Curved HUD Display Region for Low Depth Distortion
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Solution Overview
Problem
Existing head-up display devices suffer from significant distortion in the depth direction, which can lead to a perceived misalignment of virtual images, causing discomfort and potentially affecting safe vehicle operation.
Innovation Solution
The head-up display device incorporates a display region with a specific curved surface shape and convergence angle differences, ensuring that the virtual image is displayed in a way that minimizes depth direction distortion, even when the observer's eye position changes within the visual field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the front windshield (projection target member) is used as a curved surface for projection, then the virtual image can be displayed on the windshield, but image distortion occurs in the depth direction causing the virtual image to not be perceived as being on a single plane
Solution Approach 1:
The patent applies local quality by creating different curvature regions within the display region. Specifically, the display region includes a first curved surface portion with a first curvature radius and a second curved surface portion with a second curvature radius that is different from the first. This allows different parts of the display region to have optimized curvature characteristics, reducing depth direction distortion while maintaining the necessary curved projection surface on the windshield.
Solution Approach 2:
The patent segments the display region into multiple curved surface portions with different curvature radii. By dividing the display region into at least two distinct curved surface portions (first and second curved surface portions), each can be independently optimized to minimize depth distortion. This segmentation approach allows precise control over the optical path and image formation in different regions of the display.
2Adaptability or versatility
If the eye position of the observer changes within the visual field, then the optical path of image light changes, but this causes image distortion in the depth direction
Solution Approach 1:
The patent uses local quality by assigning different curvature radii to different curved surface portions to compensate for eye position variations. Each curved surface portion is optimized for specific viewing angles and eye positions, allowing the system to maintain low depth distortion across a range of eye positions within the visual field.
Solution Approach 2:
The patent implements dynamics by making the display region adaptable to different eye positions through its multi-curvature design. The combination of different curved surface portions creates a display system that dynamically adjusts the optical characteristics based on the observer's eye position, maintaining image quality and minimizing depth distortion regardless of where the observer's eyes are positioned within the visual field.
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
This solution effectively reduces the perceived distortion in the depth direction, allowing the virtual image to be viewed as if it were on a single plane, thereby enhancing the comfort and safety of vehicle operation.
Implementation Method 1
A head-up display device that generates a virtual image by image light reflected by a reflective transmissive member such as a front windshield and a combiner of a vehicle
Data Source
AI summary
A display region has a curved surface shape having upper and lower end portions disposed at positions closer to a visual field than a reference plane, and a central portion disposed at a position farther from the visual field than the reference plane. A first convergence angle difference between a convergence angle from the eye position to the upper end portion and a convergence angle from the eye position to a first point on the reference plane through the upper end portion, a second convergence angle difference between a convergence angle to the central portion and a convergence angle to a second point on the reference plane through the central portion, and a third convergence angle difference between a convergence angle to the lower end portion and a convergence angle to a third point on the reference plane through the lower end portion respectively fall within four milliradians.