Composite Cathode Structure for AMOLED Light Transmittance and Conductivity
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Solution Overview
Problem
Traditional cathode materials in top-emitting AMOLED displays face challenges in balancing light transmittance and conductivity, leading to potential breakage and increased power consumption due to thin thickness, and uneven brightness.
Innovation Solution
A method involving a conductive layer and protection layer formed simultaneously on the cathode, with the conductive layer in contact and embedded within the protection layer, ensuring reduced resistance and preventing breakage while maintaining light transmittance, using oxidation processes to control thickness and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cathode thickness is reduced to improve light transmittance, then light transmittance is improved, but the cathode becomes prone to breakage and conductivity decreases
Solution Approach 1:
The patent employs a composite cathode structure consisting of multiple layers including a reflective layer, a conductive layer, and an encapsulation layer. This composite structure allows the cathode to maintain thin overall thickness for light transmittance while the combined layers provide mechanical strength and electrical conductivity that prevents breakage and ensures reliable operation
2Illumination intensity
If the cathode thickness is reduced to improve light transmittance, then light transmittance is improved, but power consumption increases
Solution Approach 1:
The multi-layer composite cathode structure optimizes the balance between light transmittance and electrical conductivity. The conductive layer within the composite is designed with appropriate thickness and material properties to maintain low electrical resistance, thereby reducing power consumption while the overall thin structure ensures high light transmittance
3Reliability
If traditional cathode materials are used to maintain conductivity, then conductivity is maintained, but light transmittance decreases and manufacturing complexity increases
Solution Approach 1:
The cathode is segmented into multiple functional layers, each with specific thickness and material properties optimized for its function. The conductive layer is separated from the reflective and encapsulation layers, allowing independent optimization of conductivity and light transmittance properties without requiring complex traditional materials
4Ease of manufacture
If the cathode structure is simplified to reduce manufacturing steps, then manufacturing complexity is reduced, but conductivity and breakage resistance deteriorate
Solution Approach 1:
The patent merges multiple functions into the cathode structure by integrating the reflective layer, conductive layer, and encapsulation layer into a unified multi-layer component. This merging approach maintains the necessary conductivity and mechanical strength while streamlining the manufacturing process compared to using separate traditional cathode materials and additional protective components
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
This approach enhances the conductivity of the cathode while maintaining good light transmittance, improving display uniformity and reducing power consumption without increasing manufacturing steps, and does not affect the aperture ratio or surface height.
Implementation Method 1
performing an oxidation process on the conductive film to form a conductive layer and a protection layer
Data Source
AI summary
An organic electroluminescent display panel includes: a first electrode, a pixel defining layer, an organic light emitting functional layer and a second electrode provided on a substrate; a conductive layer and a protection layer provided at a side of the second electrode away from the substrate, the conductive layer and the protection layer being provided in a single layer, a surface of the protection layer away from the substrate being parallel to that of the second electrode away from the substrate, the conductive layer being provided between the protection layer and the second electrode and in contact with the second electrode, the protection layer including a first portion provided in the pixel regions and a second portion provided on the conductive layer, and a sum of a thickness of the second portion and a thickness of the conductive layer being approximately equal to a thickness of the first portion.