Windshield HUD Hologram Shape for Stray Light Suppression
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Solution Overview
Problem
Conventional display devices with rectangular emission holograms for virtual image projection on curved windshields suffer from low light utilization efficiency and stray light emission due to mismatched shapes, leading to decreased image quality and increased distortion.
Innovation Solution
A display device featuring a light guide with a non-rectangular quadrilateral emission hologram element that corresponds to the curved shape of the windshield, enhancing light utilization and reducing stray light by adjusting the inclination of hologram elements to match the windshield's curvature, thereby improving image projection efficiency and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rectangular emission hologram is used in a conventional display device, then the device structure is simple and easy to manufacture, but light utilization efficiency is low and stray light is generated due to shape mismatch with curved windshield
Solution Approach 1:
The emission hologram is changed from a conventional rectangular shape to a non-rectangular quadrilateral shape that corresponds to the curved shape of the windshield. This asymmetric design allows the hologram to match the curvature of the windshield surface, improving light utilization efficiency and reducing stray light generation while maintaining ease of manufacture through standard fabrication processes.
Solution Approach 2:
The emission hologram is designed with locally optimized geometry where the non-rectangular quadrilateral shape specifically matches the curved regions of the windshield. This local adaptation ensures that light is efficiently directed only toward the intended display areas on the curved surface, preventing energy loss and stray light while keeping the overall device structure relatively simple.
2Ease of manufacture
If a rectangular emission hologram is used, then manufacturing is easier, but image quality decreases and distortion increases due to shape mismatch
Solution Approach 1:
The emission hologram adopts a non-rectangular quadrilateral shape that asymmetrically matches the curved geometry of the windshield. This design improvement enhances image quality and reduces distortion by ensuring proper light direction across the curved surface, while the hologram can still be manufactured using standard processes, maintaining ease of manufacture.
Solution Approach 2:
The hologram structure is locally optimized with a non-rectangular quadrilateral configuration that specifically addresses the curvature characteristics of the windshield. This local geometric adaptation improves image clarity and reduces distortion in the displayed virtual image without requiring complex manufacturing techniques.
3Loss of energy
If a non-rectangular quadrilateral emission hologram is used to match curved windshield, then light utilization efficiency is improved and stray light is suppressed, but device complexity increases
Solution Approach 1:
The emission hologram is designed as a non-rectangular quadrilateral to match the curved windshield geometry. This asymmetric shape improves light utilization efficiency by directing light only toward intended display areas and suppresses stray light generation. The design maintains relatively simple device structure by using a single hologram element rather than multiple components.
Solution Approach 2:
The non-rectangular quadrilateral emission hologram provides local geometric optimization that matches the curved windshield surface. This localized design improvement enhances light utilization and reduces stray light without requiring additional complex devices or multiple hologram elements, thus avoiding significant increases in device complexity.
4Manufacturing precision
If a non-rectangular quadrilateral emission hologram is used to match curved windshield, then image quality and clarity are improved, but manufacturing complexity increases
Solution Approach 1:
The emission hologram employs a non-rectangular quadrilateral shape that asymmetrically matches the curved windshield. This design improves image quality and reduces distortion by properly directing light across the curved surface. The hologram can be manufactured using standard fabrication processes, maintaining ease of manufacture despite the non-rectangular geometry.
Solution Approach 2:
The emission hologram features local geometric optimization with a non-rectangular quadrilateral configuration that matches specific curved regions of the windshield. This localized design improvement enhances image quality and clarity while being compatible with conventional manufacturing techniques, avoiding significant increases in manufacturing complexity.
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 effectively suppresses stray light emission and enhances light utilization, ensuring a clear, distortion-free virtual image projection onto the windshield, improving the overall display quality and user experience.
Implementation Method 1
a first hologram element having a non-rectangular quadrilateral shape, wherein the first hologram element emits, toward the display medium, the light representing the image and propagating through the light guide
Data Source
AI summary
A display device displays a virtual image by projecting an image onto a windshield provided on a vehicle and having a curved shape. The display device includes: an image generation device that generates light (image light) representing an image; and a light guide that includes an emission hologram element having a non-rectangular quadrilateral shape. The emission hologram element emits, toward the windshield, the light representing the image and propagating through the light guide.