OLED Display Substrate Groove Moisture Isolation
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Solution Overview
Problem
Current OLED device packaging methods fail to effectively isolate moisture, leading to micro-electrolytic cell failure and reduced device lifespan due to chemical reactions with metallic cathodes and organic materials.
Innovation Solution
A display substrate with an annular package region featuring a groove structure containing water-absorbing material, which absorbs moisture and oxygen, preventing chemical reactions and improving moisture isolation during the curing process of the resin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resin and inorganic material are used to form a sealed adhesive layer, then mechanical strength is improved, but moisture isolation capability is insufficient
Solution Approach 1:
The patent uses a composite packaging structure combining organic resin (epoxy) and inorganic material (such as silicon oxide or silicon nitride) in a multi-layer configuration. The inorganic layer provides superior moisture barrier properties while the organic resin provides mechanical strength and sealing, creating a composite material system that achieves both mechanical strength and effective moisture isolation.
2Productivity
If UV light is used to cure the resin layer for packaging, then packaging efficiency is improved, but liquid byproduct generation causes defects
Solution Approach 1:
The patent extracts and removes the harmful liquid byproduct generated during UV curing from the packaging structure by providing a dedicated groove structure that collects and contains the liquid, preventing it from causing defects in the cured resin layer while maintaining the efficiency benefits of UV curing.
Solution Approach 2:
The groove structure acts as an intermediary element between the UV curing process and the final packaged product, providing a pathway for the liquid byproduct to be safely collected and removed, thereby mediating between the efficient UV curing process and the requirement for defect-free packaging.
3Reliability
If metallic cathode of aluminum is used, then device performance is improved, but reactivity with moisture causes failure
Solution Approach 1:
The inorganic packaging layer (silicon oxide or silicon nitride) serves as an intermediary barrier between the aluminum metallic cathode and moisture in the environment. This intermediate layer prevents direct contact and chemical reaction between the reactive aluminum and moisture, while allowing the aluminum cathode to maintain its electrical and optical performance functions.
Solution Approach 2:
The patent converts the harmful reactivity of aluminum with moisture into a beneficial situation by using the grooves to collect and isolate any moisture that might otherwise contact the cathode, and by using the curing liquid collection to prevent defects that would compromise the protective packaging.
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 moisture isolation and extends the lifespan of OLED devices by preventing chemical reactions that cause device failure, ensuring improved reliability and performance.
Implementation Method 1
the groove region is formed with a groove structure in which water-absorbing material is provided... moisture can be absorbed by the water-absorbing material within the groove structure
Implementation Method 2
When the adhering region is irradiated by UV light to cure a resin layer so as to package
Data Source
AI summary
A display substrate includes an annular package region and a display region inside package region. The package region includes an annular adhering region and a groove region positioned inside and/or outside the adhering region. A groove structure in which water-absorbing material and/or oxygen-absorbing material is provided is formed in the groove region. The display substrate can solve the problems of poor moisture isolation effect and influence of oxygen in the conventional display device. A display device including the display substrate is further provided.