Automotive Display Concave Mirror Attitude Control
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Solution Overview
Problem
The vehicular vision system described in existing patents experiences distortion in the projected image due to the positional relationship between the projector and screen, leading to inaccuracies in the optical path lengths and magnification differences, affecting the observer's view.
Innovation Solution
A display system for automobiles that includes a concave mirror with a freely changeable attitude, an emitter with a display surface, and an intermediate reflective member, where the light emitted is directly or indirectly incident on the concave mirror, reducing optical path differences and distortion by ensuring the tangent line of the concave mirror is parallel to the display surface's width direction, and using an angle sensor to adjust the emitter's orientation for optimal image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a projector and screen are used to display rear images in a vehicular vision system, then the rear image can be projected onto the screen, but distortion occurs in the projected image due to positional relationship between the projector and screen
Solution Approach 1:
The patent employs a concave mirror with a curved reflective surface to reflect and redirect light from the display surface. The curvature of the concave mirror helps to correct optical path differences and reduce image distortion by focusing and redistributing light rays uniformly across the observer's field of view, thereby improving image accuracy without requiring extreme manufacturing precision in the optical path.
Solution Approach 2:
The patent introduces a concave mirror as an intermediary optical element between the display surface and the observer's eye. This intermediary component redirects light paths and equalizes optical path differences, serving as a mediator that corrects distortion caused by the positional relationship between the projector and screen, thus improving measurement precision without worsening manufacturing precision requirements.
2Manufacturing precision
If the emitter and concave mirror are positioned to minimize optical path differences, then distortion is reduced, but the device complexity increases due to adjustable attitude mechanisms
Solution Approach 1:
The patent implements a concave mirror with freely changeable attitude, allowing dynamic adjustment of the mirror's orientation and position. This dynamic capability enables the system to adapt to different viewing conditions and optimize optical path uniformity for various observer positions, achieving reduced distortion while managing device complexity through controlled adjustability rather than fixed complex mechanisms.
Solution Approach 2:
The patent utilizes angle sensors to detect and measure the attitude of the concave mirror, enabling precise control and adjustment of the mirror's orientation parameters. By monitoring and adjusting these parameters (angles and positions), the system optimizes optical path uniformity and minimizes distortion without requiring overly complex mechanical structures, as the adjustments are based on measurable parameter changes.
3Manufacturing precision
If the tangent line of the concave mirror is made parallel to the display surface width direction, then magnification differences are minimized, but the constraint on mirror orientation reduces system flexibility
Solution Approach 1:
The patent employs a concave mirror with freely changeable attitude that can dynamically adjust its orientation. The system can set the tangent line parallel to the display surface width direction to minimize magnification differences when needed, while retaining the flexibility to change orientation for different viewing conditions. This dynamic adaptability resolves the contradiction by making the orientation constraint conditional rather than fixed.
Solution Approach 2:
The patent uses angle sensors to monitor and control the attitude parameters of the concave mirror. By adjusting the mirror's orientation parameters (angles) based on detected positions and viewing conditions, the system can achieve the optimal configuration where the tangent line is parallel to the display surface width direction to minimize magnification differences, while still maintaining overall system flexibility through controlled parameter adjustments.
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 configuration reduces distortion in the observed image by minimizing optical path differences and magnification differences between the left and right sides, providing a clearer and more accurate view of the area behind the vehicle.
Implementation Method 1
a concave mirror having a final reflective surface that is concave and having an attitude that is freely changeable. The light emitted from the emitter is directly or indirectly incident on the final reflective surface, and the final reflective surface reflects the light which is incident toward an eye of an observer
Data Source
AI summary
A tangent line, described next, is, in top view, parallel to a straight line extending in a width direction of the display surface in a range in which the attitude can be changed. The tangent line is present on a plane orthogonal to the up-down direction of the automobile, and contacts a center of the final reflective surface. In top view, of an angle formed by a straight line connecting a center of the final reflective surface with a center of the display surface and the tangent line of the final reflective surface, a supplementary angle which is supplementary to an angle that is on a rear side of the automobile and that is on a side where the observer is present is an acute angle of less than 90 degrees.