OLED Base Substrate Water Oxygen Blocking via Absorbing Doping
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Solution Overview
Problem
OLED devices face significant challenges in blocking water and oxygen intrusion from both the top and bottom surfaces, particularly due to the poor water and oxygen blocking performance of polyimide substrates, which shortens the device's service life.
Innovation Solution
A fabricating method for OLED devices involves coating a polyimide material doped with water and oxygen-absorbing materials like CaO, BaO, NaOH, or MgCl2 on a glass substrate, forming a base substrate, and then creating a thin film transistor (TFT) layer and encapsulation layer, with an optional inorganic barrier layer to enhance water and oxygen blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polyimide material is used as base substrate, then flexibility and high temperature resistance are achieved, but water and oxygen blocking performance deteriorates
Solution Approach 1:
The patent applies composite materials by combining polyimide with water and oxygen absorbing materials (such as metal oxides, hydroxides, or halides) to create a composite base substrate. This composite structure maintains the flexibility and high temperature resistance of polyimide while adding the water and oxygen blocking capabilities of the absorbing materials, thus resolving the contradiction between flexibility and protection performance.
Solution Approach 2:
The patent introduces an intermediary layer or component - the water and oxygen absorbing material - that acts as a mediator between the polyimide substrate and the OLED device. This intermediary absorbs water and oxygen that would otherwise penetrate through the polyimide, thereby protecting the OLED without compromising the substrate's flexibility or thermal properties.
2Temperature
If polyimide material is used as base substrate, then high temperature resistance is achieved, but water and oxygen blocking performance deteriorates
Solution Approach 1:
The patent creates a composite base substrate by integrating polyimide with water and oxygen absorbing materials. This composite structure preserves the high temperature resistance of polyimide (up to 400°C) while simultaneously providing water and oxygen blocking functionality through the absorbing materials, thus resolving the contradiction between temperature resistance and protection performance.
3Reliability
If doping material is added to polyimide solution, then water and oxygen blocking performance is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the substrate formation process with the water and oxygen absorption functionality by doping the absorbing materials directly into the polyimide solution before coating. This combining approach integrates multiple functions (substrate formation, flexibility, high temperature resistance, and water/oxygen blocking) into a single manufacturing step, thereby improving protection performance without significantly increasing process complexity.
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 method significantly improves the water and oxygen blocking performance of the base substrate without altering other substrate properties or increasing process complexity, resulting in a more reliable and long-lasting OLED device.
Implementation Method 1
the base substrate including a material capable of absorbing water and oxygen
Data Source
AI summary
The disclosure discloses a fabricating method of an OLED device, including the following steps: coating a polyimide material on a glass substrate to form a base substrate, the base substrate including a material capable of absorbing water and oxygen; fabricating an OLED device layer on the TFT layer; the disclosure also discloses a corresponding OLED device. In the embodiment of the disclosure, the water and oxygen blocking performance of the PI layer in the OLED device can be enhanced, and the service life of the OLED device can be improved.