Adaptive Laser Headlamp Beam Shaping via Digital Micromirror Device
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Solution Overview
Problem
Conventional automotive headlamps require frequent maintenance and inefficiently utilize light due to reliance on mechanical systems and fixed illumination sources, often necessitating manual switching between high and low beams to avoid glare, which compromises illumination quality and safety.
Innovation Solution
A multiple laser illumination system with a phosphor down converter and digital micromirror device (DMD) that uses adaptive beam shaping by varying laser intensity and micromirror positions to efficiently direct light, allowing for automatic glare-free operation without mechanical parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional sealed beam lamps with mechanical swivel systems are used for beam steering, then the headlamp can be mechanically adjusted to follow vehicle motion, but the system requires frequent maintenance and has high repair costs due to motors and moving parts
Solution Approach 1:
The patent replaces the mechanical swivel system with a digital micromirror device (DMD) that uses electronically controlled micromirrors to steer light beams. This substitution eliminates motors and moving parts, thereby improving reliability and reducing maintenance requirements while maintaining beam steering capability
Solution Approach 2:
The patent introduces a DMD as an intermediary device between the light source and the environment. The DMD's micromirrors act as intermediaries to redirect light beams without requiring mechanical movement of the entire headlamp assembly, achieving beam steering through optical control rather than mechanical positioning
2Device complexity
If conventional illumination sources are used, then the headlamp structure is simple, but light utilization is inefficient and manual switching between high and low beams is required to avoid glare
Solution Approach 1:
The patent implements dynamic control of light beams by individually addressing micromirrors in the DMD. Each micromirror can be independently tilted to direct light to different locations, enabling adaptive beam shaping that responds to real-time driving conditions. This dynamic control eliminates the need for manual high/low beam switching and improves light utilization efficiency
Solution Approach 2:
The patent changes the operational parameters of the illumination system by using a laser source with a DMD controller that can precisely control the intensity and direction of light. The system varies the tilt angle of individual micromirrors and the intensity of laser illumination to optimize beam patterns, thereby improving light utilization efficiency without excessive structural complexity
3Illumination intensity
If high beam is used to maintain bright illumination, then the driver has good visibility, but oncoming drivers experience glare in their eyes
Solution Approach 1:
The patent applies local quality control by individually addressing and controlling specific micromirrors in the DMD. The controller can tilt only the micromirrors that would direct light toward oncoming traffic, while keeping other micromirrors positioned to maintain bright illumination for the driver. This localized control eliminates glare for oncoming drivers without compromising the driver's visibility
Solution Approach 2:
The patent segments the illumination beam into multiple controllable components by using an array of individually addressable micromirrors. Each micromirror represents a segment of the overall beam that can be independently controlled. This segmentation allows the system to direct different portions of the beam to different locations, enabling simultaneous high illumination for the driver and glare-free operation for oncoming traffic
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
The solution provides robust, reliable, and energy-efficient adaptive beam shaping, maintaining high brightness while avoiding glare for oncoming traffic, reducing maintenance needs and enhancing safety with automated beam adjustment.
Implementation Method 1
A down converter material emits light when illuminated by one or more of the laser illumination sources
Data Source
AI summary
An illumination system includes at least first and second laser illumination sources. A down converter material emits light when illuminated by one or more of the laser illumination sources. The first laser illumination source is arranged to illuminate only a first portion of the down converter material. The second laser illumination source is arranged to illuminate only a second portion of the down converter material. Control circuitry causes the first laser illumination source to adaptively vary a first intensity of illuminating the first portion of the down converter material, causes the second laser illumination source to adaptively vary a second intensity of illuminating the second portion of the down converter material, and causes the light modulator to allow a selected amount of the down converter material's emitted light to be projected from the system.