Phosphor Surface Illumination for Adaptive Headlight Efficiency
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Solution Overview
Problem
Existing lighting systems for adaptive frontlighting, such as matrix LED headlights, require maintaining maximum brightness across all pixels, leading to unnecessary light power being kept available but not utilized, resulting in inefficiency and excess power consumption.
Innovation Solution
A method and device that direct a primary light beam only onto a targeted partial surface of a phosphor surface, illuminating specific regions more intensely than uniform illumination, allowing for longer and more intense illumination of the intended areas within the same image set-up time, thereby reducing the need for higher-intensity lasers and optimizing light power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform illumination is applied to the entire phosphor surface, then maximum brightness can be maintained across all pixels, but light power is wasted on unilluminated regions
Solution Approach 1:
The phosphor surface is divided into multiple pixels or regions that can be independently illuminated. The deflection unit directs the primary light beam to specific pixels based on the desired light emission pattern, allowing selective illumination of only those regions that need to be bright, rather than uniformly illuminating the entire surface.
Solution Approach 2:
Different regions of the phosphor surface are treated differently in terms of illumination intensity and duration. The system applies higher illumination intensity and longer illumination duration to pixels that require maximum brightness, while reducing or eliminating illumination to pixels that do not need to be bright in the current light emission pattern.
2Power
If the light source operates in continuous mode to illuminate the entire phosphor surface, then maximum light power is available, but unnecessary light power is consumed when only partial illumination is needed
Solution Approach 1:
The illumination system transitions from static continuous operation to dynamic selective operation. The deflection unit dynamically directs the light beam to different pixels based on the required light emission pattern, and the light source operates in pulses synchronized with the deflection unit, activating light power only when and where it is needed.
Solution Approach 2:
The light source operates in a periodic pulsed manner rather than continuously. Each pulse corresponds to a specific illumination period for a particular pixel or region, allowing the system to cycle through different illumination patterns efficiently, activating light power only during the necessary illumination periods.
3Power
If a single high-power laser is used to illuminate the entire phosphor surface uniformly, then sufficient light power is available for all pixels, but the system cannot optimize light power usage for partial illumination
Solution Approach 1:
The illumination process is segmented into multiple time intervals and spatial regions. The deflection unit divides the illumination task by directing the light beam to different pixels in sequence, allowing the system to allocate light power efficiently to only the pixels that need illumination at any given time, rather than requiring the laser to be continuously at full power for the entire surface.
Solution Approach 2:
The system maintains continuous useful action by ensuring that the light beam is always directed to a useful target (illuminated pixel) rather than wasting time moving between unrelated regions. The deflection unit and light source are coordinated to maintain continuous illumination of the currently needed region, maximizing light power utilization efficiency.
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 approach enables a more efficient use of light power, allowing for a brighter light emission pattern with potentially up to 90-98% of the maximum achievable total light power, while reducing unnecessary light power consumption and enabling dynamic adjustments to light emission patterns without additional apparatus.
Implementation Method 1
the phosphor surface is designed, at a focal spot of a primary light beam, at least partly to convert the associated primary light into secondary light having a different wavelength
Data Source
AI summary
A method for generating a light emission pattern by illuminating at least one phosphor surface by at least one primary light beam is provided. The method includes: directing the primary light beam only onto a partial surface of the entire illuminatable phosphor surface; and illuminating at least one partial region of said partial surface more intensely than in the case of uniform illumination of the illuminatable phosphor surface.