Light Guiding Element Refraction for Luminance and Color Stability
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Solution Overview
Problem
Existing light emission assemblies face inefficiencies in luminance and color predictability due to large air gaps and alignment issues, leading to light loss and color shift, particularly in automotive adaptive drive beam systems.
Innovation Solution
Incorporating a light guiding element with a small air gap between the beam shaping structure and the light emitting structure, which refracts and redirects light to minimize losses and maintain color consistency, using materials like silicone for temperature stability and mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large air gap is used between beam shaping structure and light source, then alignment tolerance is improved, but luminance decreases due to light loss
Solution Approach 1:
The optical system is segmented into three distinct components: light source, beam shaping structure, and light guiding element. This segmentation allows each component to be optimized independently - the light guiding element can be positioned close to the light source for high luminance while the beam shaping structure maintains alignment tolerance through its own positioning geometry.
Solution Approach 2:
The light guiding element acts as an intermediary between the light source and beam shaping structure. It captures light that would otherwise be lost in a large air gap and redirects it toward the beam shaping structure, effectively mediating the optical path between the two components.
2Illumination intensity
If beam shaping structure is placed close to light source, then luminance increases, but color shift occurs due to increased light extraction
Solution Approach 1:
The light guiding element serves as an intermediary that modifies the optical path between light source and beam shaping structure. By controlling how light enters the beam shaping structure through this intermediary element, the system achieves close proximity for high luminance while maintaining color consistency through controlled light extraction.
Solution Approach 2:
The light guiding element creates local variations in light extraction and redirection. Different regions of the light guiding element handle light differently - some areas capture stray light while others allow direct transmission - enabling simultaneous optimization of luminance and color consistency through spatially differentiated optical properties.
3Productivity
If light is redirected to enter beam shaping structure at large angles, then light utilization is improved, but alignment precision requirements increase
Solution Approach 1:
The system segments the angular redirection function from the alignment-critical beam shaping structure. The light guiding element handles angular redirection of stray light at various angles, while the beam shaping structure maintains a simpler, more tolerant alignment geometry. This segmentation allows high light utilization without proportionally increasing alignment precision requirements.
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 achieves a 15-20% increase in luminance and maintains predictable color emission by refracting lost light into the beam shaping structure, while maintaining mechanical stability and avoiding color shifts, even under high operating temperatures.
Implementation Method 1
at least one light guiding element (40) arranged between the beam shaping structure (20) and the light emitting structure (10) being suitable to refract at least a part of light (L2)
Implementation Method 2
using materials like silicone for temperature stability and mechanical robustness
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4(a)~4(c)
AI summary
The invention describes a light emitting assembly (100) comprising: • - a light emitting structure (10) with a first light emission surface (11) comprising one or more point-like light sources, preferably light-emitting diodes, to emit light (L) from the first light emission surface (11); • - a transparent beam shaping structure (20) comprising a second light emission surface (21) and a second light receiving surface (22) opposite to the second light emission surface (21), wherein the second light receiving surface (22) is arranged at a distance (D), preferably of 20 - 30 μm, above the first light emission surface (11) in order to create an air gap (30) between the first light emission surface (11) and the second light receiving surface (22) to receive light (LI) emitted from the light emitting structure (10) within an acceptance angle δ for the beam shaping structure (20) to shape a resulting beam of light (LI) being emitted through the second light emission surface (22); and • - one or more transparent light guiding elements (40) arranged between the beam shaping structure (20) and the light emitting structure (10) being suitably shaped to refract at least a part of light (L2) which is emitted from the first light emission surface (11) under an emergent angle ε larger than the acceptance angle δ towards the beam shaping structure (20). The invention further describes a vehicle light assembly (200) or vehicle front light (300) assembly comprising the light emitting assembly (100).