Pixelated Headlamp Light Module Masking Stray Reflections
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Solution Overview
Problem
Existing motor vehicle projector systems suffer from stray reflections that degrade the quality of projected images due to the presence of stray light rays from electrical connections and optical device reflections.
Innovation Solution
A light module with a mask positioned between the light-emitting device and optical device to absorb stray light rays, using an anti-reflective surface with a reflectance of less than 25% and made of conductive material, and a cooling plate to manage heat, ensuring the light source and printed circuit board are at the same height for optimal electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional headlamp with separate reflectors for low beam and high beam is used, then the illumination requirements for different driving conditions are met, but the device complexity and the number of components increase
Solution Approach 1:
The patent combines the low beam reflector and high beam reflector into a single shared reflector structure. The reflector has a first reflection area for low beam light and a second reflection area for high beam light, eliminating the need for separate reflectors while maintaining distinct illumination functions for different driving conditions.
Solution Approach 2:
The shared reflector serves multiple functions by providing both low beam illumination and high beam illumination through different reflection areas. This multi-functional design allows one component to replace what would traditionally require two separate components, reducing overall system complexity.
2Reliability
If a conventional headlamp with separate reflectors is used, then beam separation is achieved, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent merges multiple reflector functions into a single integrated reflector component with distinct reflection areas. This reduces the number of parts that need to be manufactured and assembled, lowering manufacturing costs and assembly complexity while maintaining reliable beam separation through the different reflection areas.
3Illumination intensity
If a conventional headlamp with separate reflectors is used, then optical performance is maintained, but the overall headlamp size increases
Solution Approach 1:
The patent combines multiple reflector functions into a single shared reflector structure, reducing the overall volume required for the headlamp assembly. The integrated design eliminates the space that would be occupied by separate reflector components while maintaining the optical performance needed for both low beam and high beam illumination.
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 enhances image sharpness and reduces noise by minimizing stray light interference, resulting in a clearer projected image with improved optical quality.
Implementation Method 1
a light module for a motor vehicle headlamp with a light source in the form of an LED module
Implementation Method 2
a common reflector for both the low beam and the high beam
Data Source
Figure 1
Figure 2~3A
Figure 3B
AI summary
A light module (100) for a motor vehicle headlamp characterised in that it comprises: - at least one pixelated light source (3) comprising a plurality of electroluminescent emitters distributed into a plurality of pixels and capable of emitting light rays; - a projection lens (10) arranged to directly image, towards the outside of the light module (100), a light beam formed by the light rays emitted by the at least one light source (3), and characterised in that it comprises - a mask (2) arranged between the at least one light source (3) and the projection lens (10) in order to completely or partially prevent light rays originating from the light source from being reflected by zones arranged outside the plurality of electroluminescent emitters of the light source.