Magnetic Particle Auxiliary Electrode for OLED Cathode Resistance
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Solution Overview
Problem
In organic light emitting display devices, the increase in cathode resistance due to thinner metal deposition leads to a trade-off between light emission efficiency and driving voltage, necessitating a method to reduce cathode resistance while maintaining efficiency.
Innovation Solution
The method involves forming an auxiliary electrode in a non-display area using a magnetic particle carried in an organic material, which is fixed and then removed using electromagnets, allowing direct contact between the first and second electrodes to reduce cathode resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the metal layer thickness is reduced to increase light emission efficiency, then light emission efficiency is improved, but cathode resistance increases
Solution Approach 1:
The cathode is divided into two separate layers: a thin metal layer for light emission and a separate auxiliary electrode for electrical connection. This segmentation allows the metal layer to be optimized for light transmission while the auxiliary electrode provides the necessary electrical conductivity, resolving the contradiction between light emission efficiency and cathode resistance.
Solution Approach 2:
A non-conductive layer is introduced between the thin metal layer and the auxiliary electrode. This intermediary layer allows the thin metal layer to maintain its light-emitting function while enabling the auxiliary electrode to provide electrical connection without directly contacting the metal, thus maintaining both low resistance and high light emission efficiency.
2Illumination intensity
If the metal layer thickness is reduced to improve light emission efficiency, then light emission efficiency is improved, but driving voltage increases
Solution Approach 1:
By segmenting the cathode structure into a thin metal layer and a separate auxiliary electrode connected through a non-conductive layer, the invention reduces the overall resistance of the cathode assembly. This lower resistance directly reduces the driving voltage required, while the thin metal layer maintains high light emission efficiency.
3Reliability
If direct contact between first and second electrodes is formed in non-display area, then cathode resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The auxiliary electrode and non-conductive layer are formed in advance in the non-display area before the final electrode assembly. This preliminary action simplifies the overall manufacturing process by pre-establishing the electrical connection path, reducing the complexity of subsequent assembly steps.
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 effectively reduces cathode resistance, enhancing light emission efficiency and enabling the production of larger-scale organic light emitting display devices with lower power consumption.
Implementation Method 1
fixing the magnetic particle to the first electrode using a first electromagnet
Implementation Method 2
removing the magnetic particle and the organic light emitting material formed on the magnetic particle using a second electromagnet provided at a distance from the magnetic particle
Data Source
AI summary
A method for manufacturing an organic light emitting display device that includes a gate electrode, a source electrode, and a drain electrode in a display area of a display substrate, and an organic light emitting display device, the method including forming an auxiliary electrode in a non-display area of the display substrate; forming a first electrode that is electrically connected with the drain electrode and the auxiliary electrode; providing a magnetic particle on the first electrode in the non-display area of the display substrate, the magnetic particle being carried in an organic material; fixing the magnetic particle to the first electrode using a first electromagnet; removing the organic material; forming an organic light emitting material on the first electrode and the magnetic particle; removing the magnetic particle and the organic light emitting material formed on the magnetic particle using a second electromagnet provided at a distance from the magnetic particle; and forming a second electrode on the first electrode and the organic light emitting material.