OLED Display Panel Water Absorption Layer for Moisture Removal
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Solution Overview
Problem
Existing OLED display panels face short lifespan due to moisture absorption, which corrodes organic light-emitting layer materials and cathode metal materials, necessitating effective water and oxygen removal capabilities within the encapsulation layer.
Innovation Solution
Incorporating a water absorption layer with a mixture of oxides and water-absorbent resins, such as poly-acrylates and calcium oxide, between the pixel definition layer and the encapsulation layer, along with an adhesive layer to attach the water absorption layer, enhances moisture removal and prevents damage to the OLED display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation layer is added to isolate the OLED light emitting device from the external environment, then moisture and oxygen barrier properties are improved, but moisture trapped inside the encapsulation layer causes corrosion and shortens lifespan
Solution Approach 1:
A water absorption layer is formed on the pixel definition layer before the encapsulation layer is deposited. This preliminary action ensures that moisture is absorbed and removed from the internal environment before the encapsulation is completed, preventing moisture accumulation that would otherwise cause corrosion and extend the panel lifespan
Solution Approach 2:
The water absorption layer acts as an intermediary between the pixel definition layer and the encapsulation layer. It provides water and oxygen removal capabilities within the sealed structure, mediating the conflict between maintaining a sealed barrier and preventing internal moisture corrosion
2Reliability
If the encapsulation layer is made more impermeable to improve barrier properties, then moisture prevention is enhanced, but moisture released from organic materials inside cannot escape
Solution Approach 1:
The water absorption layer serves as an intermediary moisture management system within the encapsulation structure. It actively absorbs and removes moisture released from organic light-emitting layer materials and cathode metal materials, preventing corrosion while allowing the encapsulation layer to maintain its impermeable barrier properties
Solution Approach 2:
The water absorption layer is locally positioned on the pixel definition layer, providing targeted moisture removal capability at the specific location where organic materials are present. This localized approach addresses the harmful effect of trapped moisture without compromising the overall barrier performance of the encapsulation layer
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 extends the lifespan of OLED display panels by preventing moisture absorption and corrosion, ensuring reliable performance by removing moisture and potentially oxygen between the array substrate and the encapsulation layer.
Implementation Method 1
a water absorption layer is disposed over the pixel definition layer, and the water absorption layer is configured to remove moisture between the array substrate and the encapsulation layer
Implementation Method 2
an adhesive layer is disposed between the water absorption layer and the pixel definition layer, and the adhesive layer is configured to attach the water absorption layer to the pixel definition layer
Data Source
AI summary
An organic light-emitting diode (OLED) display panel and a manufacture method thereof are provided, which can enable the organic material encapsulated inside to have the function of removing water and oxygen, thereby further ensuring a reliable lifespan of the OLED display panel.