Light Emitting Device Optical Distance Adjustment Layer Film Thickness Control
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Solution Overview
Problem
Existing light emitting devices face challenges in improving light emission efficiency and color purity due to issues with the optical distance adjustment and conductive plug formation in resonator structures, which affect the film thickness and electrical connectivity of transparent conductive films.
Innovation Solution
A light emitting device design featuring a reflective layer, an optical distance adjustment layer, an insulating layer, and a conductive plug that extends through the optical distance adjustment layer to reach the reflective layer, allowing for precise electrical connection and maintaining the desired film thickness of the optical distance adjustment layer, thereby enhancing light emission efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive plug is formed by filling a contact hole with conductive material and polishing using CMP, then electrical connectivity between the reflection pattern and counter electrode is achieved, but the film thickness of the transparent conductive film may deviate from the appropriate thickness for implementing the resonator structure
Solution Approach 1:
The patent divides the conductive plug formation process into two separate steps: first forming the contact hole and filling it with conductive material, then performing a second polishing step after forming the optical distance adjustment layer. This segmentation allows the first polishing to ensure electrical connectivity while the second polishing to restore and precisely control the film thickness of the optical distance adjustment layer, thereby resolving the contradiction between achieving reliable electrical connectivity and maintaining precise film thickness control.
Solution Approach 2:
The patent performs a preliminary polishing step before forming the optical distance adjustment layer to ensure proper electrical connectivity. Then, after forming the optical distance adjustment layer, a second polishing step is performed to restore the film thickness to the appropriate value. This preliminary action followed by a corrective action allows both electrical connectivity and film thickness precision to be achieved.
2Manufacturing precision
If the film thickness of the transparent conductive film is adjusted to implement the resonator structure, then light emission efficiency and color purity are improved, but the electrical connectivity between the reflection pattern and counter electrode may be compromised
Solution Approach 1:
The patent segments the manufacturing process into distinct phases: first ensuring electrical connectivity through contact hole formation and filling, then restoring and precisely controlling film thickness through a second polishing step after optical distance adjustment layer formation. This segmentation allows each parameter (electrical connectivity and film thickness) to be optimized independently without compromising the other.
Solution Approach 2:
The patent introduces an intermediary step of forming the optical distance adjustment layer between the conductive plug formation and the final thickness adjustment. This intermediary layer allows the system to achieve both electrical connectivity (through the conductive plug) and precise film thickness control (through the optical distance adjustment layer and second polishing step), acting as a mediator that enables both requirements to be satisfied simultaneously.
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 proposed design improves light emission efficiency and color purity by maintaining the optical distance adjustment layer's film thickness and ensuring reliable electrical connectivity, leading to a high-definition light emitting device with enhanced performance.
Implementation Method 1
a reflective layer arranged between the light emitting layer and the main surface of the substrate and configured to reflect light generated by the light emitting layer
Implementation Method 2
a resonator structure that resonates and extracts emission light of each emission color to improve the light emission efficiency and the color purity
Data Source
AI summary
A light emitting device in which light emitting elements are arranged on a surface of a substrate is provided. Each of the light emitting elements comprises a light emitting layer, a reflective layer arranged between the light emitting layer and the surface, a first electrode arranged between the reflective layer and the light emitting layer, an optical distance adjustment layer arranged between the reflective layer and the first electrode, an insulating layer covering a peripheral portion of the first electrode and arranged, between two light emitting elements adjacent to each other, between the optical distance adjustment layer and the light emitting layer, and a conductive plug extending from the insulating layer to pass through the optical distance adjustment layer and reach a height of an upper surface of the reflective layer while being in electrical contact with the first electrode.