OLED Display Electrode Power Supply Line Oxidation Prevention
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Solution Overview
Problem
The manufacturing process of organic light emitting display apparatuses often results in increased contact resistance due to oxidation of electrode power supply lines during the exposure process, leading to defects in the subsequently formed structures.
Innovation Solution
The use of an auxiliary conductive layer contacting the electrode power supply line, which is covered by an insulating layer, along with a terminal unit extending from the electrode power supply line towards the edge of the substrate, both formed of the same material, prevents galvanic phenomena and oxidation, thereby maintaining low resistance and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode power supply line is exposed during the manufacturing process to allow counter electrode contact, then the counter electrode can be formed to contact the electrode power supply line, but the surface of the electrode power supply line is oxidized during the exposing process, increasing contact resistance
Solution Approach 1:
An auxiliary conductive layer is introduced as an intermediary component between the electrode power supply line and the counter electrode. This auxiliary layer serves as a protective mediator that prevents direct oxidation of the electrode power supply line while still allowing the counter electrode to make contact, thus resolving the contradiction between ease of manufacturing and maintaining low contact resistance
Solution Approach 2:
The auxiliary conductive layer is formed in advance before the exposure process that would cause oxidation. This preliminary action protects the electrode power supply line surface from oxidation before the counter electrode contact is established, ensuring low contact resistance is maintained from the outset
2Productivity
If the electrode power supply line is exposed during manufacturing, then the counter electrode can contact it, but oxidation occurs leading to increased contact resistance and defects
Solution Approach 1:
The auxiliary conductive layer acts as a mediator that enables the manufacturing process to proceed without quality degradation. It allows the exposure and counter electrode formation steps to be performed while preventing oxidation, thus maintaining manufacturing precision despite the necessary exposure process
Solution Approach 2:
The auxiliary conductive layer serves as a sacrificial or temporary protective element that can be easily formed and removed or integrated into the final structure. This disposable-like approach protects the critical electrode power supply line during manufacturing without requiring complex protective measures
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 significantly increases the yield of organic light emitting display apparatuses by preventing corrosion and maintaining low contact resistance during the manufacturing process.
Implementation Method 1
both formed of the same material, prevents galvanic phenomena and oxidation
Implementation Method 2
prevents galvanic phenomena and oxidation, thereby maintaining low resistance
Data Source
AI summary
An organic light emitting display apparatus that can prevent corrosion during manufacturing is disclosed. The apparatus can have a remarkably enhanced yield. The apparatus includes: a substrate having a display area, a thin film transistor disposed inside the display area, an electrode power supply line disposed outside the display area, a pixel electrode disposed inside the display area of the substrate and electrically connected to the thin film transistor, an auxiliary conductive layer contacting the electrode power supply line at a side of the electrode power supply line, a pixel defining layer exposing the pixel electrode covering the auxiliary conductive layer and exposing the electrode power supply line. The apparatus also includes an intermediate layer disposed on the pixel electrode and comprising an emitting layer, and a counter electrode disposed on the intermediate layer and extending outside the display area of the substrate to contact the electrode power supply line.