Head-Up Display Dynamic Area Adjustment for Pitch Misalignment
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Solution Overview
Problem
Head-up displays struggle to maintain accurate alignment of virtual images with actual scenes during vehicle maneuvers, leading to a perceived narrowing of the display area and potential distraction for the driver.
Innovation Solution
The head-up display system adjusts the virtual image display area based on vehicle attitude and viewpoint information to maintain alignment and prevent the perception of a narrowed display, using a control unit to enlarge the virtual image area when misalignment occurs, and adjust the enlargement direction and amount to minimize distraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the head up display projects the display surface to a fixed area on the windshield, then the display position on the windshield remains stable, but the virtual image displayable area becomes misaligned from the actual scene area when vehicle pitch changes
Solution Approach 1:
The patent implements dynamic adjustment of the display surface projection position based on detected vehicle pitch angle. The control unit calculates the pitch angle from acceleration sensor data and dynamically shifts the projection area on the windshield to compensate for pitch-induced misalignment, maintaining accurate overlay of virtual images on the actual scene throughout vehicle maneuvers
Solution Approach 2:
The system employs feedback control by continuously monitoring vehicle acceleration and pitch angle through sensors, then using this information to adjust the display surface projection position in real-time. This closed-loop control ensures the virtual image displayable area remains accurately aligned with the actual scene area despite changes in vehicle attitude
2Manufacturing precision
If the head up display adjusts the display position to maintain alignment with the actual scene during pitch changes, then the alignment precision is improved, but the display area on the windshield shifts and may leave blank areas
Solution Approach 1:
The patent defines a compensation area on the windshield that surrounds the normal projection area. During pitch changes, the display surface projection is shifted within this compensation area, allowing the main display content to remain aligned with the actual scene while preventing blank areas from appearing in the critical viewing region
Solution Approach 2:
The system addresses the display area coverage issue by utilizing the vertical dimension of the windshield more effectively. The compensation area extends vertically to accommodate pitch-induced shifts, allowing the projection to move up and down while maintaining horizontal alignment with the actual scene, thus preserving both alignment precision and display area coverage
3Ease of operation
If the virtual image display area is enlarged when misalignment occurs, then the perceived narrowing of display area is prevented, but the device complexity increases due to dynamic area adjustment control
Solution Approach 1:
The patent dynamically changes the parameter of virtual image display area size based on detected pitch angle magnitude. When pitch exceeds a threshold indicating significant misalignment, the system enlarges the virtual image display area to compensate for the perceived narrowing, while returning to normal size when pitch is minimal, thus adapting to viewer comfort needs without constant enlargement
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 ensures a continuous and unobstructed display of virtual information, preventing the feeling of a narrowed display area and maintaining driver attention by dynamically adjusting the virtual image area according to vehicle and viewer position changes.
Implementation Method 1
a head up display for displaying a virtual image on a virtual image displayable area overlapping an actual scene on the outside of the vehicle by projecting a display light on a transmissive reflector
Data Source
AI summary
The present invention is capable of making it difficult to perceive the narrowness of a display area of a virtual image. Provided is a head-up display which projects display light on a transmission/reflection part to display a first virtual image in an area in which the virtual image can be displayed, said area being superimposed on an actual view outside of a vehicle, wherein, when deviation occurs in the relative positions of the actual view and the transmission/reflection part from the perspective of a viewer, a control unit enlarges a virtual image display area, which sets the range in which the first virtual image is displayed within the area in which the virtual image can be displayed, so as to be larger than normal.