Light Emitting Device Lens Shape Insulating Filler Reflection
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Solution Overview
Problem
Existing light emitting devices face challenges in achieving high light extraction efficiency due to light absorption by base members and conductive members, with previous solutions either failing to effectively reflect light or compromising moldability and resin spreadability.
Innovation Solution
A light emitting device featuring a translucent member with a lens shape and an insulating filler coating the conductive members to reflect and extract light efficiently, eliminating the need for high reflective materials and improving light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a high reflective film is molded and adhered to the base member to increase light extraction efficiency, then light reflection is improved, but it is difficult to coat the vicinity of the light emitting device without mismatching and the area where light reflection is to be maximized
Solution Approach 1:
The patent extracts the reflective function from a separate adhered film and integrates it into the base member itself by forming a reflective layer within the resin material. This eliminates the need for separate film adhesion processes and allows the reflective property to be uniformly distributed throughout the base member, solving the coating mismatching problem while maintaining high light extraction efficiency.
Solution Approach 2:
The patent merges the base member structure with the reflective layer by incorporating light reflective filler into the resin material that forms the base member. This combination creates a unified structure where the base member inherently possesses reflective properties, eliminating the need for separate reflective films and simplifying the manufacturing process.
2Loss of energy
If an additive amount of high reflective powder material to be contained in resin is increased to improve light reflection, then light extraction efficiency is improved, but a moldability of the resin decreases
Solution Approach 1:
The patent optimizes the particle size, shape, and distribution parameters of the light reflective filler to achieve high reflectivity while maintaining resin moldability. By carefully controlling these parameters, the resin can be properly molded and spread while still containing sufficient reflective material to effectively reduce light absorption loss and improve light extraction efficiency.
3Ease of manufacture
If a reflection layer is formed by filling resin containing light reflective filler with sufficient amount to allow coating and spread, then resin can be coated and spread, but the resin can not reflect the light and an absorption amount of the light by the base member is not small, resulting in insufficient light extraction efficiency
Solution Approach 1:
The patent creates a composite resin material that combines the resin matrix with light reflective filler in optimized proportions and distributions. This composite structure allows the resin to maintain its coating and spreading properties while the embedded reflective filler particles provide effective light reflection, simultaneously achieving good manufacturability and high light extraction efficiency without the trade-offs of previous approaches.
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 extraction efficiency by reflecting and extracting absorbed light, preventing degradation and corrosion effects on conductive members, and maintaining stability and reliability.
Implementation Method 1
a light emitting device featuring a translucent member with a lens shape and an insulating filler coating the conductive members to reflect and extract light efficiently
Implementation Method 2
an insulating filler coating the conductive members to reflect and extract light efficiently
Implementation Method 3
a translucent member with a lens shape
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
A light emitting device which includes: a base body; a conductive member disposed on the base body; a light emitting element placed on the conductive member; and a translucent member disposed above the light emitting element. A surface of the translucent member is formed in a lens shape, and when a portion formed in the lens shape of the translucent member on a surface of the conductive member is perspectively seen from above, an area other than a portion where the light emitting element is placed is coated with an insulating filler to form a light reflection layer.