Laminated Windshield Reflective Foil for Clearer Head-Up Displays
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Solution Overview
Problem
Head-up displays in automobiles face issues with reduced contrast and visibility due to undesired secondary images from external light interference, necessitating selective application of reflective coatings on windshields without masking complexities.
Innovation Solution
A laminated pane with a metal foil having a reflective surface, positioned within a masking layer region, ensuring high contrast and brightness by reflecting light emitted from an imaging unit, while avoiding external light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective layer is applied to increase the contrast in the reflection region, then the visual perception of safety-relevant information is improved, but the manufacturing complexity and cost increase due to selective coating requirements
Solution Approach 1:
The windshield is divided into different functional regions: a first region with a reflective layer for head-up display reflection, and a second region without the reflective layer for normal visibility. This segmentation allows selective application of the reflective coating only where needed, improving contrast in the reflection region while avoiding the complexity of masking entire surfaces.
Solution Approach 2:
The reflective layer is applied locally only to the first region of the windshield where head-up display reflection is required, rather than uniformly across the entire surface. This local quality approach ensures high contrast and visual perception in the reflection region while maintaining normal transparency in other areas, eliminating the need for complex masking procedures.
2Illumination intensity
If a reflective layer is applied to improve image brightness, then the visual perception is enhanced, but external light interference causes undesired secondary images
Solution Approach 1:
The reflective layer is applied selectively only to the first region where head-up display reflection is needed, with specific optical properties optimized for this purpose. The second region maintains different optical properties (no reflective layer) to allow normal light transmission without reflection, thereby preventing external light interference and undesired secondary images while enhancing brightness in the reflection region.
3Illumination intensity
If the background of the reflection region is made opaque to increase contrast, then the visual perception is improved, but the transparency of the windshield is reduced
Solution Approach 1:
The windshield is segmented into a first region with a reflective layer that provides the opaque background effect needed for high contrast, and a second region without the reflective layer that maintains full transparency. This segmentation allows the reflection region to have high contrast with an effectively opaque background while the rest of the windshield remains transparent for normal visibility.
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 laminated pane provides clear and bright virtual images even in varying light conditions, reducing energy consumption and preventing ghost images, with a manufacturing process adaptable to industrial production.
Implementation Method 1
a metal foil (6) having an outer-side surface (V) and an inner-side surface (VI) on which a reflective surface (7) for reflecting light is arranged
Implementation Method 2
a thermoplastic intermediate layer (3), wherein the thermoplastic intermediate layer (3) is arranged between the outer pane (1) and the inner pane (2)
Data Source
AI summary
A laminated pane includes at least an outer pane, a thermoplastic intermediate layer, an inner pane, at least one masking layer arranged in a region of the laminated pane, an adhesive layer, and a metal foil having an outer-side surface and an interior-side surface on which a reflective surface for reflecting light is arranged. The thermoplastic intermediate layer is arranged between the outer pane and the inner pane, the adhesive layer is arranged between the inner pane and the metal foil, and the metal foil is arranged in a region of the laminated pane which, when viewed perpendicularly through the laminated pane, lies completely within the region in which the masking layer is arranged.