OLED Encapsulation Buffer Structure for Viscosity Mismatch
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Solution Overview
Problem
The existing encapsulation methods for OLED devices, such as Dam & Fill, suffer from issues like bubbles, uneven edges, and glue flushing due to viscosity differences between the Dam glue and Fill glue, leading to poor packaging effects and reduced reliability.
Innovation Solution
A display panel with a sealing assembly comprising a box dam structure, a buffer structure, and a filling structure, where the buffer structure is made of a material with viscosity between the box dam and filling materials, ensuring stability and flexibility to alleviate these issues, and allowing for a wider selection of materials with improved sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Dam & Fill encapsulation method is used, then encapsulation structure is formed, but bubbles, uneven edges, and glue flushing occur due to viscosity differences
Solution Approach 1:
The encapsulation structure is divided into three distinct segments: box dam structure, buffer structure, and filling structure. Each segment uses material with specific viscosity characteristics, creating a graduated transition from high to low viscosity that prevents mixing and defects while maintaining reliable encapsulation.
Solution Approach 2:
Different regions of the encapsulation structure are assigned different material viscosities tailored to their specific functions. The box dam structure uses high viscosity material for structural stability, the buffer structure uses intermediate viscosity for transition, and the filling structure uses low viscosity for complete filling, ensuring optimal performance in each local region.
2Stability of the object's composition
If high viscosity material is used for box dam structure, then structural stability is improved, but material selection is limited and matching with filling material becomes difficult
Solution Approach 1:
The invention changes the viscosity parameter across different encapsulation regions rather than using a single viscosity value. This parameter gradient approach allows high viscosity material in the box dam for stability while using lower viscosity materials in subsequent regions, expanding material selection flexibility and easing matching requirements.
Solution Approach 2:
The encapsulation system uses composite material construction with three different materials having progressively decreasing viscosities. This composite approach combines the advantages of high viscosity materials (structural stability) with low viscosity materials (filling capability), achieving both stability and material versatility.
3Reliability
If buffer structure with intermediate viscosity is introduced, then sealing effect is improved, but device complexity increases
Solution Approach 1:
The buffer structure acts as an intermediary element between the box dam structure and the filling structure. Its intermediate viscosity creates a smooth transition zone that prevents direct interaction between high and low viscosity materials, eliminating defects while maintaining a relatively simple overall structure.
Data Source
AI summary
Embodiments of the present disclosure provide a display panel and a method of manufacturing the same, and a display apparatus. The display panel includes: a display substrate; a packaging cover plate; a sealing assembly. The sealing assembly includes a box dam structure, a buffer structure and a filling structure, the box dam structure forms a sealing space together with the display substrate and the packaging cover plate, the buffer structure and the filling structure are located in the sealing space, and the buffer structure is located between the box dam structure and the filling structure. The box dam structure is made of a first material, the buffer structure includes a second material, the filling structure is made of a third material, and a viscosity of the second material is greater than a viscosity of the third material and less than a viscosity of the first material.