Laminated Windshield Structure for HUD Ghost Image Reduction
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Solution Overview
Problem
The reflection of light rays on the surfaces of laminated glass used in automotive head-up displays causes ghost images due to interference, degrading the image quality projected onto the windshield.
Innovation Solution
A laminated glass design with a light-blocking region and functional display regions, including masking layers, dielectric films, and flexible display screens, to minimize reflections and enhance image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-blocking region is added to laminated glass, then ghost image interference is reduced, but device complexity increases
Solution Approach 1:
The laminated glass is divided into distinct functional regions: a light-transmitting region for normal visibility and a light-blocking region for reducing ghost image interference. This segmentation allows different parts of the glass to perform different functions, effectively reducing ghosting while maintaining overall system feasibility
Solution Approach 2:
The light-blocking region is strategically positioned in specific areas of the laminated glass where ghost images appear, rather than blocking the entire glass surface. This localized approach reduces ghost image interference in critical areas while preserving light transmission and visibility in other regions
2Object-affected harmful factors
If light-blocking region with low transmittance is used, then ghosting is reduced, but visibility in light-transmitting region may be affected
Solution Approach 1:
The glass surface is segmented into light-transmitting regions with high transmittance for visibility and light-blocking regions with low transmittance for ghosting reduction. By spatially separating these conflicting requirements, both visibility and ghosting reduction are achieved simultaneously
Solution Approach 2:
Different transmittance properties are assigned to different regions of the laminated glass. The light-transmitting regions maintain high visibility while the light-blocking regions specifically target ghost image areas, allowing each region to optimize its local function
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 glass effectively reduces ghosting and enhances the quality of projected images by minimizing reflections, improving visibility and contrast.
Implementation Method 1
The adhesive film is disposed between the second surface and the third surface and configured to adhere the first transparent substrate and the second transparent substrate
Implementation Method 2
The light-blocking region has a visible light transmittance less than or equal to 5%. The light-blocking region has a first region located below the light-transmitting region, and the first region has one or more first function display regions for displaying of a first image
Implementation Method 3
The first function display region is configured to receive a projection light ray for forming the first image that is incident at an angle of 50° to 72°. The first function display region has a reflectivity for the projection light ray incident greater than or equal to 4%
Data Source
AI summary
The disclosure relates to a laminated glass and a head-up display system. The laminated glass includes a first transparent substrate, a second transparent substrate, and an adhesive film. The laminated glass has a light-transmitting region and a light-blocking region surrounding at least part of a periphery of the light-transmitting region. The adhesive film is disposed between the first transparent substrate and the first transparent substrate and configured to adhere the first transparent substrate and the second transparent substrate. The light-transmitting region has a visible light transmittance greater than or equal to 70%. The light-blocking region has a visible light transmittance less than or equal to 5%. The light-blocking region has a first region located below the light-transmitting region, and the first region has one or more first function display regions for displaying of image.