Getter Material for OLED Impurity Adsorption
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Solution Overview
Problem
Conventional organic light-emitting display devices are prone to degradation due to the penetration of external impurities such as oxygen and moisture, which significantly reduce their lifetime, particularly through the interface between the sealant and the sealing substrate.
Innovation Solution
Incorporating a getter material, such as barium (Ba), calcium (Ca), or their alloys, on the inner walls of the substrate, sealing substrate, and sealant to form a barrier that reacts with and adsorbs moisture and oxygen, thereby preventing their penetration into the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is used to adhere the substrate to the sealing substrate, then the device is sealed to protect internal components, but external impurities such as oxygen and moisture can still penetrate through the sealant and interface between sealant and sealing substrate
Solution Approach 1:
A getter material is introduced as an intermediary substance between the sealed internal environment and the external environment. The getter material is formed on the inner wall surfaces of the substrate, sealing substrate, and sealant, creating a protective barrier that actively captures and reacts with penetrating impurities (oxygen and moisture) before they can reach and degrade the organic light-emitting layer and other internal components.
Solution Approach 2:
The getter material creates an inert protective environment within the sealed device by chemically binding with oxygen and moisture. This effectively removes harmful reactive gases from the internal atmosphere, maintaining a stable, non-reactive environment that prevents degradation of the organic light-emitting components throughout the device's operational lifetime.
2Reliability
If the device is sealed with a sealant, then the internal components are protected from external environment, but the interface between sealant and sealing substrate becomes a penetration path for impurities
Solution Approach 1:
The getter material is specifically positioned and formed on the inner wall surfaces of the substrate, sealing substrate, and sealant structure. This localized placement ensures that the protective function is concentrated exactly where impurity penetration is most likely to occur - at the sealant interfaces and internal surfaces - providing targeted protection without requiring changes to the overall sealing structure.
3Object-affected harmful factors
If getter material is formed on inner wall surfaces to surround the internal space, then impurity penetration is reduced, but the device structure becomes more complex
Solution Approach 1:
The getter material formation process is integrated with the existing device manufacturing steps. The getter is formed on the inner wall surfaces of the substrate, sealing substrate, and sealant as part of the assembly process, combining the sealing function and impurity capture function into a unified structure without requiring separate additional components or complex assembly operations.
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 getter material effectively extends the lifetime of the organic light-emitting display device by adsorbing and reacting with external impurities, ensuring the device's integrity and performance.
Implementation Method 1
a getter formed on the inner wall surfaces of the substrate, the sealing substrate, and the sealant, so as to surround a space formed inside the device by the inner wall surfaces
Implementation Method 2
the getter may include a material that reacts with moisture and oxygen
Data Source
AI summary
An organic light-emitting display device and a method of manufacturing the same, the organic light-emitting display device including: a substrate; a display unit disposed on the substrate; a sealing substrate disposed facing the display unit; a sealant adhering the substrate to the sealing substrate; and a getter formed on surfaces of the substrate, the sealing substrate, and the sealant that face a space formed inside the display device.