OLED Pixel Print Structure for High-Resolution Inkjet Printing
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Solution Overview
Problem
Current inkjet printing methods struggle to achieve high-resolution printing in small- and medium-sized OLED display devices due to limitations in the structure and performance parameters of existing inkjet printing apparatuses, resulting in low material utilization and high production costs.
Innovation Solution
A pixel print structure with a substrate, side walls, and an intermediate portion, where the first and second side walls define separate areas for ink printing and storage, allowing for high-resolution production without modifying the existing inkjet printing apparatus by adjusting the ink distribution and hydrophobic-hydrophilic properties to control ink flow and film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If inkjet printing method is used, then material utilization rate is high and large-sized full-color samples can be produced, but high-resolution printing in small- and medium-sized display devices cannot be achieved
Solution Approach 1:
The pixel definition layer is segmented into hydrophobic regions (side walls and intermediate portion) and hydrophilic regions (bottom portions), creating distinct functional zones within each pixel that enable precise ink confinement and high-resolution patterning using standard inkjet printing parameters
Solution Approach 2:
Different regions of the pixel definition layer are assigned different hydrophobic-hydrophilic properties: side walls and intermediate portion are hydrophobic to confine ink, while bottom portions are hydrophilic to promote uniform ink spreading and film formation, enabling both high resolution and material efficiency
2Manufacturing precision
If vapor deposition method is used, then high product resolution can be achieved, but material utilization rate is extremely low resulting in high cost
Solution Approach 1:
The pixel definition layer structure itself performs the function of ink confinement and patterning through its hydrophobic-hydrophilic properties, eliminating the need for additional mask structures or complex printing apparatus modifications, thereby achieving high resolution with standard inkjet equipment and high material utilization
3Ease of manufacture
If existing inkjet printing apparatus is used, then production process is simple, but high-resolution printing cannot be realized
Solution Approach 1:
The invention changes the surface energy parameters of the pixel definition layer by applying different hydrophobic and hydrophilic treatments to different regions, enabling precise control of ink behavior without modifying the physical structure of the inkjet printing apparatus, thus maintaining process simplicity while achieving high resolution
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
Enables the production of high-resolution OLED display devices by optimizing ink distribution and film formation, reducing manufacturing costs and simplifying the process flow, while maintaining compatibility with existing inkjet printing equipment.
Implementation Method 1
Each of the first abutment portion, the second abutment portion and the intermediate bottom portion has a hydrophobic-hydrophilic property opposite to that of the first side wall, the second side wall and the intermediate portion
Data Source
Figure 1~4(a)
Figure 4(b)~4(c)
AI summary
The present disclosure provides a pixel print structure, a manufacturing method thereof, a display device, and an inkjet printing method. The pixel print structure comprises a substrate, a first side wall and a second side wall located on the substrate, and an intermediate portion located between the first side wall and the second side wall, wherein the first side wall and the intermediate portion define a first area, and the second side wall and the intermediate portion define a second area.