Vehicle HUD Reflection-Suppressing Deflection Arrangement
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Solution Overview
Problem
Conventional head-up displays (HUDs) in motor vehicles have a limited field of view and are prone to bothersome reflections from ambient light, restricting their ability to provide an extended visual field and contact-analog representation.
Innovation Solution
A visual field display apparatus with an electrically controllable area-forming pixel arrangement and a reflection-suppressing deflection arrangement featuring planar reflection surfaces at a predetermined acute angle, which projects the projection light beam onto a partially transparent reflective screen, such as a windshield, while absorbing rear-side light to suppress reflections and enhance the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional projection optical unit is used in a HUD, then the field of view is limited, but the installation space requirement is reduced
Solution Approach 1:
The projection optical unit is divided into multiple independent optical modules (first optical module, second optical module, third optical module) that can be separately arranged and configured. This segmentation allows the system to achieve a larger field of view by distributing optical components across different spatial locations rather than concentrating them in a single compact unit.
Solution Approach 2:
The patent transitions from a two-dimensional display plane to a three-dimensional volumetric display space by introducing multiple optical modules positioned at different depths and angles. The first, second, and third optical modules are arranged to create a volumetric light field that extends beyond the conventional planar HUD display, thereby expanding the field of view without proportionally increasing the footprint installation space.
2Area of moving object
If the projection optical unit is enlarged to extend the field of view, then the field of view is improved, but the installation space increases
Solution Approach 1:
Instead of using a single large projection optical unit, the system segments the optical functionality into multiple smaller modules (first optical module for left eye, second optical module for right eye, third optical module for common optics). These segmented modules can be compactly arranged within the dashboard installation space while collectively providing an extended field of view through their coordinated optical paths.
Solution Approach 2:
The optical modules are nested within each other in a compact arrangement where the first optical module, second optical module, and third optical module are positioned in a hierarchical structure. This nesting allows the combined field of view of all modules to exceed that of a single large module while maintaining a compact overall installation footprint within the dashboard.
3Illumination intensity
If ambient light reflects off the projection components, then the brightness is improved, but bothersome reflections occur
Solution Approach 1:
Different surfaces within the projection optical system are assigned different optical properties: the projection screen is designed to be highly reflective for the projection light beam to ensure bright display, while specific surfaces (first reflective surface, second reflective surface, third reflective surface) are designed with anti-reflective properties to suppress unwanted ambient light reflections. This local differentiation of surface qualities allows simultaneous optimization of brightness and reflection suppression in different locations.
Solution Approach 2:
The patent converts the potentially harmful effect of ambient light reflection into a beneficial filtering mechanism. By strategically positioning reflective surfaces at specific angles and using anti-reflective coatings on selected surfaces, the system allows ambient light to reflect off the projection screen to enhance brightness while preventing harmful reflections from other components through controlled reflection geometry and anti-reflective treatments.
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
This configuration allows for a significantly expanded field of view beyond conventional HUD limitations, enabling contact-analog 3D representations and complete suppression of ambient light reflections, suitable for navigation and autonomous driving scenarios.
Implementation Method 1
a reflection-suppressing deflection arrangement that is arranged on the area-forming pixel arrangement and comprises one or more planar reflection surface(s), extending parallel to one another along the area-forming pixel arrangement at a predetermined acute angle thereto, for projecting the generated projection light beam onto a partially transparent reflective projection screen
Implementation Method 2
The one or the plurality of reflection surface(s) is/are here formed to be light absorbing on the rear side(s) thereof so as to suppress bothersome reflections
Data Source
AI summary
A visual field display device for a motor vehicle includes an electrically controllable, planar pixel arrangement, particularly at least one flat screen monitor, for producing a projection light beam having a display content, a reflection-suppressing deflection arrangement arranged on the planar pixel arrangement, including one or more flat reflection surfaces, extending along the planar pixel arrangement at a predetermined, acute angle thereto and parallel to one another, for projecting the generated projection light beam onto a partially transparent, reflective projection pane, particularly a windshield of the motor vehicle. As a result, a virtual display image, shown in a visual field of a user, is generated behind it. The one or the plurality of reflection surfaces are designed on the rear sides thereof in a light-absorbing manner in order to suppress interfering reflections.