LED Display Substrate PDL Surface Energy Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for manufacturing LED display substrates require additional equipment investments to improve the wetting characteristics of the pixel define layer (PDL) for smooth filling of luminescent material, increasing manufacturing costs and making mass production less advantageous.
Innovation Solution
A method involving the formation of a hydrophilic first PDL and a hydrophobic second PDL on a substrate, with the second PDL being treated to achieve a specific surface energy density, allowing for efficient filling of luminescent material within pixel regions without additional equipment complexity, ensuring flat and complete coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fluorination treatment is applied to the PDL surface using CVD process, then the wetting characteristic of the PDL surface is improved, but the manufacturing cost increases due to additional equipment investment
Solution Approach 1:
The invention changes the surface energy parameter of the PDL by treating it with oxygen plasma, transforming the surface from hydrophobic to hydrophilic. This parameter change improves wetting characteristics without requiring additional CVD equipment, thereby resolving the contradiction between manufacturing precision and ease of manufacture
Solution Approach 2:
The invention replaces the CVD process (chemical vapor deposition equipment) with a plasma treatment process. This substitution eliminates the need for expensive CVD equipment while achieving the desired surface modification, thus reducing manufacturing costs while maintaining improved wetting characteristics
2Measurement precision
If the dimension of pixels is reduced to 30 μm×180 μm for high resolution, then the display resolution is improved, but the droplet filling becomes difficult as the droplet diameter is more than 30 μm
Solution Approach 1:
The invention changes the surface energy parameter of the PDL through plasma treatment, creating a hydrophilic surface that improves wetting characteristics. This allows luminescent material droplets to spread and fill the pixel region uniformly even when the pixel dimensions (30 μm×180 μm) are comparable to or smaller than the droplet diameter, thereby resolving the contradiction between display resolution and droplet filling quality
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 enhances the luminous quality of LED display substrates by preventing luminescent material droplets from flowing to adjacent pixel regions, improving the manufacturing efficiency and reducing costs associated with equipment investments.
Implementation Method 1
the second PDL made of a hydrophobic material is disposed on the first PDL made of a hydrophilic material
Implementation Method 2
the second PDL made of a hydrophobic material is disposed on the first PDL made of a hydrophilic material
Implementation Method 3
a surface energy density of the second PDL reaches up to 60-120 mJ/cm2
Data Source
AI summary
A light-emitting diode (LED) display substrate, a method for manufacturing the same, and a display device are provided and involve the display field. The method for manufacturing the LED display substrate comprises: forming a transparent conductive anode (201) on a substrate (200); forming a pixel region defined by a first PDL (202) and a second PDL (203) on the substrate (200) on which the anode (201) is formed, in which the second PDL (203) made of a hydrophobic material is disposed on the first PDL (201) made of a hydrophilic material; filling a luminescent material into the pixel region to form an emission layer (204) with the luminescent material; and forming a conductive cathode (205) on the substrate (200) on which the emission layer (204) is formed. The manufacturing method allows the luminescent materials to be flatly laid on the LED display substrate so as to improve the luminous quality of the LED display substrate.