Light-Reflecting Resin Coating for LED Protection Element
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Solution Overview
Problem
Conventional light-emitting devices with protection elements suffer from light absorption, leading to reduced emission efficiency and complex production processes due to the placement and design of protection elements within the device.
Innovation Solution
A light-emitting device design featuring an insulating base with a light-emitting element and a protection element, covered by a light-reflecting member composed of a flexible transparent resin with fillers that reflect or scatter light, allowing for efficient light extraction and simplified production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection element is included in the light-emitting device, then the tolerance to reverse voltage and serge voltage is improved, but the amount of light emitted to the outside is reduced due to absorption and blocking by the protection element
Solution Approach 1:
A light-reflecting member is introduced as an intermediary component between the light-emitting element and the protection element. This mediator reflects light that would otherwise be absorbed by the protection element back toward the light extraction path, thereby maintaining both protection functionality and light emission efficiency
Solution Approach 2:
The protection element's inherent light-absorbing property, which is harmful to light emission, is converted into a beneficial arrangement by positioning it in a recess and using a light-reflecting member to redirect light. The harmful absorption is compensated by reflecting light back into the extraction path, turning the protective element's presence into a non-detrimental or even beneficial configuration
2Illumination intensity
If the protection element is positioned lower than the light-emitting element, then the light absorption is reduced, but the device structure becomes more complex requiring recesses or spacers
Solution Approach 1:
The light-reflecting member is integrated with the packaging resin or encapsulant that already surrounds the light-emitting element. By combining the light-reflecting function with the existing protective packaging material, the design achieves light management without adding separate complex structural components like dedicated recesses or spacers
Solution Approach 2:
The packaging resin serves multiple functions simultaneously: it protects the light-emitting element, provides structural support, and when containing light-reflecting fillers, also performs light reflection to improve light extraction. This multi-functionality eliminates the need for separate dedicated light-reflecting structures
3Illumination intensity
If a light-reflecting member is introduced to reflect light away from the protection element, then light emission efficiency is improved, but the device complexity increases
Solution Approach 1:
The optical properties of the packaging resin are changed by adding light-reflecting fillers with specific refractive indices and particle sizes. This parameter change enables the resin to reflect light effectively without requiring additional structural complexity, as the light-reflecting capability is achieved through material composition rather than geometric design
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 enhances light emission efficiency by reflecting light away from the protection element, reducing absorption and simplifying the production process, resulting in a cost-effective and efficient light-emitting device.
Implementation Method 1
a light-reflecting member which reflects light and which covers the protection element
Implementation Method 2
the filler reflecting or scattering the light
Data Source
AI summary
To provide a light emitting device easy to produce and extracting light to its outside with high efficiency, the light-emitting device 70 of the present invention includes an insulating base 10; a light-emitting element 1 mounted on a side of the base 10; and a protection element 2 mounted on the side and protecting the light-emitting element 1. The element 2 is covered with a light-reflecting filler-containing resin 5, which is prepared by causing a flexible silicone resin to contain, before being cured, light-reflecting or light-scattering fillers 5a having a particle diameter larger than the wavelength of light emitted by the element 1. This causes light emitted from the element 1 to be reflected by the resin 5, instead of being absorbed by the element 2, so that such light is released to the outside of the light-emitting device 70. This allows the device 70 to extract light to the outside with high efficiency, and also allows for easy formation of the resin 5 having a desired pattern and position.