Vehicle Window Moth-Eye Structure for HUD Visibility
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Solution Overview
Problem
Conventional head-up displays in vehicles suffer from reduced visibility due to light reflection and propagation issues from the surrounding area of the image projection surface on the window reflector, particularly on the cabin-side surface, which are not effectively addressed by existing technologies.
Innovation Solution
A vehicle body structure with a moth-eye structure on the surrounding area of the image projection surface of the window, which suppresses light reflection and propagation from the surrounding area to the image projection area, improving visibility and reducing user discomfort by using a moth-eye film and image projection film configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a moth-eye structure is formed on the outermost surface of the reflector to suppress reflection, then reflection from the outermost surface is reduced, but reflection from the cabin-side surface (innermost surface) is not suppressed, resulting in double image and reduced visibility
Solution Approach 1:
The patent applies the local quality principle by forming a moth-eye structure only in the surrounding area that surrounds the image projection area on the cabin-side surface of the window. This localized application suppresses reflection from the surrounding area without affecting the image projection area, thereby preventing double image formation while maintaining image visibility. The selective positioning of the moth-eye structure in specific regions resolves the contradiction between reducing harmful reflection and maintaining reliable image display.
2Object-affected harmful factors
If the entire image projection surface is covered with a moth-eye structure to suppress reflection, then reflection is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing the window surface into distinct functional zones: an image projection area and a surrounding area. The moth-eye structure is formed only in the surrounding area, separating the reflection suppression function from the image projection function. This segmentation reduces manufacturing complexity compared to applying the moth-eye structure across the entire surface, while still achieving effective reflection suppression where needed.
3Device complexity
If light reflection from the surrounding area is not suppressed, then the structure remains simple, but light propagates from the surrounding area to the image projection area, reducing image visibility
Solution Approach 1:
The patent introduces the moth-eye structure as an intermediary element in the surrounding area between the external environment and the image projection area. This intermediary structure suppresses reflection and blocks light propagation from the surrounding area to the image projection area, thereby improving image visibility without requiring complex additional components or 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
The moth-eye structure effectively suppresses light reflection and propagation from the surrounding area to the image projection area, enhancing the visibility of the displayed image and reducing performance degradation of external environment sensors, while maintaining a sleek design and minimizing the substantive thickness of the window.
Implementation Method 1
an image projection surface (5A) of the window that is positioned closest to the cabin includes a prescribed image projection area (15) onto which the image is projected and a surrounding area (17) that surrounds the image projection area, and of the image projection area and the surrounding area of the image projection surface, only the surrounding area is formed with a moth-eye structure (53)
Data Source
AI summary
A vehicle body structure having a head-up display, includes: a window that defines a cabin and is used as a reflector of the head-up display; and an image projection device that projects an image toward the window. An image projection surface of the window that is positioned closest to the cabin includes a prescribed image projection area onto which the image is projected and a surrounding area that surrounds the image projection area. Of the image projection area and the surrounding area of the image projection surface, only the surrounding area is formed with a moth-eye structure.