Windshield HUD Reflection Layout for Wider Field of Vision
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Solution Overview
Problem
Conventional field-of-vision display devices for vehicles, such as head-up displays, have limited field of vision and are hindered by the installation space within the dashboard, restricting the spatial angles for displaying information and preventing contact-analog overlays beyond a certain angle, while also being susceptible to interfering reflections from ambient light.
Innovation Solution
A method utilizing an electrically actuatable planar pixel arrangement with a reflection-suppressing deflection arrangement, comprising flat reflection surfaces at an acute angle, which projects a virtual display image onto a windshield, allowing for a significantly expanded field of vision and suppression of interfering reflections, enabling contact-analog and 3D displays beyond the horizon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional projection optical unit is used in the dashboard, then the field-of-vision display device can generate and project display content, but the installation space is occupied in the vertical direction and the field of vision is limited
Solution Approach 1:
The patent transitions from a conventional vertical projection optical unit to a planar pixel arrangement that extends in horizontal and vertical directions. By using multiple reflection surfaces arranged in parallel, the system expands the field of vision horizontally while maintaining a compact vertical profile, effectively utilizing spatial dimensions differently to resolve the contradiction between field of vision area and installation volume.
Solution Approach 2:
The projection optical unit is segmented into multiple independent reflection surfaces (first, second, third reflection surfaces) that can be independently controlled. Each surface segment corresponds to specific display content regions, allowing the system to expand the overall field of vision by combining multiple segmented surfaces while keeping each individual component compact for dashboard installation.
2Area of stationary object
If the projection optical unit is enlarged to increase field of vision, then more spatial angles become displayable, but the device occupies more space in the vertical direction
Solution Approach 1:
Instead of increasing the vertical dimension of a single projection optical unit, the patent distributes the projection function across multiple reflection surfaces arranged in a planar configuration. The first, second, and third reflection surfaces are positioned at different heights but extend horizontally, thereby expanding spatial angle coverage in the horizontal dimension while maintaining a limited vertical footprint suitable for dashboard integration.
Solution Approach 2:
The projection system is divided into multiple reflection surface segments, each responsible for specific angular ranges. This segmentation allows the system to achieve broad spatial angle coverage through the combined effect of multiple compact surfaces rather than requiring one large vertical surface, thus increasing spatial angle coverage without proportionally increasing vertical dimension.
3Illumination intensity
If ambient light reflects on the projection components, then the display visibility is reduced, but adding reflection suppression increases device complexity
Solution Approach 1:
Reflection suppression is applied locally to specific surfaces rather than requiring a complex system-wide solution. The first reflection surface is made light-absorbing on its rear side to suppress reflections from ambient light. The second and third reflection surfaces are positioned and oriented to geometrically minimize reflection paths toward the driver. This localized approach to reflection suppression maintains display visibility while avoiding the need for complex comprehensive reflection suppression systems.
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 a flatter and more space-efficient display system that can project virtual images at arbitrary distances, enhancing safety and comfort by allowing for a larger field of view and real 3D effects, while minimizing distracting reflections, thus improving user experience and usability in various driving situations.
Implementation Method 1
a reflection-suppressing deflection arrangement arranged on the planar pixel arrangement, which comprises one or more flat reflection surface(s) extending along the planar pixel arrangement at a predetermined acute angle in relation thereto and in parallel to one another for projecting the generated projection light beam on a partially transparent reflective projection pane
Implementation Method 2
The rear side(s) of the reflection surface(s) is/are made light-absorbing for interfering reflection suppression
Data Source
AI summary
A method for operating a field-of-vision display device for a motor vehicle, including an electrically controllable planar pixel assembly for generating a projection light beam having a display content and a reflection-suppressing deflection assembly, which is arranged on the planar pixel assembly and includes one or more flat reflection surfaces, extending along the planar pixel assembly at a predefined acute angle thereto and parallel to one another, for projecting the generated projection light beam onto a partially transparent, reflective projection pane, including a windshield of the motor vehicle, as a result of which a virtual display image shown in a field of vision of a user is generated behind the projection pane, wherein: the one or more reflection surfaces are each light-absorbing on the rear side thereof in order to suppress interfering reflection; at least one driving situation parameter is provided, in dependence on which different area segments of the planar pixel assembly are used to generate a desired display content.