Laminated Windshield Glass With Light-Blocking HUD Ghost Suppression
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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 quality of projected images.
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 reduce or block reflected light and enhance image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-transmitting laminated glass is used for the front windshield, then visibility is improved, but ghost images are generated due to light reflection causing image quality degradation
Solution Approach 1:
The patent converts the harmful reflection effect into a beneficial one by introducing a light-blocking region with specific reflectivity characteristics. This region reflects projection light rays at angles of 50° to 72° (greater than 4%) to form desired images while the surrounding light-blocking periphery reflects these same rays (greater than 8% reflectivity) to prevent ghost images from forming, thus converting the harmful reflection into a controlled imaging mechanism
Solution Approach 2:
The patent applies different optical properties to different regions of the laminated glass. The light-transmitting region maintains high transparency for normal visibility, while the light-blocking region and its periphery have specific reflectivity characteristics for projection display. This spatial differentiation of optical properties allows simultaneous achievement of visibility and ghost image suppression
2Object-affected harmful factors
If the light-blocking region is designed with high reflectivity to prevent ghosting, then image quality is improved, but visibility may be compromised
Solution Approach 1:
The patent carefully designs the light-blocking region to have specific geometric characteristics and reflectivity values that differentiate it from the light-transmitting region. The light-blocking region occupies a controlled area with reflectivity greater than 4% for projection angles, while the light-transmitting region maintains greater than 70% visible light transmittance. This localized optimization prevents ghosting without compromising overall visibility
Solution Approach 2:
The patent optimizes specific parameters including the reflectivity of the light-blocking region (greater than 4%, preferably greater than 8% for S-polarized light), the angle range of incident projection light (50° to 72°), and the geometric configuration of the light-blocking region relative to the light-transmitting region. These parameter optimizations ensure ghost image suppression while maintaining 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 glass effectively minimizes ghosting, improving the visibility and clarity of projected images by reducing reflections and enhancing display quality.
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
a light ray emitted by a projection light source of the HUD system will undergo reflection when passing through each of two surfaces of the laminated glass in contact with air. The reflection on each of the two surfaces causes deviation, resulting in two mutually interfering ghost images
Implementation Method 3
The light-blocking region has a visible light transmittance less than or equal to 5%
Implementation Method 4
the laminated glass further includes a dielectric film disposed in the first function display region, the dielectric film is on the third surface or the fourth surface. A proportion of P-polarized light in the projection light ray incident ranges from 60% to 100%, and the first function display region has the reflectivity for the projection light ray incident greater than or equal to 8%
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.