luminance output that can compete with strong external illumination during daytime
Solution Approach 2:
The patent uses composite phosphor materials consisting of aluminate base structures doped with rare earth elements (europium, manganese) as activators. These composite materials combine the host lattice stability with the luminescent properties of the dopants, achieving both high luminance and durability under UV exposure
2Illumination intensity
If phosphor concentration is increased to improve luminance, then brightness increases, but blur and color distortion increase
Solution Approach 1:
The patent optimizes the concentration parameters of phosphor particles in the glazing material to achieve a balance between luminance and image quality. By controlling particle size distribution and concentration levels, the system maintains sharp image edges while achieving sufficient brightness for daytime visibility
3Reliability
If conventional phosphors are used in glazing, then visualization is achieved, but durability under UV radiation is insufficient
Solution Approach 1:
The patent employs composite phosphor materials where aluminate host structures provide UV resistance and structural stability, while rare earth dopants provide luminescent functionality. This composite approach ensures durability under prolonged UV exposure while maintaining luminance performance
Solution Approach 2:
The patent selects phosphor materials with inherent UV stability that do not require additional protective layers or coatings, effectively making the phosphor itself UV-resistant and eliminating the need for separate protective components
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 achieves higher luminance and improved durability of the phosphor materials, ensuring better visualization of information under strong illumination conditions while maintaining transparency and chemical compatibility, thus enhancing the performance of head-up display systems.
Implementation Method 1
Under this incident radiation, phosphors re-emit radiation in the visible spectrum. This is called 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, in particular a windscreen for a motor vehicle or a glass panel for a building, such as a shop window, 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, glass panel in which at least one luminophore material is included to make said displaying possible, one of said luminophores including a benzene ring at least substituted by: a first ester group -COOR, wherein R is a straight or branched carbon group including a main carbon chain of at least six consecutive carbon atoms, said group R including, if the chain is straight, more than 10 carbon atoms in total and, if said chain is branched, at least 7 carbon atoms in total; preferably a second group -COOR', wherein R' is another hydrocarbon group or hydrogen, said second group being preferably in para position on the benzene ring relative to said first ester group; and two hydroxyl groups -OH, the two hydroxyl groups preferably being in para position on the benzene ring.