Lyophobic Barrier Dam for OLED Encapsulation Overflow Control
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Solution Overview
Problem
Current OLED electronic display products face limitations in encapsulation yield due to their design structure, leading to issues with moisture and oxygen penetration, which affects the encapsulation effectiveness and increases the difficulty of the fabrication process.
Innovation Solution
A display substrate with a base substrate, barrier dams, and a first encapsulating layer, where the barrier dam is lyophobic to the encapsulating material in its non-cured state, preventing overflow and allowing for a thicker, more effective encapsulating layer while maintaining the same thickness, thereby improving encapsulation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulating layer is made thicker to improve encapsulation effectiveness, then the encapsulation yield improves, but the fabrication complexity increases
Solution Approach 1:
The barrier dam is formed in advance with a lyophobic surface treatment before applying the encapsulating material. This preliminary action prevents the material from adhering to the dam, allowing the encapsulating layer to be applied thicker without overflow or adhesion issues, thereby improving encapsulation effectiveness while maintaining manageable fabrication complexity
Solution Approach 2:
The surface energy parameter of the barrier dam is changed through lyophobic treatment, making it repel the encapsulating material. This parameter change allows the encapsulating layer to maintain a greater thickness without adhering to the dam, improving encapsulation effectiveness while avoiding the need for complex multi-step fabrication processes
2Reliability
If the encapsulating layer thickness is increased, then the protection against moisture and oxygen improves, but the flatness of the encapsulating layer deteriorates
Solution Approach 1:
The barrier dam surface is pre-treated to be lyophobic, creating a release surface before the encapsulating material is applied. This allows the material to be deposited in a thicker layer without adhering to the dam structure, maintaining flatness while improving protection against moisture and oxygen penetration
Solution Approach 2:
The harmful adhesion property is extracted from the barrier dam surface through lyophobic treatment. By removing the adhesive characteristic, the encapsulating material can be applied in thicker layers without sticking to the dam, thus maintaining flatness while enhancing protection against environmental factors
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 flatness and thickness of the encapsulating layer, improving the encapsulation yield and reducing the risk of moisture and oxygen invasion, while maintaining the structural integrity and reducing fabrication complexities.
Implementation Method 1
at least a side of the barrier dam facing the first encapsulating layer is lyophobic with respect to the first encapsulating material in a non-cured state
Data Source
AI summary
The present disclosure provides a display substrate, a fabrication method thereof and a display panel. The display substrate includes a display area (101) and a non-display area (102) around the display area (101), the display substrate further includes: a base substrate (100); at least one barrier dam (200) and a first encapsulating layer (310) on the base substrate (100), the barrier dam (200) is in the non-display area (102) on the base substrate (100), the first encapsulating layer (310) is on the base substrate (100) and on a side of the at least one barrier dam (200) facing the display area (101), the first encapsulating layer (310) is formed by a first encapsulating material (301) in a cured state, and at least a side of the barrier dam (200) facing the first encapsulating layer (310) is lyophobic with respect to the first encapsulating material (301) in a non-cured state.