AMOLED Cathode Conductivity via Auxiliary Electrode Spacer
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Solution Overview
Problem
The conductivity of the cathode in top-emitting AMOLED devices is insufficient, and existing methods to enhance conductivity, such as using a photo spacer, risk breaking and are ineffective.
Innovation Solution
An electroluminescent device with a main spacer and a first spacer, where the first spacer has an uneven surface and an auxiliary electrode layer in contact with the first electrode, enhancing conductivity while preventing damage from pressure through a compressible main spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photo spacer is used to enhance cathode conductivity, then the conductivity is improved, but the spacer is at risk of breaking and becomes ineffective
Solution Approach 1:
The invention divides the single spacer structure into two distinct components: a main spacer that provides mechanical support and spacing, and a first spacer that carries the auxiliary electrode layer for conductivity enhancement. This segmentation allows each component to specialize in its function, preventing the conductivity-enhancing spacer from bearing mechanical loads that could cause breaking.
Solution Approach 2:
The main spacer acts as an intermediary between the first substrate and second substrate, absorbing mechanical stresses and protecting the first spacer with the auxiliary electrode layer from direct pressure. This mediator approach allows the conductivity-enhancing component to function without being subjected to forces that would cause failure.
2Stability of the object's composition
If pressure is applied to compress the device, then the device structure is stabilized, but the spacer may break and lose effectiveness
Solution Approach 1:
The main spacer is designed with compressible properties to absorb and distribute applied pressure before it reaches the first spacer. This beforehand cushioning protects the first spacer and its auxiliary electrode layer from pressure-induced damage, ensuring continued functionality under compression.
Solution Approach 2:
The invention changes the mechanical parameters of the spacer system by using different material properties for the main spacer (more compliant, compressible) versus the first spacer (maintains structural integrity). This parameter differentiation allows the system to withstand compression while protecting the conductivity-enhancing component.
3Reliability
If the cathode conductivity is increased, then the device performance is improved, but the device complexity increases
Solution Approach 1:
The first spacer serves multiple functions: it provides spacing between substrates, supports the auxiliary electrode layer for conductivity enhancement, and positions the electrode layer for optimal electrical connection. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The invention merges the spacing function and the conductivity enhancement function into an integrated first spacer structure that carries the auxiliary electrode layer. By combining these functions in one component rather than using separate elements, the design minimizes the increase in overall device complexity.
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 effectively increases the conductivity of the cathode without risking the spacer's integrity, ensuring stable electrical connection and improved device performance.
Implementation Method 1
the main spacer is made of an elastic material and the main spacer is compressible in a direction perpendicular to the first substrate and the second substrate
Implementation Method 2
at least part of the auxiliary electrode layer is in contact with the first electrode for electrical connection
Data Source
AI summary
The present disclosure provides an electroluminescent device, a method for manufacturing the same, and a display device. The electroluminescent device of the present disclosure includes: a first substrate and a second substrate disposed opposite to each other; a first electrode disposed on a side of the first substrate proximal to the second substrate; a main spacer disposed between the first substrate and the second substrate and configured to support the first substrate and the second substrate; a first spacer spaced apart from the main spacer disposed on the side of the second substrate proximal to the first substrate; and an auxiliary electrode layer disposed on at least part of an surface of the first spacer proximal to the first substrate, wherein at least part of the auxiliary electrode layer is in contact with the first electrode for electrical connection.