Organic Light Emitting Display Signal Pad Corrosion Protection
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Solution Overview
Problem
Top emission type organic light emitting display devices face corrosion issues with pad electrodes due to exposure to external environments, as they are manufactured from metal materials with good reflectance but poor corrosion resistance.
Innovation Solution
The device incorporates a signal pad structure with a passivation layer covering its lateral surface and a contact hole for exposing the upper surface, featuring a lower, central, and upper signal pad configuration to prevent corrosion, along with auxiliary electrodes to reduce resistance and enhance corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pad electrode is formed of metal material with good reflectance (e.g., silver), then the light reflection performance is improved, but the corrosion resistance deteriorates due to exposure to external environment
Solution Approach 1:
The patent introduces an auxiliary electrode as an intermediary component between the pad electrode and the external environment. This auxiliary electrode serves as a protective barrier that prevents direct exposure of the pad electrode to corrosive external factors while maintaining the electrical and optical functionality of the device.
Solution Approach 2:
The patent employs a bank structure that acts as a protective shell or film covering the lateral surface of the pad electrode. This bank structure physically isolates the vulnerable metal pad electrode from environmental factors such as moisture and oxygen, thereby preventing corrosion while allowing the pad electrode to maintain its light reflection properties.
2Illumination intensity
If the cathode electrode is formed of transparent conductive material to allow light emission, then the light transmission is improved, but the resistance increases
Solution Approach 1:
The patent utilizes composite material structure for the cathode electrode system, combining transparent conductive materials with auxiliary electrodes. This composite approach allows the cathode to maintain transparency for light emission while the auxiliary electrode provides additional conductive pathways to reduce overall resistance.
Solution Approach 2:
The auxiliary electrode serves multiple functions simultaneously: it acts as an additional conductive path to reduce resistance, provides mechanical support, and serves as a protective barrier. This multi-functionality allows the system to address both the light transmission and resistance issues without requiring separate dedicated components.
Data Source
AI summary
A method of manufacturing an organic light emitting display device can include providing a source electrode, a drain electrode and a signal pad on a substrate; providing a passivation layer on the source electrode, the drain electrode and the signal pad, providing a planarization layer on the passivation layer; providing a anode electrode connected with the source electrode or drain electrode, and providing an auxiliary electrode spaced apart from the anode electrode; providing a contact hole for exposing the signal pad by removing a predetermined portion of the passivation layer; providing a bank on one side and the other side of the anode electrode and one side and the other side of the auxiliary electrode; providing an organic emitting layer on the anode electrode; and providing a cathode electrode connected with the auxiliary electrode and provided on the organic emitting layer, in which the signal pad includes a lower signal pad, a central signal pad and an upper signal pad, and the central signal pad is surrounded by the lower signal pad, the upper signal pad and the passivation layer.