OLED Display Graphene Electrode Resistance Reduction
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Solution Overview
Problem
Conventional OLED display devices with ITO anode and cathode layers have high charge transfer resistance, impacting display effectiveness.
Innovation Solution
Incorporating a graphene layer as the uppermost layer on the package substrate and electrically connecting it with the anode or cathode layer on the array substrate via a conductive filler, reducing the resistance of these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO is used for anode and cathode layers, then the device structure is simple and easy to manufacture, but the charge transfer resistance is high which impacts display effectiveness
Solution Approach 1:
The patent uses composite material structure by combining ITO with graphene layer to create a hybrid conductive system. The ITO provides basic conductivity and transparency while the graphene layer adds low resistance properties, achieving both ease of manufacture (using conventional ITO deposition) and low charge transfer resistance (through graphene's superior electrical properties).
Solution Approach 2:
The patent changes the electrical conductivity parameter of the electrode by introducing graphene with exceptionally high electrical conductivity. This parameter change reduces the charge transfer resistance significantly while maintaining the overall manufacturing process simplicity through standard deposition techniques followed by graphene transfer or in-situ growth.
2Illumination intensity
If conventional ITO layers are used, then the manufacturing process is straightforward, but the voltage uniformity is poor leading to inferior light emission
Solution Approach 1:
The patent employs composite material approach by stacking ITO and graphene layers to create electrodes with superior electrical properties. The graphene layer compensates for ITO's high resistance, improving voltage uniformity across the electrode surface, which directly enhances light emission quality without requiring complete redesign of the manufacturing process.
Solution Approach 2:
The graphene layer acts as an intermediary between the ITO electrode and the organic electroluminescent layer. It provides a low-resistance interface that improves charge injection and distribution, thereby enhancing voltage uniformity and light emission quality while adding only one additional functional layer to the device structure.
3Reliability
If ITO layers with large charge transfer resistance are used, then the device structure remains simple, but the display effect is degraded
Solution Approach 1:
The patent implements composite electrode structure combining ITO and graphene where ITO provides structural integrity and transparency while graphene provides low resistance pathways for charge transport. This composite approach significantly improves display effectiveness by reducing charge transfer resistance while adding minimal structural complexity through a single additional layer.
Solution Approach 2:
The patent applies local quality improvement by adding graphene specifically at the electrode interfaces where charge transfer occurs. This targeted approach addresses the high resistance problem at critical interfaces without requiring modification of the entire device structure, thus improving display effectiveness with minimal added 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
This configuration improves the display effect by reducing the resistance and enhancing voltage uniformity, leading to better light emission and display performance.
Implementation Method 1
a conductive filler is provided between the array substrate and package substrate, the graphene layer is electrically connected with the anode layer or the cathode layer disposed as the upper most layer of the array substrate via the conductive filler
Data Source
AI summary
An OLED display device and a fabrication method thereof are provided. The OLED display device, includes: an array substrate and a package substrate cell-assembled, wherein, the array substrate includes a first base substrate, an anode layer, a cathode layer and an electroluminescent layer disposed between the anode layer and the cathode layer, the anode layer or the cathode layer is disposed as an upper most layer of the array substrate; the package substrate includes a second base substrate and a graphene layer, the graphene layer is disposed as an upper most layer of the package substrate; a conductive filler is provided between the array substrate and package substrate, the graphene layer is electrically connected with the anode layer or the cathode layer disposed as the upper most layer of the array substrate via the conductive filler.