Variable Wedge Angle Windshield for Head-Up Display Ghosting
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Solution Overview
Problem
Conventional head-up displays often generate double images due to variations in the wedge angle between the front and back sides of the windshield, leading to inconsistent display distances and increased likelihood of ghosting effects.
Innovation Solution
A display device with a plate-shape translucent medium and a projection unit that adjusts the display distance by changing the wedge angle across different levels of the medium, ensuring a continuous decrease in the wedge angle with increasing level, thereby maintaining a one-to-one relationship between image position and wedge angle to prevent double image generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wedge angle of the windshield is increased to improve image reflection, then the display distance is improved, but double images are generated due to inconsistent wedge angles across different levels
Solution Approach 1:
The patent applies local quality by making the wedge angle vary continuously across different vertical levels of the windshield. Specifically, the wedge angle is designed to be larger at lower levels and smaller at higher levels, allowing each region to be optimized for its specific display distance requirement. This resolves the contradiction by enabling consistent display distance across different levels while preventing double image generation through localized angle adjustment.
Solution Approach 2:
The patent changes the wedge angle parameter continuously across different vertical levels of the windshield. By adjusting the wedge angle from larger values at lower levels to smaller values at higher levels, the system optimizes the reflection characteristics for each display distance. This parameter change approach allows the windshield to maintain consistent display distance while avoiding the double image problem that would occur with uniform wedge angles.
2Ease of manufacture
If a conventional windshield with uniform wedge angle is used, then manufacturing is simplified, but double images are generated when displaying images at different distances
Solution Approach 1:
The patent implements local quality by designing the windshield with spatially varying wedge angles across different vertical levels. Each level has a specifically optimized wedge angle tailored to its display distance requirements, with lower levels having larger angles and higher levels having smaller angles. This approach maintains manufacturing feasibility while significantly improving image quality and eliminating double image generation.
3Device complexity
If the wedge angle is kept constant across all levels, then the structure is simplified, but the one-to-one relationship between image position and wedge angle is lost causing double images
Solution Approach 1:
The patent resolves the contradiction between structural simplicity and display accuracy by implementing a continuously varying wedge angle profile across different vertical levels. This design maintains reasonable structural complexity while establishing the necessary one-to-one correspondence between image position and wedge angle. The continuous variation ensures that each vertical level has a unique, optimized wedge angle that prevents double image generation.
Solution Approach 2:
The patent applies the dynamics principle by transitioning from a static, uniform wedge angle structure to a dynamic, continuously varying wedge angle profile. This allows the windshield structure to adapt to different display distance requirements at different vertical levels, maintaining the one-to-one relationship between image position and wedge angle while preventing double image formation.
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 the generation of double images by ensuring that the image position and wedge angle relationship remains consistent across varying display distances, enhancing the clarity and reliability of the displayed information.
Implementation Method 1
a projection unit that projects light expressing an image onto the display medium such that the light is reflected toward a user by the display medium
Data Source
AI summary
To provide a display device that can suppress generation of a double image. Display device includes plate-shape windshield having translucency and a projection unit that projects light expressing an image onto windshield such that the light is reflected toward a user by windshield. The projection unit changes a display distance between an eye of the user and a position of an image visually recognized as a virtual image by the user through windshield by the light projection. Windshield is formed such that a wedge angle that is of an angle formed between a front side and a back side at a region located at any level of windshield is continuously decreased with increasing level.