Head-Up Display Mirror Layout for Virtual Image Tilt Control
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Solution Overview
Problem
Existing head-up display devices struggle to accurately adjust the tilt angle of a virtual image due to unclear influence of parameters other than the tilt angle, making it difficult to display the image at a desired angle.
Innovation Solution
A head-up display device that utilizes a specific index S, calculated using parameters Mh, Mv, Wh, Wv, Wi, and Ci, set to 90 or greater, to ensure the virtual image is displayed at a desired tilt angle parallel to the road surface, achieved through a configuration involving a light emission surface and a concave mirror.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tilted virtual image is displayed by tilting the display surface at a predetermined tilt angle, then the virtual image can be displayed with some tilt angle, but it is difficult to display the virtual image at a desired tilt angle because parameters other than tilt angle also affect the tilt angle adjustment
Solution Approach 1:
The patent applies parameter changes by establishing a comprehensive index S that incorporates multiple parameters (magnification Mh and Mv, curvature radii Wh and Wv, incident angles Wi and Ci, and angle Dv) rather than relying solely on the tilt angle of the display surface. By changing and optimizing these multiple parameters simultaneously according to the formula S=10.7×Mh+(−8.32)×Mv+(−0.0187)×Wh+(−0.000995)×Wv+0.345×Wi+(−3.52)×Ci+3.90×Dv, the system achieves precise control over the virtual image tilt angle, resolving the contradiction between manufacturing precision and ease of operation.
2Measurement precision
If the display surface is tilted at a predetermined tilt angle, then the virtual image can be displayed with a tilt angle, but the tilt angle cannot be accurately adjusted to the desired value due to unclear influence of other parameters
Solution Approach 1:
The patent implements feedback by creating an index S that quantifies the relationship between multiple parameters and the virtual image tilt angle. This index provides a feedback mechanism where the combined effect of magnification, curvature radii, incident angles, and display surface angle can be measured and adjusted systematically. The formula S=10.7×Mh+(−8.32)×Mv+(−0.0187)×Wh+(−0.000995)×Wv+0.345×Wi+(−3.52)×Ci+3.90×Dv serves as a feedback tool to achieve the desired tilt angle by indicating how each parameter contributes to the overall result.
Solution Approach 2:
The patent recovers lost information about parameter influence by explicitly defining the index S that captures the quantitative relationship between all relevant parameters and the tilt angle. This transforms the previously unclear parameter influences into measurable, adjustable variables with known weights in the index formula, enabling precise control and measurement of the virtual image tilt angle.
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 device effectively displays a virtual image at a desired tilt angle, ensuring it appears parallel to the road surface, thereby improving image alignment and visibility for the viewer.
Implementation Method 1
a concave mirror that reflects the display light toward the windshield
Data Source
AI summary
A head-up display device includes: a light emission surface that displays an image and emits display light corresponding to the displayed image; and a concave mirror that reflects the display light toward the windshield, and has an index S, represented in expression S=10.7×Mh+(−8.32)×Mv+(−0.0187)×Wh+(−0.000995)×Wv+0.345×Wi+(−3.52)×Ci+3.90×Dv, which is set to 90 or greater, where Mh and Mv respectively are magnifications in the horizontal and vertical directions of the virtual image with respect to the image in the optical axis position, Wh and Wv respectively are curvature radiuses in the horizontal and vertical direction of the position in which the optical axis reaches in the windshield, Wi is an incident angle of the optical axis into the windshield, Ci is an incident angle of the optical axis into the concave mirror, and Dv is an angle formed between a normal line of the light emission surface and the optical axis of the display light.