Vehicle Headlight Light Pattern Layout for Pedestrian Detection
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Solution Overview
Problem
Current headlight devices for vehicles are insufficient in ensuring pedestrian visibility, particularly under adverse conditions like nighttime and rainy weather, leading to a higher risk of overlooking pedestrians on straight roads.
Innovation Solution
A headlight device featuring a first light illuminator that alternates bright and dark areas in a specific pattern, combined with a second light illuminator providing a spotlight distribution area, enhances pedestrian visibility by leveraging human visual characteristics to quickly detect movement and shape recognition, even in adverse conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional headlight illuminates the road ahead with uniform light distribution, then the overall visibility is maintained, but pedestrians on the roadside are easily overlooked especially under adverse conditions
Solution Approach 1:
The patent divides the illumination area into multiple zones with different illumination patterns. The first light illuminator projects light with a first illumination pattern that has different luminance in different regions (brighter near the roadside, dimmer toward the center), while the second light illuminator provides uniform illumination. This segmentation of illumination zones enhances pedestrian visibility on the roadside without requiring complete redesign of the entire lighting system.
Solution Approach 2:
The patent applies different illumination qualities to different spatial locations. The first illumination pattern creates a non-uniform light distribution with higher luminance near the roadside where pedestrians are likely to be, and lower luminance toward the road center. This local quality adjustment ensures that critical areas (roadside) receive enhanced illumination while maintaining overall visibility.
2Reliability
If the first light illuminator uses a complex illumination pattern to enhance pedestrian visibility, then overlooking of pedestrians is reduced, but the device complexity increases
Solution Approach 1:
The patent combines two light illuminators with different illumination patterns to achieve enhanced pedestrian visibility. The first light illuminator with the first illumination pattern (non-uniform) and the second light illuminator with the second illumination pattern (uniform) work together in a coordinated manner, merging their effects to provide both enhanced roadside visibility and overall road illumination without requiring a single complex illumination system.
Solution Approach 2:
The headlight device is designed to perform multiple functions simultaneously: the first light illuminator enhances pedestrian detection on the roadside while the second light illuminator maintains general road visibility. This multi-functionality allows the system to address both specific pedestrian safety concerns and overall driving visibility without requiring separate systems.
3Reliability
If illumination is focused on the roadside area to detect pedestrians, then pedestrian detection is improved, but the overall road illumination coverage is reduced
Solution Approach 1:
The patent segments the illumination task between two light illuminators. The first light illuminator is responsible for illuminating the roadside area with a non-uniform pattern to enhance pedestrian detection, while the second light illuminator covers the broader road area with uniform illumination. This segmentation allows both localized pedestrian detection and overall road coverage to be achieved simultaneously.
Solution Approach 2:
The patent merges the illumination coverage of two light illuminators to achieve both focused roadside illumination and broad road coverage. The first illumination pattern concentrates light near the roadside while the second illumination pattern provides uniform distribution across the road, and their combined effect ensures both pedestrian detection and overall visibility are maintained.
Data Source
AI summary
A headlight device for vehicle includes: a first light emission unit that illuminates a prescribed first light distribution area with light in a first illumination pattern in which bright areas and dark areas are alternately repeated; and a second light emission unit that illuminates a second light distribution area with light in a second illumination pattern in which the entire illuminated area is a bright area, wherein the first light distribution area has a portion that is beside the second light distribution area and does not overlap with the second light distribution area. In one aspect, the first illumination pattern is a grid pattern in which the bright areas in a grid shape are formed in the dark areas. In another aspect, the first illumination pattern is a stripe pattern in which the bright areas a1 and the dark areas are arranged in parallel.