Laminated Windshield Reflective Layer for High-Contrast Head-Up Displays
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Solution Overview
Problem
Head-up displays in vehicles face issues with reduced contrast and visibility due to undesired secondary images from external light interference, necessitating a solution that enhances contrast and brightness while allowing selective coating of specific windshield regions.
Innovation Solution
A laminated pane with a reflective layer applied to ultra-thin glass, positioned within the masking layer's region, using dielectric, silicon-based, or carbide layers for high reflectivity, combined with a masking layer to ensure high contrast and brightness, avoiding ghost images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective layer is applied to increase contrast in the reflection region, then visibility of virtual images is improved, but external light interference causes undesired secondary images
Solution Approach 1:
The patent applies a reflective layer selectively only in specific regions of the windshield where virtual images need to be displayed, rather than coating the entire surface. This localized approach enhances contrast and brightness in the projection area while allowing other regions to maintain normal light transmission, thereby reducing external light interference and preventing undesired secondary images.
Solution Approach 2:
The windshield is divided into different functional regions: a reflection region with applied reflective layer for displaying virtual images, and non-reflection regions without coating for normal visibility. This segmentation allows the system to optimize each region for its specific function, improving virtual image visibility while minimizing interference from external light.
2Illumination intensity
If selective coating of certain windshield regions is implemented, then contrast is enhanced, but manufacturing complexity increases due to masking requirements
Solution Approach 1:
The patent employs selective regional coating of the reflective layer on the windshield surface. By applying the coating only where needed for virtual image display rather than uniformly across the entire windshield, the solution enhances contrast in specific areas while simplifying the overall manufacturing process compared to full-surface coating with complex masking.
3Area of stationary object
If transparency of reflection region is increased to at least 70%, then external visibility is maintained, but contrast of virtual image is reduced due to light overlay
Solution Approach 1:
The patent creates different optical properties in different regions of the windshield. The reflection region with reflective layer has enhanced contrast for virtual images, while other regions maintain high transparency for external visibility. This local differentiation resolves the contradiction by allowing each region to optimize for its specific function.
Solution Approach 2:
The windshield is segmented into a reflection region with applied coating for virtual image display and non-reflection regions maintaining original transparency. This segmentation enables the system to simultaneously achieve good external visibility through transparent regions and high virtual image contrast through the coated reflection region.
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 enhanced visibility of virtual images by increasing contrast and brightness, reducing external light interference, and allowing easy manufacturing with selective coating, thus improving safety and efficiency.
Implementation Method 1
a reflective layer (7) for reflecting light is arranged on the outer-side surface (V) of the glass pane (6) and/or on the inner-side surface (VI) of the glass pane (6)
Implementation Method 2
By means of physical vapor deposition, the glass pane is coated with the atoms released from the target in an evacuated chamber
Data Source
AI summary
A laminated pane includes an outer pane, a thermoplastic intermediate layer, an inner pane, a masking layer arranged in a region of the laminated pane, an adhesive layer, and a glass pane having an outer-side surface and an interior-side surface and a thickness of 20 μm to 500 μm. The thermoplastic intermediate layer is arranged between the outer and inner panes, the adhesive layer is arranged between the inner pane and the glass pane, at least one reflection layer for reflecting light is arranged on the outer-side surface of the glass pane and/or on the interior-side surface of the glass pane, and the glass pane is arranged in a region of the laminated pane which, when viewed perpendicularly through the laminated pane, lies entirely within the region in which the masking layer is arranged. The reflective layer contains of a dielectric layer, a silicon-based layer, or a carbide layer.