OLED Passivation Adhesive Layer for Moisture Barrier
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Solution Overview
Problem
Conventional OLED display panels face performance and reliability issues due to poor bonding between silicon oxide passivation layers and sealants, allowing water vapor to enter the OLED element, which reduces the device's performance and service life.
Innovation Solution
An organic light emitting diode display panel with a passivation layer of silicon oxide and an adhesive layer made of epoxy resin doped with titanium dioxide, calcium oxide, and silicon oxide, located in a groove around the OLED element, is used. The adhesive layer provides a strong bond with both the sealant and the passivation layer, preventing water vapor ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicon oxide passivation layer is used in conventional OLED display panels, then the passivation function is provided, but the bonding effect with sealant is poor, allowing water vapor to enter the OLED element
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the silicon oxide passivation layer and the sealant. This adhesive layer serves as a mediator that provides both adhesion to the inorganic passivation layer and bonding to the organic sealant, resolving the incompatibility between these two materials and preventing water vapor ingress.
Solution Approach 2:
The adhesive layer is formulated as a composite material containing silane coupling agent, epoxy resin, and titanium dioxide. This composite structure combines the adhesion properties of silane coupling agent, the bonding strength of epoxy resin, and the sealing enhancement of titanium dioxide, creating a multi-functional intermediate layer that simultaneously bonds to both the passivation layer and sealant.
2Strength
If the adhesive layer is made of epoxy resin doped with titanium dioxide, calcium oxide and silicon oxide, then the bonding strength with sealant and passivation layer is improved, but the manufacturing complexity increases
Solution Approach 1:
Multiple functional materials (silane coupling agent, epoxy resin, titanium dioxide, calcium oxide, and silicon oxide) are merged into a single adhesive layer formulation. This combination integrates adhesion, bonding, sealing, and moisture resistance functions into one layer, simplifying the overall structure despite the complex material composition.
Solution Approach 2:
The adhesive layer's composition parameters are optimized to balance performance and manufacturability. By controlling the doping ratios of titanium dioxide, calcium oxide, and silicon oxide in the epoxy resin matrix, the formulation achieves maximum bonding strength while maintaining processability and compatibility with existing manufacturing workflows.
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 enhances the bonding strength between the sealant and the passivation layer, effectively preventing water vapor from entering the OLED element, thereby improving the OLED element's performance and service life while ensuring good reliability.
Implementation Method 1
an adhesive layer disposed on the passivation layer and located at a periphery of the organic light emitting diode element... The adhesive layer has a good bonding force with the sealant and also has a good bonding force with the passivation layer
Data Source
AI summary
Provided are an organic light emitting diode display panel and packaging method thereof. The organic light emitting diode display panel is provided with an adhesive layer on a passivation layer corresponding to a position of a sealant. When packaging the organic light emitting diode, the sealant on a cover plate is adhered corresponding to a position of the adhesive layer. The adhesive layer has a good bonding force with the sealant and also has a good bonding force with the passivation layer. Thus, water vapor does not easily enter the organic light emitting diode element, which will not reduce the performance of the organic light emitting diode element to improve a service life of organic light emitting diode element and to possess a good reliability performance.