Pixel Defining Layer Gradient via Magnetic Nanoparticles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for preparing pixel defining layers in display devices, such as OLEDs and LCDs, require the use of both lyophobic and lyophilic materials and involve complex patterning processes, making it difficult to achieve a gradient from lyophobic to lyophilic properties necessary for uniform pixel layer formation and preventing contamination between pixels.
Innovation Solution
A preparation material comprising 5%-30% lyophobic film-forming polymer, 0.5%-1% lyophilic magnetic nanoparticles, 0.5%-2% photoinitiator, 0.1%-1% reactive monomer, 0.1%-1% additive, and a solvent, which is applied to a substrate and patterned using an external magnetic field to induce lyophilic nanoparticles to the lower portion, creating a gradient from lyophobic to lyophilic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the upper portion of the pixel defining layer is made lyophobic to prevent organic solution spreading, then contamination between adjacent pixels is avoided, but the organic solution cannot uniformly spread on the bottom of the pixel region
Solution Approach 1:
The pixel defining layer is designed with spatially varying surface properties: the upper portion contains lyophobic materials to prevent organic solution spreading and contamination, while the bottom portion contains lyophilic materials to enable uniform spreading and formation of uniform pixel layer thickness. This local differentiation of surface properties resolves the contradiction between preventing contamination and achieving uniform thickness.
Solution Approach 2:
The pixel defining layer is divided into functionally distinct regions: an upper region with lyophobic characteristics for contamination prevention and a lower region with lyophilic characteristics for uniform solution distribution. This segmentation allows each region to independently perform its specific function, resolving the contradiction between the opposing requirements of the upper and bottom portions.
2Manufacturing precision
If separate patterning processes are used for lyophobic and lyophilic materials to form the pixel defining layer, then the gradient from lyophobic to lyophilic properties is achieved, but the preparation process becomes complex
Solution Approach 1:
The invention combines both lyophobic and lyophilic materials into a single integrated pixel defining layer structure. The layer simultaneously incorporates upper portion materials with lyophobic properties and bottom portion materials with lyophilic properties, eliminating the need for separate patterning processes while maintaining the desired gradient from lyophobic to lyophilic properties throughout the layer thickness.
Solution Approach 2:
The pixel defining layer is constructed as a composite material system combining different polymer materials with contrasting surface properties. The composite structure integrates lyophobic materials (such as fluorinated polymers) in the upper portion and lyophilic materials (such as acrylic polymers) in the bottom portion, creating a functionally graded material that achieves the desired property gradient without complex multi-step patterning.
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 simplifies the preparation process, ensures uniform pixel layer thickness, prevents contamination between pixels, and enhances the display effect and product quality by effectively controlling the lyophilicity and lyophobicity of the pixel defining layer.
Implementation Method 1
patterned using an external magnetic field to induce lyophilic nanoparticles to the lower portion
Implementation Method 2
0.5%-2% of a photoinitiator, 0.1%-1% of a reactive monomer
Data Source
AI summary
The present disclosure provides a pixel defining layer and a preparation material thereof, and a display substrate and a preparation method thereof, and relates to the field of display technologies. The preparation material of the pixel defining layer comprises the following components in mass percentages: 5%-30% of a lyophobic film-forming polymer, 0.5%-1% of lyophilic magnetic nanoparticles, 0.5%-2% of a photoinitiator, 0.1%-1% of a reactive monomer, 0.1%-1% of an additive and the balance of a solvent.