Dual-Layer Reflective Light Guide for Planar Light Source Efficiency
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Solution Overview
Problem
Current light emitting modules in planar light sources face challenges in achieving high light extraction efficiency due to limitations in the design of light guide members and reflective elements, leading to uneven brightness and reduced light transmission.
Innovation Solution
The integration of a light emitting module comprising a light source, a light guide member, a first light reflective member with a higher refractive index, and a second light reflective member with a lower refractive index, arranged to optimize light transmission and reduce escape towards the lower region, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional light guide member with single reflective member is used, then the structure is simple, but light extraction efficiency is low and brightness is uneven
Solution Approach 1:
The reflective member is divided into two distinct layers: a first reflective member with high refractive index and a second reflective member with low refractive index. This segmentation allows each layer to perform different optical functions, improving overall light extraction efficiency while managing structural complexity
Solution Approach 2:
The patent uses composite material structure by combining two reflective members with different refractive indices. The first reflective member (high refractive index) and second reflective member (low refractive index) work together as a composite system to enhance light extraction efficiency beyond what a single material could achieve
2Productivity
If light guide member transmits light efficiently, then light transmission is high, but light escapes towards lower region reducing extraction efficiency
Solution Approach 1:
The patent changes the refractive index parameter by using two reflective members with different refractive indices. The first reflective member has high refractive index to capture and redirect light, while the second has low refractive index to allow controlled extraction, optimizing the balance between light transmission and preventing unwanted escape
3Device complexity
If single reflective member is used, then device complexity is low, but brightness uniformity is poor
Solution Approach 1:
The patent applies local quality by giving different refractive index characteristics to different layers of the reflective member. The first reflective member (high refractive index) and second reflective member (low refractive index) have locally optimized properties that together achieve uniform brightness distribution across the light guide member
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 significantly improves light extraction efficiency and reduces brightness unevenness by effectively guiding and reflecting light within the module, resulting in a more uniform and enhanced light output.
Implementation Method 1
The first light reflective member includes a first resin, and a first reflective body having a refractive index higher than a refractive index of the first resin
Implementation Method 2
The first light reflective member is arranged on a lower surface side of the light guide member
Implementation Method 3
The second light reflective member includes a second resin, and a second reflective body having a refractive index lower than a refractive index of the second resin
Implementation Method 4
The second light reflective member is arranged on a lower surface side of the first light reflective member
Data Source
AI summary
A light emitting module includes a light source, a light guide member, and first and second light reflective members. The light guide member is configured to transmit light from the light source. The light guide member having an upper surface and a lower surface opposite to the upper surface. The first light reflective member is arranged on a lower surface side of the light guide member. The first light reflective member has a lower surface. The first light reflective member includes a first resin, and a first reflective body having a refractive index higher than a refractive index of the first resin. The second light reflective member is arranged on a lower surface side of the first light reflective member. The second light reflective member includes a second resin, and a second reflective body having a refractive index lower than a refractive index of the second resin.