OLED Thin Film Encapsulation Conductive Layer Post-Encapsulation Aging
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Solution Overview
Problem
OLED displays face progressive failures due to uneliminated fine particles after thin film encapsulation, as the aging process to address impurities is typically performed before the module is completed.
Innovation Solution
Incorporating a conductive layer within the thin film encapsulation structure, formed using methods like sputtering or plasma coating, between the buffering layer and the organic light emitting element, allowing for effective impurity elimination post-encapsulation through voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the aging process is performed before module completion, then impurities can be eliminated, but the process cannot correct failures generated after encapsulation
Solution Approach 1:
The conductive layer is pre-formed as part of the thin film encapsulation structure, creating a built-in pathway that enables aging processes to be performed at any stage including after module completion. This preliminary structural integration allows flexibility in manufacturing timing while ensuring post-encapsulation failure correction capability.
2Reliability
If a conductive layer is added to the thin film encapsulation structure, then post-encapsulation aging becomes possible, but device complexity increases
Solution Approach 1:
The conductive layer is merged with the thin film encapsulation structure, combining the protective encapsulation function with the aging process enablement function in a single integrated structure. This merging approach allows post-encapsulation aging capability to be achieved without adding separate external components, thereby limiting the increase in device complexity.
Solution Approach 2:
The thin film encapsulation structure is designed to serve multiple functions: providing protective encapsulation and simultaneously enabling post-encapsulation aging processes through the integrated conductive layer. This multi-functionality reduces the need for additional dedicated components, thereby limiting complexity increase while achieving reliability improvements.
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 eliminates impurities and reduces progressive failures in OLED displays, ensuring improved reliability and performance by allowing the aging process to be performed after the module is completed.
Implementation Method 1
The at least one conductive layer may be formed using a sputtering method or a plasma coating method
Implementation Method 2
The at least one conductive layer may be formed using a sputtering method or a plasma coating method
Implementation Method 3
The thin film encapsulation layer includes at least one conductive layer having a voltage application pad... A voltage applied to the voltage application pad may be less than 50 V
Data Source
AI summary
An organic light emitting diode (OLED) display is provided. The OLED display includes a substrate, an organic light emitting element on the substrate, and a thin film encapsulation layer on the substrate and covering the organic light emitting element. The thin film encapsulation layer includes at least one conductive layer having a voltage application pad.