Partial Beam Shaping Optical Element for Light Extraction Efficiency
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Solution Overview
Problem
Existing light generating systems face inefficiencies due to the étendue mismatch and aspect ratio issues, leading to suboptimal performance in applications like LCD systems, where higher efficiency and specific light distribution are desired.
Innovation Solution
A light generating system comprising an elongated luminescent body with a beam shaping optical element and a reflective surface, where the beam shaping optical element is partially intersected along a plane of symmetry, reducing étendue and improving optical efficiency by redirecting light back into the luminescent body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a complete beam shaping optical element is used, then light extraction efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The beam shaping optical element is segmented into a first portion and a second portion along a plane of symmetry. The first portion is optically coupled to the luminescent body while the second portion is removed, creating a partial beam shaping optical element. This segmentation reduces device complexity and manufacturing difficulty while maintaining essential light extraction functionality through the remaining first portion.
2Device complexity
If the beam shaping optical element is reduced to a partial element, then device complexity is reduced, but light extraction efficiency may deteriorate
Solution Approach 1:
A reflective surface is introduced as an intermediary element to redirect light that would otherwise be lost. The reflective surface is positioned to receive light from the luminescent body and redirect it through the first portion of the partial beam shaping optical element, thereby compensating for the removed second portion and maintaining light extraction efficiency.
3Loss of energy
If étendue is reduced for better optical efficiency, then optical efficiency is improved, but adaptability to different applications decreases
Solution Approach 1:
The system achieves dynamic adaptability by selectively applying the partial beam shaping optical element to specific portions of the luminescent body. The first portion of the beam shaping optical element can be configured with different geometries and orientations to match different application requirements, allowing the system to adapt to various étendue requirements while maintaining improved optical efficiency where applied.
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 configuration allows for adaptable étendue and aspect ratio adjustment, enhancing the optical efficiency and manufacturing simplicity, resulting in a high-brightness light source suitable for various applications.
Implementation Method 1
the elongated luminescent body comprising luminescent material configured to convert at least part of the light source light into luminescent material light
Implementation Method 2
the second face has a second face surface area; and wherein the second face has a second face surface area that is not (directly) optically coupled to the beam shaping optical element comprises a first reflecting element
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E
AI summary
A light generating system (1000) comprising a plurality of light sources (10) configured to provide light source light (11), an elongated luminescent body (100) having a first face (141) and a second face (142) defining a length (L) of the elongated luminescent body (100), the elongated luminescent body comprising one or more side faces (140), the elongated luminescent body (100) comprising a radiation input face (111) and the second face (142) comprising a first radiation exit window (112), wherein the radiation input face (111) is configured in a light receiving relationship with the plurality of light sources (10), wherein the elongated luminescent body (100) comprises luminescent material (120) configured to convert at least part of the light source light (11) into luminescent material light (8), and a beam shaping optical element (224).