Vehicle Side Pane Projection With p-Polarized Ghost Image Suppression
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Solution Overview
Problem
Existing vehicle projection systems using window panes face issues with ghost images due to double reflections, which are typically mitigated by using wedge-like intermediate layers or p-polarized radiation close to Brewster's angle, but these solutions complicate production and increase costs.
Innovation Solution
A projection assembly for vehicles that uses a vehicle side pane with a reflective coating suitable for reflecting p-polarized radiation, eliminating the need for wedge-like intermediate layers and simplifying production by avoiding complex coatings required for windshields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If s-polarized radiation is used for projection, then the projection image can be generated, but ghost images appear due to double reflections on both external surfaces of the windshield
Solution Approach 1:
The patent changes the polarization parameter of the projection radiation from s-polarized to p-polarized. This parameter change exploits Brewster's angle phenomenon where p-polarized radiation is not reflected by the air-glass transition surfaces at the optimal angle, thereby eliminating ghost images while maintaining projection image generation.
Solution Approach 2:
The patent applies a reflective coating specifically on the interior-side surface of the vehicle pane. This localized coating creates a dedicated reflection surface that generates the projection image without causing double reflections, thus eliminating ghost images while maintaining projection functionality.
2Object-generated harmful factors
If wedge-like intermediate layers are used to mitigate ghost images, then ghost image problem is reduced, but production complexity and costs increase
Solution Approach 1:
The patent extracts the ghost image problem solution from the complex wedge-like intermediate layer approach and replaces it with a simple reflective coating on the interior surface. This extraction maintains the ghost image elimination functionality while dramatically simplifying the production process.
Solution Approach 2:
The patent replaces the expensive and complex wedge-like intermediate layer with a simpler, more economical reflective coating that can be applied directly to the interior surface of the vehicle pane, reducing production costs and complexity.
3Illumination intensity
If complex thin-film stacks are used for windshields to ensure high transmittance, then transparency requirements are met, but manufacturing complexity and costs increase
Solution Approach 1:
The patent applies coating only on the interior-side surface of the vehicle pane rather than requiring complex multi-layer coatings on both surfaces. This localized approach reduces coating complexity while maintaining the necessary optical properties for projection and visibility.
Solution Approach 2:
The patent uses a simpler reflective coating on the interior surface instead of complex thin-film stacks required for windshield transparency. This reduces manufacturing complexity and costs while meeting the specific requirements for side pane projection applications.
4Object-generated harmful factors
If p-polarized radiation close to Brewster's angle is used, then ghost images are avoided, but production complexity increases due to precise angle requirements
Solution Approach 1:
The patent introduces a reflective coating on the interior surface as an intermediary element. This coating serves as a dedicated reflection surface that generates the projection image without relying on precise angle control of the air-glass transition surfaces, thereby eliminating ghost images while simplifying production.
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 a cost-effective and economically producible projection assembly that generates a high-intensity projection image without ghost images, offering an extraordinary entertainment experience for rear vehicle occupants.
Implementation Method 1
The reflective coating is designed to reflect the p-polarized radiation in order to generate the projection image
Implementation Method 2
p-polarized radiation that is not substantially reflected by the surfaces of the side pane if the angle of incidence is selected close to Brewster angle for an air-glass transition
Data Source
AI summary
A projection assembly for a vehicle, includes a vehicle side pane, which is equipped with a reflective coating, and a projector, which is directed at a region of the vehicle side pane, wherein the radiation of the projector is predominately p-polarized and wherein the reflective coating is suitable for reflecting p-polarized radiation. The projection assembly is provided for displaying entertainment content such as films for the rear vehicle occupants.