Motor Vehicle Headlight Lighting System with Dual-Luminance Light Sources
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Solution Overview
Problem
Existing motor vehicle lighting systems face inefficiencies and increased production costs due to the need for high luminance light sources to achieve ideal light intensity profiles, leading to oversizing and high contrast at the beam's lateral ends, which hinders vision and reduces system efficiency.
Innovation Solution
A lighting system utilizing two types of light sources with different luminances, where high luminance sources are used in areas requiring higher intensity and low luminance sources in areas requiring lower intensity, allowing for reduced power installation while maintaining the ideal intensity profile, and incorporating overlapping light spots for improved homogeneity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high luminance light sources are used to achieve ideal light intensity profile, then the light intensity requirement is met, but the system becomes oversized and production cost increases
Solution Approach 1:
The patent applies local quality by using different luminance light sources in different spatial zones of the headlight beam. High luminance sources are positioned in zones requiring higher intensity (central and upper regions), while low luminance sources are used in zones requiring lower intensity (lateral and lower regions). This zone-based differentiation allows the system to meet the ideal intensity profile without uniformly oversizing all light sources, thereby reducing production cost while maintaining illumination requirements.
2Illumination intensity
If high luminance light sources are used throughout the system, then the light intensity profile is met, but the system power installation becomes excessive
Solution Approach 1:
The patent implements local quality by matching light source luminance to the specific power requirements of different beam zones. High luminance sources are deployed only where high intensity is needed (central illumination zones), while low luminance sources are used in lateral and peripheral zones where lower intensity suffices. This spatially differentiated approach ensures the ideal intensity profile is achieved while minimizing total installed power across the entire lighting system.
3Illumination intensity
If uniform high luminance sources are used, then the intensity profile is satisfied, but high contrast at lateral ends hinders driver vision
Solution Approach 1:
The patent applies local quality by using low luminance light sources specifically in the lateral zones of the headlight beam where excessive contrast would harm driver vision. These lateral zones correspond to areas adjacent to oncoming traffic lanes. By reducing luminance in these specific regions while maintaining higher luminance in central zones, the system satisfies the intensity profile requirements without creating harmful high-contrast transitions that would impair driver visibility.
4Object-affected harmful factors
If light sources are powered below rated current to reduce contrast, then vision is improved, but system efficiency decreases
Solution Approach 1:
The patent resolves this contradiction by using low luminance light sources (operating at or near rated current) in lateral zones instead of using high luminance sources operated below rated current. This approach achieves the same contrast reduction effect but maintains higher system efficiency because the low luminance sources are designed to operate efficiently at their rated power, avoiding the inefficiencies associated with under-driving high luminance sources.
Data Source
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AI summary
The invention relates to a lighting system (2) for a motor vehicle, which is intended for emitting a light beam. The beam comprises at least two illuminated areas, each generated by at least one light source (6), and optical means (8) arranged such as to form a light spot from the light emitted by the light source (6), each spot being in the general shape of a rectangular strip of light. The system (2) also includes at least two types of light sources, referred to as first and second types of light source, the light sources (6) of the same type having substantially the same luminance. The luminance of a light source (6) of the first type is two to ten times higher than that of a light source (6) of the second type.