Vehicle Display Cover Geometry for Ghosting Suppression
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Solution Overview
Problem
Existing vehicle display devices face challenges in improving image quality while preventing ghosting, which is often exacerbated by external light reflections.
Innovation Solution
A vehicle display device design featuring a housing with a light-blocking wall, a curved transparent cover with a free-form inner surface for distortion correction, and a reflective mirror, where the light-blocking wall shields external light from reaching the eye point, and the angular difference between the inner and outer surfaces is optimized to block unwanted reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shape of the cover is designed based on the correction function to improve image quality, then image distortion is corrected, but ghosting due to external light may occur
Solution Approach 1:
The patent divides the cover into two distinct surfaces: an outer surface with a specific shape for blocking external light, and an inner free-form surface for correcting image distortion. This segmentation allows each surface to independently perform its function without interfering with the other, resolving the contradiction between image quality improvement and ghosting suppression
Solution Approach 2:
Different regions of the cover have different functional properties: the outer surface is designed with a specific curvature to block external light at certain angles, while the inner surface has a free-form shape optimized for distortion correction. This local differentiation of quality allows simultaneous achievement of both goals
2Object-affected harmful factors
If a light-blocking wall is added to shield external light, then ghosting is suppressed, but the number of components increases
Solution Approach 1:
The patent merges the light-blocking function with the cover structure itself by designing the outer surface of the cover to act as the light-blocking wall. This integration eliminates the need for a separate light-blocking component while maintaining the ghosting suppression function, thus reducing device complexity
Solution Approach 2:
The cover is designed to perform multiple functions simultaneously: it protects the internal components, corrects image distortion through its inner free-form surface, and blocks external light through its outer surface shape. This multi-functionality reduces the need for additional components
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 enhances image quality by reducing external light interference and correcting distortions, thereby improving visibility of the virtual image while suppressing ghosting effects.
Implementation Method 1
a mirror that is disposed inside the housing, faces the windshield via the opening, and reflects the display light toward the windshield
Implementation Method 2
the inner surface is a free-form surface formed to correct distortion or aberration of the image
Implementation Method 3
the light-blocking wall shields the outer surface from first external light
Data Source
AI summary
A vehicle display device includes a housing, an image display device, a mirror, and a transparent cover disposed in an opening of the housing, in which the cover has an outer surface and an inner surface and has a shape curved, a light-blocking wall shields the outer surface from first external light, the inner surface is a free-form surface formed to correct image distortion or aberration, an angular difference between the inner surface and the outer surface in the cross section is a value within a range in which second external light can be blocked by the light-blocking wall, and the second external light is external light reflected along an optical path toward an eye point in a case where it is assumed that the external light is incident on the cover and reflected by the inner surface, in external light transmitted through a windshield toward the cover.