Pixel Light Module Edge Homogeneity via Local Spacing
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Solution Overview
Problem
Current pixel light modules in motor vehicle headlights exhibit inhomogeneities in the edge regions of the light image due to uneven current distribution, leading to dark stripes and asymmetry between high beam and low beam distributions.
Innovation Solution
The vertical distance between light sources in the high beam row and the adjacent row is reduced in the edge areas compared to the central area, with light sources shifted towards the adjacent row, and the horizontal distance between adjacent light sources increases in edge regions, allowing for a more homogeneous light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged in a uniform grid pattern, then the structure is simple and manufacturing is easy, but inhomogeneities and dark stripes appear in the edge regions of the light image
Solution Approach 1:
The patent applies local quality by varying the vertical spacing between light sources in different regions of the array. Specifically, the vertical distance between adjacent light sources is reduced in edge regions compared to central regions. This creates a non-uniform arrangement that compensates for the lower light output at edges, achieving homogeneous light distribution across the entire image while maintaining manufacturing feasibility through a systematic spacing pattern.
2Manufacturing precision
If vertical distance between light sources in edge regions is reduced, then light distribution homogeneity improves, but light source density increases in edge areas
Solution Approach 1:
The invention implements local quality by applying different vertical spacing parameters to different spatial regions. The vertical distance between light sources is specifically reduced only in edge regions where inhomogeneities occur, while maintaining larger spacing in central regions. This targeted approach achieves homogeneous light distribution without uniformly increasing light source density across the entire array, thereby balancing optical performance with manufacturing considerations.
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 targeted positioning of light sources reduces inhomogeneities in the edge regions, achieving a more uniform and flexible light distribution that meets legal requirements and adaptive fade-out scenarios.
Implementation Method 1
each light guiding element has a light coupling surface for coupling in the light emitted by the respective light source and a light exit surface
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3~4
AI summary
The invention relates to a lighting device (20, 30) for a floodlamp, in particular a motor-vehicle headlamp, comprising a plurality of light sources (200, 300), which are arranged adjacent to each other in rows (201, 202, 203, 301, 302, 303) and which form a lighting field (209, 309), and comprising a light-guiding device (204, 304) having a plurality of light-guiding elements (201a, 202a, 203a, 301a, 302a, 303a), wherein each light-guiding element (201a, 202a, 203a, 301a, 302a, 303a) is associated with one light source (200, 300), wherein each light-guiding element (201a, 202a, 203a, 301a, 302a, 303a) has a light incoupling surface (201b, 202b, 203b, 301b, 302b, 303b) for coupling in light emitted by the particular light source and a light outlet surface, wherein the light-guiding elements (201a, 202a, 203a, 301a, 302a, 303a) are arranged in at least two linear rows (211, 212, 213, 311, 312, 313) arranged one over the other, and wherein the light-guiding elements (203a, 303a) of the lowest row (213, 313) are designed as high-beam light-guiding elements (201a, 301a) and form a high-beam row (213, 313), wherein the vertical distance between the light sources (200, 300) of the high-beam row (213, 313) and the light sources (200, 300) of the row (212, 312) arranged adjacent in the upward direction is smaller in at least one lateral edge region (208, 308) of the lighting field (209, 309) than in a central region (207, 307) of the lighting field (209, 309).