Vehicle HUD Projection Correction for Windshield Distortion
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Solution Overview
Problem
Existing vehicle head-up display (HUD) systems suffer from image distortion due to the curvature and inclination of windshields, requiring frequent manual adjustments or complex operations to correct the distortion as the driver's viewpoint changes.
Innovation Solution
A vehicle display device with a projecting direction changing mechanism and a display control unit that adjusts the light projection direction and selects correction patterns based on the driver's eye level and windshield variations, automatically correcting image distortion without requiring driver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual operation switch is used for image correction, then image distortion can be corrected, but the driver needs to frequently operate the switch when viewpoint changes
Solution Approach 1:
The system automatically detects the driver's viewpoint position and selects the appropriate correction pattern without requiring manual operation. The viewpoint detection unit and correction pattern selection unit work together to make the system self-adjusting, eliminating the need for frequent manual switch operations while maintaining accurate distortion correction.
2Manufacturing precision
If coordinate conversion table is stored in external ROM for distortion correction, then image distortion can be corrected, but it requires replacing external ROM or rewriting non-volatile memory when distortion changes
Solution Approach 1:
The system uses a volatile memory (RAM) to store multiple correction patterns that can be dynamically selected based on the detected viewpoint position. This eliminates the need to replace or rewrite non-volatile memory, as the system can switch between different correction patterns in RAM in real-time according to the driver's viewpoint changes.
3Manufacturing precision
If fixed correction pattern is used, then image distortion is corrected for one viewpoint, but distortion level changes when viewpoint position changes
Solution Approach 1:
The correction patterns are segmented into multiple discrete patterns stored in the correction pattern storage unit, each corresponding to a specific viewpoint position. The viewpoint detection unit identifies which segment or pattern is appropriate for the current viewpoint, and the correction pattern selection unit selects the matching pattern. This segmented approach allows the system to maintain accurate distortion correction across multiple different viewpoint 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 solution improves operability by automatically correcting image distortion across varying driver positions and windshield shapes, reducing the need for complex operations and ensuring a distortion-free visual experience.
Implementation Method 1
display light including various kinds of information to be displayed as an image from an HUD unit onto a reflection board referred to as a front windshield or a combiner and form an optical path in such a manner that the light reflected on the front windshield and the like heads toward the viewpoint of a driver
Data Source
AI summary
A vehicle display device according to the present invention includes a projecting direction changing mechanism that can adjust a light projecting direction in which display light including a certain image is emitted and a display control unit that changes a correction pattern for correcting the shape of the image according to the projecting direction adjusted by the projecting direction changing mechanism and corrects the shape of the image based on the correction pattern. With the vehicle display device according to the present invention, the display light including the shape of the image corrected by the display control unit is emitted and guided to a windshield, so that the display light reflected on the surface of the windshield is visually recognized.