OLED Gather Electrode Gettering for Moisture Protection
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Solution Overview
Problem
Dual panel type OLED devices face challenges in maintaining the reliability and lifespan of organic light emission diode elements due to exposure to moisture and oxygen, which cause deterioration and defects like dark spots and pixels, despite sealing methods and the use of UV hardening resins and getters.
Innovation Solution
The OLED device incorporates a sealant between first and second substrates, with driver elements on one substrate and organic light emission diode elements on the other, featuring a gather electrode formed from an electrically conductive material and an oxidation-resistant material with a lower oxidative index, which removes moisture and oxygen, and includes a buffer pattern and separator to enhance electrical contact and prevent oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seal substrate and UV hardening resin are used to seal organic light emission diode elements, then protection from external environment is improved, but complete sealing against moisture and oxygen intrusion is not achieved
Solution Approach 1:
The sealing system is divided into multiple segments: seal substrate, UV hardening resin, and getter material. Each component performs a specific function - the seal substrate provides structural enclosure, the UV resin provides adhesive sealing, and the getter material actively absorbs residual moisture and oxygen, collectively achieving complete protection
Solution Approach 2:
The sealing structure uses composite materials combining organic UV hardening resin with inorganic getter materials (such as calcium oxide or barium oxide). This composite approach leverages the adhesive properties of the resin and the moisture-absorbing properties of the getter material to achieve superior sealing performance
2Reliability
If gather is inserted into OLED device to eliminate moisture and oxygen, then reliability and lifespan are improved, but device complexity increases due to additional components
Solution Approach 1:
The seal substrate serves multiple functions: it provides structural support for the OLED device, acts as a barrier to moisture and oxygen, and incorporates getter material to actively eliminate residual contaminants. This multi-functionality eliminates the need for separate gather components, reducing device complexity while maintaining improved reliability
3Ease of manufacture
If dual panel type structure with driver elements and organic light emission diode elements in separate substrates is used, then manufacturing flexibility is improved, but electrical contact reliability between driver elements and light emission elements deteriorates
Solution Approach 1:
The UV hardening resin acts as an intermediary material between the driver elements on the first substrate and the organic light emission diode elements on the second substrate. It provides both mechanical bonding to hold the substrates together and electrical conductivity to ensure reliable signal transmission, thus maintaining manufacturing flexibility while improving contact reliability
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 improves the reliability and lifespan of OLED devices by preventing moisture and oxygen ingress, maintaining stable electrical contact, and reducing defects like dark spots and pixels, while also simplifying the manufacturing process and avoiding additional photolithography steps.
Implementation Method 1
gather electrodes arranged on the second substrate including the organic light emission diode elements and formed of an electrically conductive gather material and an oxidation-resistant electrically conductive material having an oxidative index lower than that of the electrically conductive gather material
Data Source
AI summary
An OLED adapted to ensure the reliability and improve the lifespan and to improve an electric contact characteristic between a drive element and an organic light emission diode is disclosed. The OLED device includes: first and second substrates, opposite to each other at a interval, sealed by a sealant; driver elements arranged on the inner surface of the first substrate; organic light emission diode elements, arranged on the inner surface of the second substrate, each including a contact portion upwardly protruding from this substrate; and gather electrodes arranged on the second substrate including the organic light emission diode elements and formed of an electrically conductive gather material and an oxidation-resistant electrically conductive material having an oxidative index lower than that of the electrically conductive gather material.