Concave Mirror Display Positioning to Suppress Windshield Double Images
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Solution Overview
Problem
Existing display devices generate double images due to manufacturing errors causing non-parallel surfaces in transparent members like vehicle windshields, which existing technologies fail to adequately address.
Innovation Solution
A display device with a concave mirror and a drive mechanism that adjusts the position of the display to ensure image display light remains parallel, preventing double images by controlling the distance between the display and the concave mirror.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the front surface and back surface of the transparent member are assumed to be parallel, then the optical path matching is simplified, but manufacturing errors cause non-parallel surfaces leading to double image generation
Solution Approach 1:
The patent makes the transparent member adjustable in position and angle relative to the optical path. By dynamically adjusting the transparent member's position, the system compensates for manufacturing errors and non-parallelism, allowing optimal alignment to be achieved despite initial imperfections in the transparent member's surface parallelism
Solution Approach 2:
The patent changes the positional parameters of the transparent member (distance from concave mirror, angular orientation) to optimize the optical path. By adjusting these parameters, the system compensates for manufacturing errors and achieves proper optical alignment even when the transparent member surfaces are not perfectly parallel
2Device complexity
If the display is positioned at a fixed reference distance, then the optical path is simplified, but adjustment is needed to compensate for manufacturing errors and maintain image quality
Solution Approach 1:
The patent makes both the display and transparent member adjustable in position. The display can move along the optical axis to change distance from the concave mirror, and the transparent member can also be positioned and angled adjustably. This dynamic positioning capability allows the system to adapt to manufacturing errors and optimize image quality
Solution Approach 2:
The patent designs the system with multiple adjustable components (display position, transparent member position, transparent member angle) that can be independently adjusted. This multi-functional adjustment capability allows a single system to handle various manufacturing tolerances and optimize performance across different installation conditions
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 solution effectively suppresses double image generation and maintains a clear, focusable virtual image, reducing eye strain by ensuring the image distance is finite or infinite as needed.
Implementation Method 1
a concave mirror that reflects the image display light such that the image display light is projected onto a transparent member
Data Source
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AI summary
A display device 10 includes: a display 14 that generates image display light; a concave mirror 16 that reflects the image display light such that the image display light is projected onto a transparent member 30; and a drive mechanism 18 that moves the display 14 in a range in which a distance from the concave mirror 16 to the display 14 is smaller than or equal to a reference distance at which the image display light traveling from the concave mirror 16 to the transparent member 30 becomes parallel light.