Pixel Headlamp Projection Compensation for Vehicle Pitch Vibration

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Solution Overview

Problem

Rapid changes in the pitch angle of a vehicle body during travel cause blurring of projected figures on the road face, degrading visibility due to stretching or skewing of the projected pattern.

Innovation Solution

A lamp system with individually controllable pixels, a vibration sensor, and a controller that generates an input image by narrowing the dimensions of the projected pattern in response to vehicle vibrations, particularly in the pitching direction, to maintain clear visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the pitch angle changes rapidly during vehicle travel, then the projection position changes dynamically, but the projected figure becomes blurred and visibility degrades

Engineering Contradiction:

Improvepitch angle change speedVSAvoidprojection position accuracy

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The controller predicts the future pitch angle based on current pitch angle and its rate of change, then pre-adjusts the projection position to compensate for upcoming vibrations. This preliminary action allows the projection to remain stable despite rapid pitch angle changes, preventing blur and maintaining visibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system creates a corrected projection image that compensates for vibration effects by calculating the inverse of the predicted pitch angle change. This corrected image is then projected instead of the original, effectively copying and adjusting the pattern to counteract the expected motion blur.

Inventive Principle:

Principle #26Copying

2Speed

If the pitch angle changes within a narrow range rapidly, then the figure is stretched in the front-rear direction, but this brings figures closer or skews proportions, degrading visibility

Engineering Contradiction:

Improvepitch angle change speedVSAvoidprojected figure shape

Core Design Contradiction:

SpeedVSShape

Solution Approach 1:

The controller predicts the pitch angle change and pre-distorts the projection image in the opposite direction of the expected distortion. By applying this preliminary correction, the rapid pitch angle changes cause the figure to appear undistorted on the road surface, maintaining proper proportions and spacing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the projection parameters (position, size, shape) based on the predicted pitch angle and its rate of change. By changing these parameters in real-time according to vehicle motion, the projection maintains correct geometric relationships despite rapid pitch variations.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4681988A1Light-fixture system, lamp controller, and control method

Publication Date: 2026.01.21 KOITO MFG CO LTD

Figure 1A~1B
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AI summary

In a lamp system 100, a high-definition lamp unit 110 has a plurality of pixels PIX individually controllable in response to an input image IMG1, and is structured to illuminate a road face with a beam BM having a light distribution pattern that corresponds to states of the pixels PIX. A sensor 120 is structured to detect vibration of a vehicle body. A controller 200 is structured to narrow a dimension in the direction of the vibration of a figure contained in a source image IMGO that specifies a pattern to be projected on the road face, thereby correcting the source image.