OLED Electrode Hole Structure for Stable Cathode Power Connection
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Solution Overview
Problem
Existing OLED display devices face challenges in efficiently connecting the cathode electrode and auxiliary electrode, leading to increased resistance and power consumption due to the lack of stable contact and proper alignment of the electron transport layer with the metal layer.
Innovation Solution
A display device structure featuring a metal layer made of molybdenum titanium, with a patterned anode electrode and an auxiliary electrode connected via laser irradiation, where the electron transport layer is formed to cover the auxiliary electrode and bank, and the bank exposes regions of the electrode hole, allowing for reflow and direct contact with the metal layer, reducing resistance and improving power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electron transport layer is formed to cover the auxiliary electrode and bank, then the connection between cathode and auxiliary electrodes is stabilized, but the manufacturing complexity increases due to multiple patterning steps
Solution Approach 1:
The auxiliary electrode is divided into multiple electrode holes that expose the metal layer, allowing the electron transport layer to be formed in a segmented manner that ensures stable contact while simplifying the overall manufacturing process
Solution Approach 2:
The bank is formed in advance to expose the central region of the auxiliary electrode and electrode holes before forming the electron transport layer, ensuring proper alignment and contact without requiring complex post-processing steps
2Use of energy by moving object
If laser irradiation is used to connect the metal layer and electron transport layer, then energy transfer efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The metal layer is selectively positioned at specific locations beneath the auxiliary electrode to serve as localized energy absorption points for laser irradiation, maximizing energy transfer efficiency while reducing the overall precision requirements across the entire structure
Solution Approach 2:
The metal layer acts as an intermediary between the laser energy and the electron transport layer, absorbing laser energy and transferring it to the electron transport layer through direct contact, thereby improving overall energy transfer efficiency
3Reliability
If the bank exposes regions of the electrode hole, then the electron transport layer can directly contact the metal layer, but the device structure becomes more complex
Solution Approach 1:
The bank is designed to expose specific regions of the electrode holes, extracting only the necessary contact areas to allow electron transport layer contact with the metal layer while maintaining overall structural simplicity
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 stabilizes the connection between the cathode and auxiliary electrodes, reduces power consumption, and enhances the operating characteristics of the OLED display device by maximizing laser absorptance and ensuring efficient energy transfer.
Implementation Method 1
irradiating a laser to the substrate after forming the cathode electrode
Implementation Method 2
The metal layer transfers energy caused by the laser to the electron transport layer
Implementation Method 3
the electron transport layer is melted by the energy and flows into the electrode hole
Data Source
AI summary
A display device can include a substrate having a light emitting area and a non-light emitting area; an anode electrode disposed in the light emitting area; a metal layer disposed in the non-light emitting area and connected to a first driving power; an auxiliary electrode disposed on the metal layer and including at least one electrode hole exposing the metal layer; a bank disposed on an edge region of the anode electrode and an edge region of the auxiliary electrode; a light emitting layer disposed on a region of the anode electrode exposed by the bank; an electron transport layer disposed on the light emitting layer and the auxiliary electrode; and a cathode electrode disposed on the electron transport layer, in which the electron transport layer is in direct contact with the metal layer through the at least one electrode hole.