Light-emitting device uniform luminance segmentation
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Solution Overview
Problem
Existing light-emitting devices face challenges in achieving uniform frontal luminance and reducing color non-uniformity due to the design of light transmissive members, which affects the efficiency and effectiveness of light emission.
Innovation Solution
A light-emitting device design featuring a first light transmissive member with specific surface configurations and a second light transmissive member that covers part of the first lateral surface, combined with a light reflective member, to enhance light extraction and reflection, ensuring uniform luminance and reduced color non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light transmissive member is designed with a simple structure, then manufacturing is easier, but frontal luminance uniformity deteriorates
Solution Approach 1:
The light transmissive member is divided into multiple segments: a first light transmissive member covering the light-emitting element, a second light transmissive member covering the first lateral surface, and a light reflective member covering the second lateral surface. This segmentation allows each part to be optimized for specific functions while maintaining overall manufacturing simplicity.
Solution Approach 2:
Different regions of the light transmissive structure are assigned different optical properties. The first light transmissive member has a first refractive index, the second light transmissive member has a second refractive index, and the light reflective member has high reflectivity. This local differentiation of optical properties achieves uniform frontal luminance while keeping the overall structure manufacturable.
2Illumination intensity
If light reflective resin is applied to cover non-joined portions, then luminance is improved, but color non-uniformity increases
Solution Approach 1:
The patent applies different materials with different optical properties to different locations: the light reflective member is specifically positioned to cover the second lateral surface and non-joined portions, while the light transmissive members cover areas requiring light transmission. This localized application ensures high luminance from reflective areas without compromising color uniformity in transmissive areas.
Solution Approach 2:
The second light transmissive member acts as an intermediary between the first light transmissive member and the light reflective member. It has a refractive index between that of the first light transmissive member and the light reflective member, creating a gradual optical transition that reduces color non-uniformity while maintaining luminance enhancement.
3Ease of manufacture
If the peripheral lateral surface is expanded to a lower surface, then manufacturing is simplified, but light extraction efficiency deteriorates
Solution Approach 1:
Instead of expanding the entire peripheral lateral surface to a lower surface, the patent segments the structure into vertical first and second lateral surfaces at different heights. The first light transmissive member covers the light-emitting element at a higher level, while the second light transmissive member and light reflective member cover the first and second lateral surfaces respectively. This segmentation maintains light extraction efficiency by preserving vertical light paths while simplifying manufacturing through the stepped structure.
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 design achieves higher frontal luminance, reduced light emission non-uniformity, and improved manufacturing yields by optimizing the light extraction and reflection processes, while preventing adhesive leakage and ensuring efficient light guidance.
Implementation Method 1
a light reflective member disposed on the second light transmissive member, the second lateral surface of the first light transmissive member, and a lateral surface of the light-emitting element
Data Source
AI summary
A light-emitting device includes a light-emitting element; a first light transmissive member that is disposed over the light-emitting element and that includes a first upper surface, a lower surface, a first lateral surface; and a second lateral surface positioned outside the first lateral surface, a second light transmissive member that covers at least a part of the first lateral surface; and a light reflective member that is disposed on a lateral surface of the second light transmissive member, the second lateral surface of the first light transmissive member, and a lateral surface of the light-emitting element.