Organic Light Emitting Display Getter Layer Moisture Protection
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Solution Overview
Problem
Organic light-emitting display apparatuses are vulnerable to external moisture and oxygen, which can damage the thin film transistors and organic light-emitting devices, leading to reduced durability and efficiency.
Innovation Solution
Incorporating a getter layer between the substrate and encapsulation member, made of materials like Ba, Ca, Mg, Ti, V, Zr, Nb, Mo, Ta, Th, Ce, Al, and Ni, that overlaps with the internal circuit unit and is covered by a passivation layer, along with a pixel defining layer and sealing member to form a barrier against moisture and oxygen, and using a transmissive conductive material for electrodes to enhance light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a getter is disposed between the substrate and encapsulation member to protect internal circuit units, then reliability is improved, but device complexity increases
Solution Approach 1:
A getter is introduced as an intermediary component between the substrate and encapsulation member to protect internal circuit units from moisture and oxygen. The getter acts as a mediator that absorbs harmful substances before they reach the sensitive internal circuits, thereby improving reliability without requiring fundamental redesign of the encapsulation structure.
Solution Approach 2:
The getter is nested within the existing encapsulation structure, specifically positioned between the substrate and encapsulation member where it can overlap with internal circuit units. This nesting approach allows the protective function to be integrated into the existing device architecture rather than adding external protective structures.
2Reliability
If the passivation layer is extended to cover the internal circuit unit, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The passivation layer is formed to extend over the internal circuit unit during the initial manufacturing process, before final assembly and encapsulation. This preliminary extension ensures that the internal circuit units are protected from the outset, and subsequent processing steps can focus on precise positioning rather than forming the protective layer itself.
3Use of energy by moving object
If transmissive conductive material is used for electrodes to enhance light efficiency, then light efficiency is improved, but electrical conductivity may be reduced
Solution Approach 1:
The electrode structure employs composite materials that combine transmissive conductive materials with highly conductive materials. This composite approach allows the electrode to simultaneously achieve high light transmissivity for improved light efficiency and sufficient electrical conductivity for reliable device operation, resolving the trade-off between these two critical properties.
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
The solution effectively prevents damage from moisture and oxygen, improving the durability and light efficiency of the organic light-emitting display apparatus by forming a protective barrier and optimizing the electrode structure.
Implementation Method 1
a getter that is disposed between the substrate and the encapsulation member to at least partially overlap with the internal circuit unit
Data Source
AI summary
An organic light-emitting display apparatus includes a thin film transistor on a display region of a substrate, the thin film transistor facing an encapsulation member, an organic light-emitting device on the display region that includes an intermediate layer having an organic emission layer, a sealing member that is between the substrate and the encapsulation member and that surrounds the display region, an internal circuit unit between the display region and the sealing member, a passivation layer that extends to cover the internal circuit unit, a pixel defining layer on the passivation layer, and a getter between the substrate and the encapsulation member, and the getter at least partially overlapping the internal circuit unit.