Head-Up Display Incident Angle Adjustment Mechanism
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Solution Overview
Problem
Head-up display devices face challenges in maintaining a consistent display image position and depression angle due to variations in the eyepoint position of occupants, leading to noticeable changes in the incident position and resulting image distortion.
Innovation Solution
A head-up display device with a housing, projection unit, and optical unit that includes a magnifying optical unit, a screen, and an incident angle changing unit, where the reflecting mirror is movable to adjust the incident angle of light on the screen, maintaining a consistent virtual image position despite changes in the eyepoint position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the concave mirror is rotated to adjust the incident position according to eyepoint position variations, then the incident position can be adjusted, but the depression angle of the display image varies causing image position instability
Solution Approach 1:
The patent divides the adjustment function into two independent components: a first reflecting mirror for adjusting the incident position on the windshield, and a second reflecting mirror for adjusting the depression angle. This segmentation allows each component to perform its specific function without interfering with the other, resolving the contradiction between adaptability and stability.
Solution Approach 2:
The patent introduces a screen as an intermediary element between the projection unit and the reflecting mirrors. The screen displays the image which is then reflected by the first and second reflecting mirrors to the windshield. This intermediary structure enables independent control of incident position and depression angle through the respective mirrors.
2Device complexity
If a simple mirror rotation method is used to adjust incident position, then the device complexity is low, but the depression angle changes causing image distortion
Solution Approach 1:
The patent employs two independently adjustable reflecting mirrors that can be dynamically positioned to control different parameters of the light path. The first reflecting mirror dynamically adjusts the incident position while the second dynamically adjusts the depression angle, enabling precise control without excessive device complexity.
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 changes in the depression angle of the display image, reducing image distortion and maintaining a stable image position, even when the incident position on the windshield varies, compared to traditional methods that rely on rotating the concave mirror.
Implementation Method 1
a magnifying optical unit (17) attached to the housing (11) and reflecting the light toward the windshield (3)
Implementation Method 2
a screen (19) attached to the housing (11) and reflecting or transmitting the light toward the magnifying optical unit (17)
Data Source
AI summary
A head-up display device includes a housing, a projection unit projecting light representing an image, and an optical unit leading the light projected from the projection unit to a windshield of a vehicle. The optical unit includes a magnifying optical unit attached to the housing and reflecting the light toward the windshield, a screen attached to the housing and reflecting or transmitting the light toward the magnifying optical unit, and an incident angle changing unit changing an incident angle of the light that goes incident on the screen.