Head-Up Display Mirror Structure for Rigidity and Stray Light Control
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Solution Overview
Problem
Conventional head-up displays experience a decrease in image quality due to reduced rigidity at the end portion of the concave mirror, leading to bending and deformation of the image projected, which affects the quality of the virtual image displayed.
Innovation Solution
A head-up display design that incorporates a first mirror with a base having a step-shaped end portion and a rib on its rear side, increasing the rigidity and reducing deformation, while also incorporating a rough surface to minimize sink marks and stray light effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the end portion of the concave mirror is made thinner to reduce sink marks, then the manufacturing quality improves, but the rigidity decreases causing bending and image deformation
Solution Approach 1:
The patent applies different surface treatments to different regions of the mirror. The end portion has a rough surface treatment that reduces sink mark visibility, while the reflection surface maintains high precision. This local differentiation allows the thin end portion to function properly without compromising overall image quality.
Solution Approach 2:
The patent introduces a rib structure on the rear side of the end portion, adding a third dimension to compensate for the reduced thickness. This rib provides structural support and maintains rigidity without affecting the optical performance of the reflection surface.
2Strength
If a rib is added to the rear side of the end portion, then the rigidity increases, but the device complexity increases
Solution Approach 1:
The rib structure is integrated into the mirror substrate as a single molded piece, combining the support function with the existing mirror structure. This merging approach increases rigidity without requiring separate support components or complex assembly procedures.
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 design enhances the image quality by reducing deformation and stray light issues, maintaining the rigidity of the end portion, and improving the overall projection of virtual images.
Implementation Method 1
The base includes an end portion (21) including a rough surface and provided between the reflection surface (20) on the first surface (17) and a perimeter of the base (16)
Implementation Method 2
a reflection surface provided on the first surface
Data Source
AI summary
A head-up display that projects a virtual image onto a display medium includes: a display that emits display light that forms an image to be displayed; and a first mirror that forms a virtual image on a side opposite an observer across the display medium by guiding an image displayed by the display to the display medium. The first mirror includes: a base having a first surface and a second surface on opposite sides of the base; and a reflection surface provided on the first surface. The base includes an end portion including a rough surface and provided between the reflection surface on the first surface and a perimeter of the base. A rib is provided on a rear side of the end portion.