HUD Fluorescent Glazing Reflection Control
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Solution Overview
Problem
Head-up display systems using fluorescent materials in laminated glazing suffer from excessive luminance issues when exposed to conventional UV or IR excitation sources, leading to safety concerns due to high reflection of laser radiation, which can cause eye injury and burning for vehicle occupants.
Innovation Solution
A method is developed to minimize radiation reflection by adjusting parameters such as beam polarization, angular width, and windscreen curvature and inclination, allowing optimal positioning of the source to reduce reflection, using a UV or IR laser source directed at fluorescent materials integrated into the glazing, which re-emit visible light for image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a concentrated laser beam is used to excite fluorescent materials in the glazing, then sufficient luminance is achieved for visibility under high insolation, but the reflection of incident radiation becomes dangerous causing eye injury and burning risks
Solution Approach 1:
The patent applies parameter changes by adjusting the polarization state of the incident laser beam and modifying the angular width of the beam. By changing these parameters, the system achieves sufficient luminance for visibility while controlling the reflection characteristics to prevent eye injury and burning risks to passengers.
Solution Approach 2:
The patent implements dynamics by making the angular width of the laser beam adjustable rather than fixed. This allows the system to adapt the beam characteristics to optimize both luminance output and reflection control depending on operating conditions, resolving the contradiction between visibility and safety.
2Object-affected harmful factors
If the angular width of the laser beam is increased to reduce reflection, then passenger safety is improved, but the concentration of energy on the fluorescent material decreases, reducing luminance
Solution Approach 1:
The patent resolves this contradiction by simultaneously adjusting multiple parameters: increasing the angular width to reduce reflection while compensating with polarization optimization to maintain sufficient energy concentration on the fluorescent material for adequate luminance output.
3Illumination intensity
If the laser beam is highly concentrated to achieve sufficient luminance under high insolation, then image visibility is improved, but the reflection intensity increases causing safety hazards
Solution Approach 1:
The patent changes the polarization parameter of the laser beam to achieve a favorable balance between luminance and reflection intensity. By optimizing polarization state, the system maintains high energy transfer to the fluorescent material for sufficient luminance while reducing the harmful reflection intensity directed toward passengers.
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 approach effectively reduces the reflection of incident radiation on the windscreen, enhancing passenger safety by minimizing the risk of eye injury while maintaining sufficient luminance for clear image visibility, even under high insolation conditions.
Implementation Method 1
a source emitting a beam of radiation of the visible UV or IR laser type or of the light-emitting diode type, directed towards a portion of said glazing comprising a fluorescent material absorbing said radiation and re-emitting light in the visible region
Implementation Method 2
from a first position i1 of the source in the passenger compartment, a polarized incident beam is emitted in such a way that its electromagnetic field is transverse magnetic
Data Source
AI summary
Method of using a device for displaying a real image of the head-up display (HUD) type in a passenger compartment comprising glazing, notably laminated glazing, said device comprising a source emitting a beam of radiation of the visible UV or IR laser type or of the light-emitting diode type, directed towards a portion of said glazing comprising a fluorescent material absorbing said radiation and re-emitting light in the visible region, the illumination of said portion by the beam enabling a real image to be displayed on the glazing.