Light Emitting Device with Reflective Conductive Members
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Solution Overview
Problem
The increase in the number of layers in light emitting devices hinders the reduction in thickness, while existing technologies struggle to enhance light extraction efficiency.
Innovation Solution
A light emitting device design featuring a substrate with spaced-apart conductive members and electrode layers, where the conductive members have higher reflectance than the electrode layers, allowing for a smaller thickness and improved light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal film with high reflectance is provided on the upper surface of the wirings to increase light-reflectivity, then light extraction efficiency is improved, but the number of layers increases and thickness reduction is hindered
Solution Approach 1:
The patent extracts the light-reflecting function from a separate metal film layer and integrates it into the wiring structure itself. The wiring is designed with a reflective portion that directly reflects light without requiring an additional metal film layer, thus maintaining high light extraction efficiency while reducing the number of layers in the device structure.
Solution Approach 2:
The wiring is designed to serve multiple functions: electrical conduction and light reflection. By making the wiring itself have light-reflecting properties through its specific structure (reflective portion), it eliminates the need for a separate metal film layer, achieving multi-functionality and reducing device complexity.
2Length of stationary object
If the number of layers is reduced to achieve thinner device thickness, then thickness is reduced, but light extraction efficiency may be compromised
Solution Approach 1:
The wiring structure incorporates a specific reflective portion with enhanced light-reflecting properties at the location where light extraction is needed. This local enhancement of reflective quality allows the wiring to compensate for the reduced number of layers and maintain high light extraction efficiency even in a thinner device 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 a compact light emitting device with high light extraction efficiency by using conductive members with higher reflectance than the electrode layers, optimizing both thickness and light emission.
Implementation Method 1
The first conductive member and the second conductive member have a first reflectance to light emitted from the light emitting element higher than a second reflectance of the first electrode layer and the second electrode layer
Data Source
AI summary
A light emitting device includes: first and second conductive members disposed on an upper surface of a substrate; and a light emitting element disposed above a portion of an upper surface of a first electrode layer and a portion of an upper surface of a second electrode layer, above the spacer region. The upper surface of the first electrode layer and the upper surface of the second electrode layer above spacer region are located lower than the upper surface of the first electrode layer above the first conductive member and the upper surface of the second electrode layer above the second conductive member, and a reflectance of the first conductive member and the second to light emitted from the light emitting element is higher than reflectance of the first electrode layer and the second electrode layer to light emitted from the light emitting element.