OLED Second Electrode Contact Resistance Reduction
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Solution Overview
Problem
Conventional active matrix type organic electroluminescence devices experience high contact resistance between the second electrode and the electrode connecting terminal due to the use of electric charge transfer layers like lithium fluoride, calcium, or barium, leading to potential power supply issues and increased power consumption.
Innovation Solution
The introduction of an inorganic conductive intermediate layer, such as a transparent conductive oxide like ITO, IZO, or ZnO, directly connects the second electrode to the electrode connecting terminal, reducing contact resistance and improving power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric charge transfer layers (lithium fluoride, calcium, or barium) are used between the second electrode and the electrode connecting terminal, then electrical connection is established, but contact resistance becomes large leading to power supply issues and increased power consumption
Solution Approach 1:
The patent introduces an inorganic conductive intermediate layer as a mediator between the second electrode and the electrode connecting terminal. This intermediate layer is specifically designed to have low contact resistance properties, acting as an effective bridge that facilitates electrical connection while minimizing energy loss, thereby resolving the contradiction between establishing reliable electrical connection and reducing power consumption.
Solution Approach 2:
The patent changes the material parameter of the interface layer from conventional electric charge transfer layers (lithium fluoride, calcium, or barium) to an inorganic conductive material. This parameter change fundamentally alters the electrical properties at the interface, transforming it from a high-resistance connection to a low-resistance connection, thus simultaneously improving electrical connection reliability and reducing power consumption.
2Reliability
If electric charge transfer layers are used between the second electrode and the electrode connecting terminal, then electrical connection is established, but contact resistance increases causing power supply issues
Solution Approach 1:
The inorganic conductive intermediate layer serves as a specialized mediator that optimizes the electrical interface between the second electrode and the electrode connecting terminal. By selecting materials with appropriate conductive properties, this intermediate layer ensures stable power supply while minimizing resistance-related energy losses, directly addressing the contradiction between power supply stability and resistance-related power loss.
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 enhances the reliability and reduces power consumption of the active matrix type organic electroluminescence device by ensuring efficient electrical connection and minimizing resistance-related issues.
Implementation Method 1
The inorganic conductive intermediate layer may comprise an oxide layer. The oxide layer may be formed by a transparent conductive oxide. The transparent conductive oxide may comprise at least one of ITO, IZO, In2O3, and ZnO.
Implementation Method 2
an active matrix type organic electroluminescence device having a reduced contact resistance between an electrode and an electrode connecting terminal
Data Source
AI summary
An active matrix type organic electroluminescence device having a plurality of sub-pixels disposed on a substrate, wherein each of the sub-pixels includes a first thin film transistor driven by a driving circuit, a second thin film transistor driven by the first thin film transistor, and a display portion driven by the second thin film transistor; the display portion includes a first electrode to receive a first electric charge from the second thin film transistor, a second electrode to receive a second electric charge from a second electrode connecting terminal disposed outside of the sub-pixel, a light emitting layer interposed between the first electrode and the second electrode, and an electric charge transfoer layer interposed between the light emitting layer and at least one of the first and the second electrodes; and the second electrode and the second electrode connecting terminal are directly electrically connected.