HUD Optical Member Positioning for Mountability
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Solution Overview
Problem
Existing head-up display apparatuses face challenges in mountability due to interference with structural and functional components within the instrument panel, especially when using large-sized optical members, and are susceptible to adverse effects from concentrated sunlight.
Innovation Solution
The head-up display apparatus positions at least a part of the optical member outside the instrument panel, using aspherical mirrors that reflect specific wavelength bands to guide display light to the windshield, reducing interference and sunlight exposure, while allowing visual recognition of external sights through the optical member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If all optical members are accommodated inside the instrument panel, then the display structure is compact, but the optical members interfere with structural bodies and functional components inside the panel
Solution Approach 1:
The patent extends the optical path from the display device through the instrument panel into the dashboard space in front of the driver. By positioning the combiner and at least one optical member outside the instrument panel in the dashboard, the optical system utilizes the third dimension (depth into the dashboard) to resolve the spatial conflict between compactness and interference avoidance.
2Area of moving object
If large-sized optical members are used to achieve wider perspective display, then the field of view is improved, but the interference with internal components becomes more severe
Solution Approach 1:
The patent positions large-sized optical members (combiner and at least one additional optical member) in the dashboard space rather than confining them to the instrument panel. This dimensional relocation allows the optical members to achieve the necessary surface area for wide perspective display without interfering with components inside the panel.
Solution Approach 2:
The optical system is segmented into multiple components: a display device inside the instrument panel, a combiner positioned in the dashboard, and at least one additional optical member also in the dashboard. This segmentation allows each component to be optimally positioned to avoid interference while maintaining overall system functionality.
3Volume of moving object
If optical members are positioned inside the instrument panel, then the mounting space is efficient, but sunlight concentrates on the display device causing temperature increase
Solution Approach 1:
The patent extracts the combiner and at least one optical member from the instrument panel and positions them in the dashboard. This extraction removes the sunlight-focusing elements from the confined instrument panel space, preventing temperature increase of the display device while maintaining efficient overall space utilization.
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 improves mountability, reduces interference with internal components, enhances design quality by maintaining a wide field of view, and prevents adverse temperature effects from sunlight, thereby improving display efficiency.
Implementation Method 1
an optical member which reflects only light having the wavelength band
Data Source
AI summary
There is provided a head-up display apparatus including: a display device that is provided inside an instrument panel and projects display light, and an optical member that reflects the display light projected from the display device so as to guide the display light to a windshield. At least a part of the optical member is positioned outside the instrument panel.