Vehicle Display Control Device Using Height Sensor and Map Data
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Solution Overview
Problem
Existing vehicle information display systems face challenges in accurately correcting the display position of virtual images on windshields without complicating the sensor configuration, particularly when not all vehicles are equipped with multiple sensors like gyroscopes and yaw rate sensors.
Innovation Solution
A display control device that uses a single vehicle height sensor and three-dimensional map data to correct the projection position of a display light image, accounting for road gradients and vehicle orientation, thereby reducing the need for multiple sensors and minimizing virtual image deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors (gyroscope, G sensor, yaw rate sensor) are used to correct display position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary sensors from the system. By using only a single vehicle height sensor to measure vertical displacement and deriving pitch angle information from this measurement combined with vehicle behavior information, the system removes the need for gyroscopes, G sensors, and yaw rate sensors, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The single vehicle height sensor performs multiple functions: it measures vertical displacement of the vehicle body and provides pitch angle information for display correction. Additionally, the display control device integrates multiple data sources (height sensor measurements, vehicle behavior information from existing systems, and map data) to achieve comprehensive position correction without adding dedicated sensors for each function
2Device complexity
If a single vehicle height sensor is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges multiple information sources to compensate for the limitations of a single sensor. The display control device combines vertical displacement measurements from the height sensor, vehicle behavior information (acceleration, steering angle, brake information) from existing vehicle systems, and gradient information from map data to comprehensively determine and correct display position, thereby maintaining measurement precision despite using fewer sensors
Solution Approach 2:
The display control device acts as an intermediary that processes and integrates data from the single height sensor with vehicle behavior information and map data. This intermediary processing enables the system to derive accurate pitch angle and display position information from limited sensor inputs by combining multiple data sources through computational methods
Data Source
AI summary
A display control device controls display of a virtual image which is superimposed on foreground of a vehicle by projection of a display light image from an optical unit to a projection area. The display control device sets a projection position of the display light image which is projected in the projection area on the basis of a relative position of a superimposition object on which the virtual image is superimposed, obtains a measurement information from one vehicle height sensor measuring a displacement in a vertical direction occurring in the vehicle, obtains a gradient information indicating a gradient of a road on which the vehicle travels on the basis of three-dimensional map data, and corrects the projection position of the display light image on the basis of the measurement information and the gradient information.