Vehicle HUD Combiner Alignment With Adjustable Virtual Image Position
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Solution Overview
Problem
Existing vehicle display devices face challenges in improving visibility when displaying real and virtual images using a combiner, particularly in maintaining optimal relative positioning of virtual images with respect to real images across different eye positions, which affects visibility and requires an increased combiner height, leading to a larger device size.
Innovation Solution
A vehicle display device with an image display device having upper and lower display regions, a hood part covering the upper region, a combiner positioned on the eye side, a housing part with an opening for reflection, a reflection member to adjust the virtual image position, and a control unit to align sight lines from different eye positions, ensuring constant relative positioning of virtual and real images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the combiner height is increased to enable virtual image recognition from different eye positions, then visibility is improved, but device size increases
Solution Approach 1:
The patent applies the dynamics principle by making the reflection member rotatable to adjust its inclination angle dynamically. This allows the system to adapt to different eye positions without requiring a fixed increase in combiner height. The motor rotates the reflection member to change the optical path, enabling the virtual image to be viewed from various positions while maintaining a compact combiner structure.
Solution Approach 2:
The patent changes the inclination angle parameter of the reflection member to control the position of the virtual image. By adjusting this parameter through rotation, the system can accommodate different eye positions and improve visibility without physically increasing the combiner height, thus resolving the contradiction between visibility and device size.
2Reliability
If the relative position of virtual image with respect to real image varies depending on eye position, then visibility is reduced, but maintaining constant positioning increases device complexity
Solution Approach 1:
The patent implements feedback control by using a camera to detect the eye position and a control unit to process this information. The control unit then adjusts the reflection member's inclination angle based on the detected eye position, ensuring that the virtual image maintains a constant relative position with respect to the real image. This feedback mechanism improves visibility without requiring overly complex manual adjustment systems.
Solution Approach 2:
The system performs self-adjustment by automatically detecting eye position and controlling the reflection member accordingly. The camera and control unit work together to autonomously maintain optimal image positioning, eliminating the need for manual intervention and reducing operational complexity while improving visibility.
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 enhances visibility by maintaining a constant relative position of virtual images with respect to real images across varying eye positions, allowing for a reduced combiner height and device size while preventing visibility reduction due to external light interference.
Implementation Method 1
a reflection member that is disposed inside the housing part, is opposed to the combiner via the opening, and reflects display light of the lower display region toward the combiner
Data Source
AI summary
A vehicle display device includes: an image display device; a hood part; a combiner disposed on an eye point side with respect to an upper display region; a housing part that houses a lower display region and has an opening; a reflection member that is disposed inside the housing part, is opposed to the combiner via the opening, and reflects display light of the lower display region toward the combiner; a motor that adjusts a position of a virtual image based on an image in the lower display region in an image vertical direction by rotating the reflection member; and a control unit that controls the image display device and the motor. The control unit is configured to be able to adjust, to a predetermined position determined in advance, a relative position of a virtual image with respect to the upper display region when viewed from the eye point.