Head-Up Display Viewpoint Loss Warping Control

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Solution Overview

Problem

In head-up display (HUD) devices, the sudden change in the appearance of the virtual image due to viewpoint position loss and re-detection causes discomfort to the driver, as existing warping processing methods fail to completely correct distortion across the entire eye box, leading to residual distortion, especially when the viewpoint moves within or out of the eye box.

Innovation Solution

A display control device that maintains the warping parameter immediately before viewpoint loss and disables warping processing upon re-detection for a controlled period, allowing a gradual update of the warping parameter to minimize sudden changes in the virtual image, thereby reducing driver discomfort and maintaining visual stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If viewpoint position follow-up warping control is performed to update the warping parameter in accordance with the driver's viewpoint position, then the distortion of the virtual image is reduced, but when the viewpoint position is lost and then re-detected, the appearance of the virtual image changes instantaneously, causing discomfort to the driver

Engineering Contradiction:

Improvedistortion correction precisionVSAvoiddriver discomfort

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary action by detecting viewpoint position loss in advance and maintaining the previous warping parameter during the loss period. When the viewpoint is re-detected, the system continues to use the maintained parameter for a predetermined period before switching to the new parameter, preventing instantaneous changes and driver discomfort while preserving distortion correction accuracy

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the warping parameter update strategy based on the viewpoint loss state. During viewpoint loss, the parameter update is suspended and the previous parameter is maintained. After re-detection, the system transitions from maintaining the old parameter to gradually adopting the new parameter over a predetermined period, creating a dynamic response that balances distortion correction with visual stability

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If the warping parameter is updated immediately after viewpoint re-detection, then the distortion correction is optimized for the new position, but the sudden change in virtual image appearance causes visual instability and driver discomfort

Engineering Contradiction:

Improvewarping parameter accuracyVSAvoidvirtual image stability

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The system prepares for parameter transition by maintaining the previous warping parameter during the predetermined period after viewpoint re-detection. This preliminary maintenance action ensures that the virtual image remains stable and prevents sudden appearance changes, while still progressing toward the optimized parameter for the new viewpoint position

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system controls the timing and manner of parameter changes by delaying the switch from the old warping parameter to the new one. The predetermined period after viewpoint re-detection serves as a transition window where the parameter change is managed to balance accuracy improvement with visual stability, avoiding abrupt changes that would cause driver discomfort

Inventive Principle:

Principle #35Parameter changes

3Speed

If simple viewpoint position follow-up warping is performed after viewpoint loss, then the system responds quickly to the re-detected position, but the residual distortion in different areas of the eye box causes significant appearance changes in the virtual image

Engineering Contradiction:

Improveviewpoint re-detection response speedVSAvoiddistortion uniformity across eye box

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The system performs preliminary action by maintaining the previous warping parameter during the predetermined period after viewpoint re-detection. This approach prioritizes visual stability over immediate response speed, preventing the significant appearance changes that would result from quickly applying a new parameter calculated with residual distortion variations across the eye box

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230008648A1Display control device and head-up display device

Publication Date: 2023.01.12 NIPPON SEIKI CO LTD

AI summary

In the case in which a loss of the viewpoint position of a driver occurs when a viewpoint position follow-up warping control is executed to update warping parameters according to the viewpoint position of the driver, and then the viewpoint position is re-detected, it is suppressed that the appearance of an image instantaneously changes in accordance with the update of the warping parameters and the driver is caused to feel uneasy. When the viewpoint loss in which at least one position of the right and left viewpoints becomes unclear is detected, a control unit, which executes the viewpoint position follow-up warping control, maintains, in a viewpoint loss period, the warping parameters set immediately before the viewpoint loss period, and, when the viewpoint position is re-detected after the viewpoint loss period, invalidates at least one warping process using the warping parameters corresponding to the re-detected viewpoint position.