Windshield Direction Display Alignment Using Map-Based Position Correction

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Solution Overview

Problem

Existing vehicle display systems misalign direction images due to sensor instability, leading to misalignment between displayed and actual vehicle routes, particularly at route change points.

Innovation Solution

A vehicle display controller that corrects the positional relationship of a vehicle on a pre-generated map to its actual position using sensor data, aligning the displayed direction image with the vehicle's actual heading direction by comparing virtual and actual path angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If sensor data is used to determine vehicle facing direction, then direction guidance can be provided, but misalignment occurs between displayed direction images and actual vehicle route due to sensor instability

Engineering Contradiction:

Improvedirection image alignment accuracyVSAvoidsensor output stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system continuously acquires actual vehicle position data from sensors and compares it with the pre-generated map data, then corrects the directional information based on this feedback loop. This real-time comparison and correction mechanism compensates for sensor instability by constantly adjusting the direction images to match the actual vehicle route.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces map data as an intermediary reference frame. Instead of directly relying on potentially unstable sensor data for direction determination, the system uses the stable pre-generated map as a mediator to correct and validate the sensor-derived directional information, thereby improving alignment accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If direction guidance images are displayed without correction, then display simplicity is maintained, but misalignment between virtual map route and actual vehicle position occurs

Engineering Contradiction:

Improvedisplay system simplicityVSAvoidroute alignment accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system performs preliminary correction of directional information by comparing actual vehicle position with the pre-generated map before displaying the direction images. This advance correction ensures that the displayed guidance is already aligned with the actual route, maintaining display simplicity while achieving high precision through pre-processing.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12584759B2Vehicle display controller, vehicle display device, vehicle, vehicle display control method, and non-transitory computer readable storage medium recorded with vehicle display control program

Publication Date: 2026.03.24 TOYOTA JIDOSHA KK

AI summary

A vehicle display that is configured to: acquire a position of a vehicle, via a sensor; correct a positional relationship of a vehicle on a pre-generated map to an actual positional relationship of the vehicle as derived from the acquired position of the vehicle; and based on a result of correction, cause display of a direction image indicating a heading direction of the vehicle at a display area provided at a windshield glass in front of an occupant.