HUD Display Positioning for Windshield Double Image Suppression
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Solution Overview
Problem
Head-up display devices for vehicles often generate double images due to manufacturing errors causing non-parallel surfaces in windshields, leading to deviations in reflected light paths and resulting in a distorted virtual image.
Innovation Solution
A display device comprising a concave mirror and a drive mechanism that adjusts the position of the display to ensure the image display light remains parallel when projected onto a transparent member, preventing double image formation by matching the optical paths of light beams reflected from the front and back surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display is positioned at a reference distance from the concave mirror to make light beams parallel, then double images are suppressed, but the system cannot accommodate manufacturing errors in transparent member parallelism
Solution Approach 1:
The display position is made adjustable rather than fixed, allowing the distance between the display and concave mirror to be dynamically changed. This enables the system to adapt to manufacturing variations in the transparent member by shifting the display position within a predetermined range, maintaining proper optical alignment despite surface parallelism errors.
Solution Approach 2:
The patent changes the positional parameter of the display relative to the concave mirror. By adjusting the display position within a predetermined range, the system compensates for manufacturing tolerances in the transparent member, ensuring that light beams reflected from both surfaces converge at the same location without requiring perfect parallelism.
2Device complexity
If the front and back surfaces of the transparent member are assumed parallel, then optical path matching is simplified, but manufacturing errors cause light beam deviation and double image generation
Solution Approach 1:
The system pre-establishes an adjustable mechanism that compensates for manufacturing errors before they affect image quality. By designing the display position to be adjustable within a predetermined range, the system proactively addresses potential parallelism issues without requiring complex real-time correction mechanisms.
3Device complexity
If the display position is fixed at the reference distance, then the optical system is simpler, but it cannot compensate for non-parallel surfaces causing image distortion
Solution Approach 1:
The display position is made dynamically adjustable rather than fixed, allowing the system to adapt to manufacturing variations. This simple positional adjustment mechanism enables compensation for surface parallelism errors without adding complex optical components or correction 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
Effectively eliminates double images by ensuring that the light beams reflected from non-parallel transparent surfaces are aligned, providing a clear and focused virtual image to the user without excessive eye strain.
Implementation Method 1
a concave mirror that reflects the image display light such that the image display light is projected onto a transparent member
Implementation Method 2
a distance from the concave mirror to the display is smaller than or equal to a reference distance at which the image display light traveling from the concave mirror to the transparent member becomes parallel light
Data Source
AI summary
A display device includes: a display that generates image display light; a concave mirror that reflects the image display light such that the image display light is projected onto a transparent member; and a drive mechanism that moves the display in a range in which a distance from the concave mirror to the display is smaller than or equal to a reference distance at which the image display light traveling from the concave mirror to the transparent member becomes parallel light.