Offset Mirror Head-Up Display Layout for Stray Light Control
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Solution Overview
Problem
Existing head-up displays face challenges in reducing size while maintaining image quality and preventing stray light and aberrations, particularly due to the complexity of their optical path systems.
Innovation Solution
A head-up display design that utilizes a single reflecting member to guide light from the display to the windshield, with the display surface tilted downward and its center positioned below the center of gravity of the reflecting surface, thereby reducing size and suppressing stray light and aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional head-up display with multiple reflecting members is used, then the optical path can be established, but the device size becomes large and complexity increases
Solution Approach 1:
The patent combines multiple reflecting members into a single integrated reflecting member with multiple reflecting surfaces. This merging reduces the number of separate components and simplifies the overall optical path while maintaining the necessary light reflection functions, directly addressing the contradiction between device size and complexity
Solution Approach 2:
The single reflecting member is segmented into multiple distinct reflecting surfaces, each serving specific optical functions. This segmentation allows complex optical paths to be achieved within a compact structure, resolving the contradiction by distributing functions across multiple surfaces rather than requiring multiple separate components
2Length of moving object
If the display surface is positioned higher, then the optical path is shorter, but stray light and aberrations increase
Solution Approach 1:
The patent positions the display surface center offset from the reflecting member center along the optical axis, creating an asymmetric configuration. This asymmetric positioning optimizes the optical path to reduce stray light and aberrations while maintaining a compact overall length, resolving the contradiction between optical path length and image quality
3Device complexity
If the display surface is tilted upward, then the optical path is simplified, but stray light increases
Solution Approach 1:
Instead of tilting the display surface upward as in conventional designs, the patent tilts it downward relative to the reflecting member. This inverted configuration simplifies the optical path while effectively blocking stray light from entering the observer's eye, resolving the contradiction between optical simplicity and stray light control
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 design allows for a compact head-up display with improved image quality by equalizing optical path lengths and reducing aberrations, while also minimizing stray light and maintaining a wide eye box.
Implementation Method 1
the image is seen as a virtual image by an observer through a display medium by the light emitted from the display surface of the display toward the reflecting member being reflected only by a reflecting surface of the reflecting member toward the display medium, and further being reflected by the display medium toward the observer
Data Source
AI summary
A head-up display includes: a display that emits light showing an image from a display surface; and a mirror, wherein the image is seen as a virtual image by an observer through a windshield by the light emitted from the display surface of the display toward the mirror being reflected only by a reflecting surface of the mirror toward the windshield, and further being reflected by the windshield toward the observer, and the display surface of the display is directed downward from a direction toward the mirror from the display, and a center of the display surface of the display is located below a the center of gravity of the reflecting surface of the mirror.