Vehicle Display Cover Geometry to Correct Distortion and Suppress Ghosting
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Solution Overview
Problem
Existing vehicle display devices face challenges in improving image quality while preventing ghosting, which can occur due to external light interference, often requiring additional components that increase complexity.
Innovation Solution
A vehicle display device with a housing, an image display device, a mirror, and a transparent cover where the cover's inner surface is a free-form surface designed to correct image distortion and aberration, and the angular difference between the outer and inner surfaces is set to prevent total internal reflection of external light, thereby reducing ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cover shape is designed to correct image distortion, then image quality is improved, but ghosting due to external light may occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the angular difference between the outer and inner surfaces of the transparent cover. By setting this angular difference within a specific range, the design corrects image distortion while preventing total internal reflection of external light, thus eliminating ghosting. This quantitative parameter control resolves the contradiction between image quality improvement and ghosting prevention.
2Manufacturing precision
If additional components are added to correct distortion, then image quality improves, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple components into a single transparent cover. The cover simultaneously serves as a protective element and an image correction element by incorporating a free-form surface design. This integration eliminates the need for separate distortion correction components, thereby improving image quality while reducing device complexity.
Solution Approach 2:
The transparent cover is designed to perform multiple functions: it protects the internal components, corrects image distortion through its free-form surface, and prevents ghosting by controlling the angular difference between its surfaces. This multi-functionality eliminates the need for additional dedicated components, resolving the contradiction between image quality improvement and device complexity reduction.
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 enhances image quality by correcting distortion and aberration while suppressing ghosting, allowing for a more compact and efficient display device design without unnecessary components.
Implementation Method 1
the inner surface is a free-form surface formed to correct distortion or aberration of the image
Implementation Method 2
a mirror that is disposed inside the housing, faces the windshield via the opening, and reflects the display light toward the windshield
Implementation Method 3
an angular difference between the outer surface and the inner surface in the cross section is set to a value within a range in which external light incident on an inside of the cover from the outer surface is not totally reflected inside the cover
Data Source
AI summary
A vehicle display device includes a housing that has an opening facing a windshield, an image display device that outputs display light of an image, a mirror that reflects the display light toward the windshield, and a transparent cover that is disposed in the opening, in which the cover has an outer surface facing the windshield and an inner surface facing the mirror, and has a shape curved toward the inside of the housing in a cross section orthogonal to an image lateral direction, the inner surface is a free-form surface formed to correct distortion or aberration of the image, and an angular difference between the outer surface and the inner surface in the cross section is set to a value within a range in which external light incident on the inside of the cover from the outer surface is not totally reflected inside the cover.