Toroidal Backlight Mirror for Adjustable HUD Eye Box
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Solution Overview
Problem
Conventional head-up display devices experience image dimming, blurring, or invisibility when a viewer's eyes move due to misalignment of the eye box, caused by the use of a backlight concave mirror and imaging semi-reflector.
Innovation Solution
A head-up display device utilizing a rotatable backlight Toroidal mirror with X-axis and Y-axis curvatures adjusts the eye box by rotating around its central axis, maintaining clear and bright images by elongating or shortening the eye box range to accommodate viewer movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional backlight concave mirror is used to reflect the backlight beam, then the backlight beam can be focused to form an image, but the eye box range is fixed and cannot accommodate viewer eye movement, causing the image to become dim, blurry, or invisible
Solution Approach 1:
The patent applies the dynamics principle by making the backlight mirror rotatable around its central axis, transforming the fixed eye box into an adjustable one. The mirror can rotate to change the backlight real image position along the optical path, dynamically accommodating viewer eye movement while maintaining image quality. This resolves the contradiction by enabling adaptability without sacrificing reliability.
Solution Approach 2:
The patent applies parameter changes by altering the mirror's rotational angle to adjust the eye box range. By changing the rotational parameter of the backlight mirror, the system can elongate or shorten the eye box range along the optical path, allowing the fixed physical mirror to achieve variable eye box dimensions that accommodate different viewing positions.
2Ease of operation
If the viewer's eyes move back and forth, then the viewer can change viewing position, but the fixed eye box cannot overlap with the moved eyes, causing the image to become dim, blurry, or invisible
Solution Approach 1:
The rotatable backlight mirror enables dynamic adjustment of the eye box position along the optical path. When viewer eyes move, the mirror can be rotated to reposition the backlight real image, ensuring continuous overlap between the eye box and viewer eyes, thereby maintaining image brightness and clarity throughout the viewing range.
Solution Approach 2:
The system implies feedback mechanism where the viewer's eye position or movement is detected, and the backlight mirror rotation is adjusted accordingly to maintain proper alignment. This feedback loop ensures that the eye box continuously adapts to viewer position changes, preventing image dimming or blurring.
3Device complexity
If a fixed eye box is used, then the device structure is simple, but it cannot accommodate viewer eye movement, resulting in image degradation
Solution Approach 1:
The patent introduces a single rotational degree of freedom to the backlight mirror, adding minimal complexity while achieving significant adaptability. The rotatable mirror allows the eye box to be adjusted along the optical path without requiring complex multi-component systems, thus resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The rotatable backlight mirror serves multiple functions: it focuses the backlight beam, adjusts the eye box range, and accommodates viewer eye movement. This multi-functionality reduces the need for separate components, maintaining overall system simplicity while enhancing adaptability.
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 ensures that the viewer maintains a bright and clear image by keeping their eyes within the adjusted eye box, even when moving, through the use of a rotatable Toroidal mirror with specific curvature configurations and brightness adjustments.
Implementation Method 1
the backlight Toroidal mirror is used to reflect the backlight beam of the backlight light source
Implementation Method 2
the backlight source is reflected and focused on an X-axis backlight focusing plane by the X-axis curvature, the backlight source is reflected and focused on a Y-axis backlight focusing plane by the Y-axis curvature
Implementation Method 3
the imaging concave mirror configured to reflect the image beam to the imaging semi-reflector to form a display panel virtual image on a side of the imaging semi-reflector away from a viewer, and a backlight real image which is on another side of the imaging semi-reflector close to the viewer
Implementation Method 4
After the virtual image DP_im behind the imaging concave mirror Mr_F is reflected by the imaging semi-reflector Mr_SR, the image virtual image DP-im in front of the vehicle is formed. After the backlight real image BL_re in front of the imaging concave mirror Mr_F is reflected by the imaging semi-reflector Mr_SR, the backlight real image BL_re is formed in the viewer's eyes E
Data Source
AI summary
A head up display that utilizes a backlight Toroidal mirror to adjust the eye box is suitable for use with an imaging semi-reflector and includes a backlight source, a backlight Toroidal mirror, a display panel, and an imaging concave mirror. The backlight Toroidal mirror is rotatable and has an X-axis curvature and a Y-axis curvature different from the X-axis curvature, and can reflect the backlight beam of the backlight source. The backlight beam reflected by the backlight Toroidal mirror forms a backlight real image located in the viewer's eye after passing through the display panel, the imaging concave mirror, and the imaging semi-reflector. The backlight real image is called the eye box. The rotation of the backlight Toroidal mirror elongates or shortens the eye box, allowing the viewer's eyes to remain inside the eye box when the viewer's eyes are moving back and forth.