Laminated HUD Windshield with Wedge Interlayer for Ghost Image Reduction
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Solution Overview
Problem
Head-up displays in vehicles suffer from ghost images due to reflections on both surfaces of the windshield, which are not effectively addressed by existing laminated panes, and the masking region requires a different reflection structure than the HUD region.
Innovation Solution
A laminated pane with a wedge-shaped thermoplastic intermediate layer and a reflective layer covered by a masking layer, where the reflective layer is positioned outside the HUD region and covered by the masking layer, ensuring homogeneous reflection in both regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the reflective layer is positioned outside the HUD region and covered by the masking layer, then the aesthetic appearance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functions into a single integrated layer structure. The masking layer serves dual purposes: it provides the necessary UV protection and aesthetic appearance by covering the reflective layer, while simultaneously allowing homogeneous reflection in the masking region through its specific surface structure. This merging reduces the need for separate components.
Solution Approach 2:
The masking layer is designed with multi-functionality: it provides aesthetic coverage by hiding the reflective layer from external view, maintains UV protection functionality, and enables homogeneous reflection in the masking region. This universal design reduces overall system complexity despite the sophisticated layer arrangement.
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 laminated pane that effectively reduces ghost images and achieves homogeneous reflection in both HUD and masking regions, enhancing visual quality and aesthetic appeal.
Implementation Method 1
The thermoplastic intermediate layer is wedge-shaped at least in regions... The wedge angle can be constant over the entire film (linear thickness change) or change depending on the position (non-linear thickness change)
Implementation Method 2
The reflective layer is arranged on an interior-side surface of the inner pane facing away from the thermoplastic intermediate layer... ensuring homogeneous reflection in both regions
Data Source
AI summary
A laminated pane for a projection arrangement having an HUD region, includes an outer pane, a thermoplastic intermediate layer, and an inner pane, a masking layer, and a reflective layer, wherein the reflective layer is arranged on an interior-side surface of the inner pane facing away from the thermoplastic intermediate layer and outside of an HUD region of the laminated pane, wherein the reflective layer is arranged completely within the masking layer in a plan view of the laminated pane as seen from the inner pane, wherein the thermoplastic intermediate layer is wedge-shaped at least in the HUD region.