Head-Up Display Backlight Mirrors for Dynamic Eyebox Alignment
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Solution Overview
Problem
Existing head-up displays face issues with image quality degradation and incomplete viewing due to the movement of the viewer's eyes, as the position of the backlight source-based real image (eyebox) does not adjust accordingly, leading to reduced brightness and optical efficiency.
Innovation Solution
A head-up display system utilizing a switchable adjustment mirror device with multiple mirrors of varying curvatures, allowing the backlight source-based real image (eyebox) to dynamically adjust with the viewer's eye position through a roller or turntable mechanism, maintaining image integrity and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the backlight source is arranged within the focal length of the imaging concave mirror to form a magnified virtual image, then the imaging distance is increased, but the optical efficiency is reduced and the eyebox becomes larger and less precise
Solution Approach 1:
The patent introduces a movable backlight source that can dynamically adjust its position along the optical axis. By moving the backlight source between different positions (within focal length for virtual image, beyond focal length for real image), the system adapts to different viewing conditions and maintains optimal optical efficiency while achieving the required imaging distance
Solution Approach 2:
The patent changes the key parameter of backlight source position relative to the focal point. By adjusting this position parameter, the system transitions between forming virtual images (within focal length) and real images (beyond focal length), thereby optimizing the balance between imaging distance and optical efficiency
2Loss of energy
If the backlight source is arranged beyond the focal point to form a smaller real image at the eyebox, then the optical efficiency is improved, but the light beam diffusion increases and image brightness decreases
Solution Approach 1:
The movable backlight source allows dynamic adjustment between positions that prioritize optical efficiency (beyond focal point) and those that prioritize image brightness (within focal point with additional lighting compensation), enabling the system to adapt to different operational requirements
3Device complexity
If the backlight source position is fixed, then the device complexity is reduced, but the image quality degrades when the viewer's eye position changes
Solution Approach 1:
The patent implements a movable backlight source that can dynamically track and adjust to the viewer's eye position. This dynamic adjustment mechanism maintains consistent image quality and optimal eyebox positioning even when the viewer moves, thereby improving reliability without excessive complexity
Solution Approach 2:
The system incorporates eye tracking or position detection feedback to control the backlight source movement. This feedback mechanism ensures the backlight source continuously adjusts to maintain optimal imaging conditions, preserving image quality consistency across different viewing positions
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 system ensures consistent image brightness and quality by adaptively adjusting the position of the eyebox to match the viewer's changing position, enhancing optical efficiency and maintaining a clear, complete image.
Implementation Method 1
the image projected by the picture generation unit PGU1 is reflected and magnified by the imaging concave mirror 5
Implementation Method 2
the display panel 4 is arranged within the focal length of the imaging concave mirror 5, in order to form a display panel-based virtual image G that is magnified
Implementation Method 3
the display panel-based virtual image G is partially reflected by the imaging semi-reflective mirror 6 to the eyes E of the viewer
Implementation Method 4
allowing a portion of front scenery light to penetrate therethrough to reach the eyes of the viewer at the same time
Implementation Method 5
a backlight source for projecting a backlight beam
Implementation Method 6
the backlight beam reflected by the backlight concave mirror, to penetrate therethrough in order to form an image light beam
Implementation Method 7
a switchable adjustment mirror device including a plurality of mirrors of different curvatures, and each one of the plurality of mirrors configured to be selective to reflect the backlight beam from the backlight source
Implementation Method 8
a backlight concave mirror arranged to reflect the backlight beam reflected by one of the plurality of mirrors
Implementation Method 9
to form a backlight source-based virtual image that is magnified and is at a longer distance from the rear of the backlight concave mirror
Implementation Method 10
the imaging concave mirror arranged to reflect the image light beam to the imaging semi-reflective mirror to form a display panel-based virtual image and to form a backlight source-based real image at one side of the imaging semi-reflective mirror close to the viewer and positioned at eyes of the viewer
Implementation Method 11
when the backlight source 1 exceeds the focal point F and is close to the focal point F, the light from the backlight source 1 of the picture generation unit PGU1 is reflected by the imaging concave mirror 5 to form a backlight source-based real image BL_re5 of a large size
Data Source
AI summary
A head-up display using a backlight to control an eyebox, is applicable to being used with an imaging semi-reflective mirror, and includes a backlight source, a switchable adjustment mirror device, a backlight concave mirror, a display panel and an imaging concave mirror. The switchable adjustment mirror device is positioned at the light path between the backlight source and the backlight concave mirror and includes a plurality of mirrors having different curvatures, and each one of the mirrors can be selected to reflect the backlight beam from the backlight source to the backlight concave mirror. Accordingly, the position of the eyebox can be controlled to match with the position of the eyes of the viewer.