HUD Windshield Masking Strip With Light Deflection for Ghost Image Control
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Solution Overview
Problem
Head-up displays in vehicles suffer from unwanted secondary images due to reflections on the windshield, which can be distracting and require complex projector arrangements for sufficient brightness, leading to increased energy consumption and production challenges.
Innovation Solution
A vehicle pane with a masking strip and a light-deflecting device, such as a holographic element, integrated into the windshield to redirect projector light at a different angle, eliminating secondary reflections and allowing for smaller, more energy-efficient projector designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the projector power is increased to ensure sufficient image brightness, then the image brightness is improved, but the device size and energy consumption increase
Solution Approach 1:
The patent converts the harmful secondary reflection into a beneficial effect by using a light-deflecting device to redirect it. The deflecting device transforms the unwanted reflected light that would create ghost images into useful light that contributes to the primary image, thereby improving brightness without increasing projector power or energy consumption
2Illumination intensity
If the projector power is increased to ensure sufficient image brightness, then the image brightness is improved, but the device size increases
Solution Approach 1:
The patent converts the harmful secondary reflection into a beneficial effect by using a light-deflecting device to redirect it. The deflecting device transforms the unwanted reflected light that would create ghost images into useful light that contributes to the primary image, thereby improving brightness without increasing projector power or energy consumption
Solution Approach 2:
The light-deflecting device acts as an intermediary element between the projector and the windshield. It mediates the light path by capturing the secondary reflection and redirecting it to supplement the primary image, allowing for a smaller projector while maintaining sufficient brightness
3Object-affected harmful factors
If reflecting surfaces are arranged at an angle to make primary and secondary images coincide, then the secondary image is reduced, but the arrangement complexity increases
Solution Approach 1:
The patent extracts the light-deflecting function from the overall windshield structure and implements it as a separate, integrated element. By placing the deflecting device on the interior surface, it specifically targets and redirects the secondary reflection without requiring complex angular arrangements of the entire windshield or multiple reflecting surfaces
Solution Approach 2:
The light-deflecting device acts as an intermediary element between the projector and the windshield. It mediates the light path by capturing the secondary reflection and redirecting it to supplement the primary image, allowing for a smaller projector while maintaining sufficient brightness
4Temperature
If conductive coatings are added to the windshield for thermal management, then thermal comfort is improved, but unwanted secondary reflections increase
Solution Approach 1:
The patent converts the harmful secondary reflection into a beneficial effect by using a light-deflecting device to redirect it. The deflecting device transforms the unwanted reflected light that would create ghost images into useful light that contributes to the primary image, thereby improving brightness without increasing projector power or energy consumption
Solution Approach 2:
The light-deflecting device serves multiple functions: it eliminates secondary reflections, improves image brightness, and can be integrated with thermally managing coatings. This multi-functional approach allows the windshield system to address both optical and thermal requirements simultaneously
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 clear, high-contrast image display with reduced energy consumption and simplified production, enabling greater flexibility in head-up display component arrangement within vehicles.
Implementation Method 1
the reflection of light rays on the reflecting surface of the vehicle pane satisfies the condition that the angle of incidence corresponds to the the angle of reflection
Data Source
AI summary
A vehicle pane for a head-up display having, in the installed state, an outer side facing external surroundings and an inner side facing a vehicle interior, includes at least one transparent pane, at least one first masking strip in an edge region of the pane, wherein the at least one first masking strip is arranged on or in a carrier film and, in particular, is printed on the carrier film or embedded in the carrier film, and the carrier film is bonded to the at least one transparent pane, and at least one light-deflecting device for deflecting light into the vehicle interior or at least one image display device for displaying image information, which is arranged in the region of the masking strip, on the vehicle-interior side of the masking strip.