Vehicle Head-Up Display Curved Windshield Parallax Reduction
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Solution Overview
Problem
Vehicle head-up display apparatuses face challenges in reducing distortion of virtual images on curved windshields when viewed by both eyes, leading to poor visibility and increased binocular parallax differences between left and right eyes, especially in areas with larger curvature radii.
Innovation Solution
A vehicle head-up display apparatus that projects images onto a translucent member in the instrument panel, reflecting them onto the windshield to create a virtual image with reduced binocular parallax, allowing for clear visibility by positioning character information in areas with minimal distortion and symbol information in areas with higher distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the magnification of the display image is increased to move the image forming position forward, then the display area is overlapped with the curved-surface area of the windshield glass, but the distortion of the display image caused by the curve of the windshield glass is increased
Solution Approach 1:
The patent divides the display area into multiple regions based on curvature characteristics of the windshield glass. Different regions are assigned different display parameters to compensate for distortion. The display area is segmented into a first display area with smaller curvature radius and a second display area with larger curvature radius, allowing independent optimization of each region.
Solution Approach 2:
The patent applies different display parameters to different regions of the display area according to their specific curvature characteristics. The first display area (with smaller curvature radius) and second display area (with larger curvature radius) use different parameters to achieve uniform image quality across the entire curved surface.
2Ease of operation
If the display image is projected onto a curved windshield glass, then the driver can visually recognize the display image without averting eyes, but distortion of the virtual image occurs
Solution Approach 1:
The patent pre-calculates and stores optimal display parameters for different regions of the curved windshield glass before actual operation. The curvature characteristics of each region are measured in advance, and corresponding display parameters are determined and stored in a storage unit, enabling real-time distortion compensation without complex calculations during driving.
Solution Approach 2:
The patent dynamically adjusts display parameters (such as magnification, position, and size) based on the curvature characteristics of different regions. By changing these parameters according to the specific geometric properties of each display area, the system compensates for distortion caused by the curved glass surface.
3Area of stationary object
If character information is displayed in an area with large curvature, then the display area increases, but the difference in distortion between virtual images seen by left and right eyes is increased
Solution Approach 1:
The patent dynamically determines the optimal display area for character information based on real-time assessment of binocular parallax and curvature characteristics. The system adjusts the display parameters and positioning of character information to maintain acceptable binocular compatibility while maximizing the usable display area on the curved windshield.
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 apparatus ensures high-quality display of character information with minimal binocular parallax and maintains visibility of symbol information despite increased distortion, enhancing overall display quality and reducing eye strain during driving.
Implementation Method 1
The apparatus is configured to project a display image displayed on the image displaying part toward the translucent member through an opening of the instrument panel, to reflect the projected display image on the translucent member, and to display character information and symbol information as a virtual image
Data Source
AI summary
To provide a head-up display apparatus capable of displaying an easily visible image. The apparatus projects a display image displayed on the image displaying part installed in an instrument panel of a vehicle toward a windshield glass (translucent member) through an opening of the instrument panel, reflects the image on the windshield glass, and displays character information and symbol information as a virtual image, which is visible from a predetermined eye-position range. The character information is displayed in a first area where a difference in distortion (binocular parallax) of the virtual image is less than a predetermine value when the translucent member is seen from the predetermined eye-position range.