OLED Pixel Defining Layer Fabrication Reducing Mask Plate Requirements
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Solution Overview
Problem
Existing OLED display panel fabrication methods face issues with mask plate requirements, high production costs, and inefficiencies due to the 'coffee ring effect' causing non-uniformity and leakage in single-layer pixel defining layers, while double-layer structures increase production faults and costs with the need for two mask plates.
Innovation Solution
A method involving the formation of a first pixel defining layer with lyophilic properties and a second pixel defining layer with lyophobic properties, where the second layer is treated with fluoridization to achieve the desired properties, reducing the need for multiple mask plates and enhancing production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer pixel defining layer is used, then the device structure is simplified, but the coffee ring effect causes non-uniformity and leakage
Solution Approach 1:
The pixel defining layer is divided into two separate layers: a first pixel defining layer and a second pixel defining layer. This segmentation allows each layer to perform specific functions - the first layer provides structural definition while the second layer prevents the coffee ring effect, thereby achieving both structural simplicity and manufacturing precision without requiring complex single-layer designs
Solution Approach 2:
The patent uses composite material structure with two different pixel defining layers having different properties. The first layer and second layer are made of different materials or have different surface characteristics, creating a composite structure that combines the advantages of both materials to prevent the coffee ring effect while maintaining structural integrity
2Manufacturing precision
If a double-layer pixel defining layer structure is used to prevent coffee ring effect, then uniformity is improved, but production faults and costs increase due to requiring two mask plates
Solution Approach 1:
The patent merges the functions of two mask plates into a single mask plate by designing the first and second pixel defining layers to be formed simultaneously or in sequence using the same masking structure. This combining approach maintains the uniformity benefits of a double-layer structure while eliminating the need for two separate mask plates, thereby reducing production faults and costs
Solution Approach 2:
The single mask plate is designed to serve multiple functions - it defines patterns for both the first pixel defining layer and the second pixel defining layer. This multi-functional mask plate eliminates the need for separate masking operations, reducing production complexity while maintaining the precision benefits of the dual-layer structure
3Ease of manufacture
If traditional pixel defining layer methods are used, then production process is straightforward, but material utilization ratio is low and production efficiency is reduced
Solution Approach 1:
The patent changes the surface energy parameters of the pixel defining layers by using materials with appropriate surface tension characteristics. This parameter optimization prevents the coffee ring effect during material deposition, improving material utilization ratio and production efficiency while maintaining process simplicity through controlled parameter selection rather than complex process changes
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
This approach reduces production costs and improves efficiency by eliminating the need for a second mask plate, minimizing defects like leakage and non-uniform brightness, while maintaining effective light emission areas.
Implementation Method 1
forming a first pixel defining layer through dry etching and removing the first pixel defining layer thin film that is exposed
Implementation Method 2
the formed second pixel defining layer is subjected to a fluoridization treatment to make the second pixel defining layer has a lyophobic property
Data Source
AI summary
An organic light emitting diode display panel and a fabrication method thereof, a display device are provided, and the method includes: forming an anode layer (41) a light-emitting layer and a cathode layer on a substrate (40) and the method further includes: depositing a first pixel defining layer thin film (51) on the anode layer (41); depositing a second pixel defining layer thin film on the first pixel defining layer thin film (51), and forming a second pixel defining layer (61) by patterning the second pixel defining layer thin film through patterning process; and forming a first pixel defining layer (71) through dry etching and removing the first pixel defining layer thin film that is exposed; wherein the first pixel defining layer (71) has a lyophilic property and the second pixel defining layer (61) has a lyophobic property. A double-layer pixel defining layer prepared in the method is capable of reducing a mask plate, reducing the production cost, and improving the production efficiency.