Vehicle Headlight with Distinct S/P Ratio LED Zones
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Solution Overview
Problem
Conventional vehicle headlights do not effectively enhance peripheral vision awareness during nighttime driving, leading to difficulties in detecting objects in dark environments, particularly when turning or changing lanes, due to inadequate illumination of areas outside the direct light beam.
Innovation Solution
A vehicle headlight configuration featuring a light distribution pattern with distinct S/P ratios for central and peripheral areas, utilizing white LEDs with specific spectral distributions to optimize light projection, where LEDs with a higher S/P ratio (2.0 or more) illuminate peripheral areas to enhance peripheral vision awareness and those with a lower S/P ratio (1.5 or more) illuminate the central area to prevent glare, while also including intermediate and near-side areas for improved visibility of signs and road features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If headlights use high S/P ratio light sources to enhance peripheral vision awareness, then rod cells are stimulated more effectively, but glare may occur in the central vision area
Solution Approach 1:
The patent resolves this contradiction by assigning different spectral qualities to different spatial zones. The first LED with high S/P ratio (≥2.0) is positioned and configured to illuminate primarily the peripheral area, stimulating rod cells without causing central glare. The second LED with lower S/P ratio (≥1.5) illuminates the central area, providing adequate visibility without excessive blue light content that would cause glare. This spatial separation of spectral functions eliminates the harmful effect while preserving the beneficial effect
2Use of energy by moving object
If conventional headlights illuminate only the direct path ahead, then energy consumption is reduced, but objects in peripheral areas during turns or lane changes cannot be detected early
Solution Approach 1:
The patent applies segmentation by dividing the illumination task into distinct functional zones using multiple LEDs. The first LED segment is dedicated to illuminating the peripheral area with high S/P ratio light to enable early detection of objects during turns or lane changes. The second LED segment illuminates the central area with appropriate S/P ratio. This segmentation allows targeted illumination of peripheral areas without requiring excessive overall illuminance, thus managing energy consumption while improving detection time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables earlier and more accurate detection of objects and signs, reducing reaction time and missing-out rates, and enhances brightness perception without increasing overall illuminance, thereby improving safety during nighttime driving.
Implementation Method 1
The light source includes a plurality of white LEDs with respective light emission surfaces directed toward the projection lens
Data Source
AI summary
A vehicle headlight can facilitate an earlier awareness with peripheral vision under dark environment (such as during nighttime, tunnel, or adverse weather driving). The light source can include a plurality of white LEDs. The plurality of white LEDs include a first white LED and a second white LED. The first white LED has an S/P ratio, which is represented by (S(λ)*V′(λ))/(S(λ)*V(λ)) in which S(λ) is a spectrum of the first light source, V′(λ) is a relative luminosity factor in scotopic vision, and V(λ) is a relative luminosity factor in photopic vision, lower than that of the second white LED.