OLED Panel Hydrophobic Partition Wall Ink Overflow
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Solution Overview
Problem
OLED display panels face challenges with ink overflowing during printing due to the traditional method of using multiple partition walls, which increases the distance from the effective display region and hinders the creation of narrow-framed displays, and are susceptible to moisture and oxygen ingress.
Innovation Solution
An OLED display panel design featuring a substrate with a display and non-display region, a first inorganic layer, a hydrophobic layer on the partition wall, an organic layer inside the partition wall, and a second inorganic layer, where the hydrophobic layer forms an annular structure to prevent ink overflow and moisture/oxygen ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple partition walls are used to prevent ink overflow, then ink control is improved, but the distance from the cutting edge to the effective display region increases
Solution Approach 1:
The patent changes the surface energy parameter of the partition wall by coating it with a hydrophobic material. This parameter change creates a repulsive force against the hydrophilic organic ink, preventing overflow without requiring additional physical distance or multiple partition walls
Solution Approach 2:
The patent replaces the mechanical approach of using multiple physical partition walls with a chemical/surface property approach using hydrophobic coating. This substitution eliminates the need for additional structural elements while achieving the same ink containment function
2Reliability
If traditional glass packaging is used, then moisture and oxygen protection is improved, but flexibility is reduced
Solution Approach 1:
The patent replaces rigid glass packaging with flexible thin film layers comprising inorganic and organic layers. The inorganic layer provides barrier protection against moisture and oxygen, while the organic layer provides flexibility and planarization, achieving both protection and flexibility
Solution Approach 2:
The patent uses a composite packaging structure with inorganic layers (for barrier protection) and organic layers (for flexibility and planarization). This composite approach combines the advantages of both material types to achieve simultaneous moisture/oxygen protection and flexibility
3Manufacturing precision
If lower viscosity ink is used for printing, then leveling effect is improved, but ink overflow risk increases
Solution Approach 1:
The patent introduces a hydrophobic coating as an intermediary between the partition wall and the organic ink. This intermediary layer creates a repulsive interface that prevents the low-viscosity ink from adhering to and overflowing beyond the partition wall, while still allowing adequate leveling within the display region
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 design enhances ink leveling, prevents ink overflow, and allows for narrower frame displays while improving boundary packaging by using a hydrophobic layer made of polytetrafluoroethylene to cover the partition wall, effectively addressing the issues of ink control and environmental protection.
Implementation Method 1
a hydrophobic layer disposed on the first inorganic layer and corresponding to the partition wall
Data Source
AI summary
An OLED (organic light emitting diode) display panel is provided. The OLED display includes a substrate having a display region and a non-display region disposed around the display region, and the non-display region is provided with a partition wall. A first inorganic layer is disposed on the display region and the partition wall. A hydrophobic layer is disposed on the first inorganic layer and located corresponding to the partition wall. An organic layer is disposed on the first inorganic layer and a portion of the hydrophobic layer, wherein the organic layer is disposed on an inner side of the partition wall adjacent to the display region. A second inorganic layer is disposed on the organic layer.