HUD Window Nano Coating for Ghost-Free Thermal Insulation
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Solution Overview
Problem
Current head-up display (HUD) technologies in automobiles rely on expensive, high-tech polyvinyl butyral (PVB) coatings that are not cost-effective and have poor thermal insulation, requiring different coatings for various vehicle models and failing to meet thermal comfort requirements.
Innovation Solution
A HUD window system featuring a window glass with a transparent nano coating that reflects P-polarized light, providing high visible light transmittance and effective thermal insulation, while incorporating an electric heating function for defrosting and defogging, using a laminated glass structure with dielectric and conductive layers for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wedge-shaped PVB coating is used to achieve HUD image without ghosting, then the ghosting effect is eliminated, but the material cost increases 7 to 10 times and technological difficulty is significantly high
Solution Approach 1:
The patent changes the polarization parameter of the projection light ray to be greater than or equal to 70% P-polarized light, which fundamentally alters how the light interacts with the glass surface. This parameter change enables the use of ordinary PVB coating instead of expensive wedge-shaped coatings, as the polarized light naturally achieves the desired reflection characteristics without requiring complex coating geometries
Solution Approach 2:
The patent replaces expensive, difficult-to-manufacture wedge-shaped PVB coatings with ordinary, readily available PVB coating materials. By using common materials in combination with polarized light projection, the system achieves the same HUD image quality without ghosting while dramatically reducing material costs and manufacturing complexity
2Reliability
If different PVB coatings are specially designed for different vehicle models, then the HUD image quality is optimized for each model, but the applicability is poor and manufacturing complexity increases
Solution Approach 1:
The patent creates a universal solution that works across different vehicle models by using ordinary PVB coating combined with polarized light projection. The system is designed to be model-agnostic, allowing the same projection device and coating combination to be applied to various vehicle types without requiring custom-designed coatings for each model, thereby improving adaptability and reducing manufacturing complexity
3Ease of manufacture
If ordinary PVB coating is used instead of special wedge-shaped coating, then material cost is reduced, but the thermal insulation effect is poor and fails to meet thermal comfort requirements
Solution Approach 1:
The patent creates a composite system combining ordinary PVB coating with polarized light projection technology. The PVB coating provides the basic optical function of eliminating ghosting, while the polarized light projection adds the functionality of thermal management. This composite approach allows the use of inexpensive ordinary coating materials while achieving both optical quality and thermal insulation performance through the synergistic combination of materials and light technology
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 a HUD image without ghosting, ensures thermal comfort, and meets safety driving requirements with enhanced visibility and thermal insulation, while being aesthetically pleasing and cost-effective compared to existing solutions.
Implementation Method 1
The transparent nano coating is capable of reflecting at least part of the P-polarized light incident on the window glass. The window glass has a reflectivity for the P-polarized light greater than or equal to 5%.
Implementation Method 2
The window glass has a visible light transmittance greater than or equal to 70%.
Implementation Method 3
The window glass has a total solar energy transmittance less than or equal to 50%.
Implementation Method 4
The transparent nano coating includes at least five dielectric layers and at least four conductive layers. Each of the at least four conductive layers is sandwiched between two adjacent dielectric layers in the at least five dielectric layers.
Data Source
AI summary
A head-up display (HUD) window includes a window glass and a projector. The window glass includes a glass layer and a transparent nano coating. The transparent nano coating is disposed on the glass layer. The projector is configured to generate and project a projection light ray onto the window glass to form a projection image. A proportion of P-polarized light in the projection light ray is greater than or equal to 70%. The transparent nano coating is capable of reflecting at least part of the P-polarized light incident on the window glass. The window glass has a reflectivity for the P-polarized light greater than or equal to 5%. The window glass has a visible light transmittance greater than or equal to 70%. The window glass has a total solar energy transmittance less than or equal to 50%.