Organic Light Emitting Display Auxiliary Electrode Pressure Connection
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Solution Overview
Problem
In organic light emitting display apparatuses, the high surface resistance of the cathode electrode leads to increased driving voltage and reduced long-range uniformity, causing degradation in display performance due to voltage drops across the electrode.
Innovation Solution
An auxiliary electrode is electrically connected to the cathode electrode via an embossing member on the upper substrate, which physically presses the organic layer to establish direct contact and reduce surface resistance, thereby reducing the driving voltage and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode electrode is used alone, then the device structure is simple, but the surface resistance is high leading to increased driving voltage and reduced uniformity
Solution Approach 1:
The cathode electrode system is segmented into two functional parts: a cathode electrode for light emission and an auxiliary electrode for electrical connection and resistance reduction. This segmentation allows each electrode to specialize in its function, with the auxiliary electrode providing additional electrical pathways to reduce overall surface resistance and improve uniformity across the display.
Solution Approach 2:
The organic functional layer serves as an intermediary medium that enables electrical connection between the auxiliary electrode and the cathode electrode. By allowing the auxiliary electrode to contact the cathode electrode through this intermediate layer, the system achieves lower resistance without requiring direct metal-to-metal contact, thus maintaining the integrity of the cathode electrode structure.
2Power
If an auxiliary electrode is added to reduce surface resistance, then driving voltage and power consumption are reduced, but the device structure becomes more complex
Solution Approach 1:
The auxiliary electrode is designed to serve multiple functions: it provides electrical connection to reduce surface resistance, acts as an additional electron injection pathway, and maintains a simple planar structure that integrates seamlessly with the existing device architecture. This multi-functionality justifies the added structural element by delivering multiple benefits from a single component.
Solution Approach 2:
The invention changes the electrical parameters of the system by introducing the auxiliary electrode, which alters the resistance distribution and voltage characteristics. By adjusting the position, size, and electrical properties of the auxiliary electrode, the system optimizes power consumption and uniformity without fundamentally changing the overall device structure.
3Reliability
If the auxiliary electrode directly contacts the cathode electrode, then electrical connection is improved, but the organic functional layer integrity is compromised
Solution Approach 1:
The organic functional layer acts as an intermediary that enables electrical connection between the auxiliary electrode and cathode electrode without requiring physical breaching or direct contact. This intermediate layer maintains the integrity of the organic structure while providing the necessary electrical pathway, thus preserving both connection reliability and layer stability.
Solution Approach 2:
The invention replaces the mechanical contact-based electrical connection (direct electrode-to-electrode contact) with a field-based connection through the organic functional layer. This substitution eliminates the need for physical penetration or direct contact, thereby maintaining organic layer integrity while achieving reliable electrical connection through electronic coupling.
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 reduces the driving voltage and power consumption while enhancing the uniformity and resolution of the display by ensuring electrical connection between the auxiliary and cathode electrodes, suitable for large-sized substrates and mass production.
Implementation Method 1
The embossing member may directly contact the auxiliary electrode, to apply a pressure to cause the auxiliary electrode to electrically connect to the second electrode
Data Source
AI summary
An organic light emitting display apparatus includes a lower substrate and an upper substrate. The lower substrate includes a light emitting device having an organic emission layer between first and second electrodes, and an auxiliary electrode under and electrically connected to the second electrode. The upper substrate includes an embossing member contacting the second electrode. The embossing member is coupled to the upper substrate to face the lower substrate and applies a pressure to establish an electrical connection between the auxiliary electrode and the second electrode.