OLED Display Substrate Hydrophilic Inducing Columns Ink Control
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Solution Overview
Problem
The ink jet printing method for manufacturing OLED display devices faces challenges in producing high-precision products due to limitations in precision and uniformity of film formation, particularly in high-resolution applications where small pixel sizes require precise control of ink volume and surface tension.
Innovation Solution
The introduction of hydrophilic and hydrophobic inducing columns on the pixel defining layer, with hydrophilic columns at the edges of the bottom wall and hydrophobic columns on the upper surface near the sidewalls, helps counteract ink surface tension and increase the effective ink volume, ensuring uniform film formation and improved light-emitting region efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ink jet printing method is used to manufacture OLED display devices, then productivity is improved and material cost is reduced, but manufacturing precision deteriorates due to difficulties in fabricating high precision products
Solution Approach 1:
The patent applies local quality by creating regions with different wettability characteristics within the pixel defining layer. Hydrophilic inducing columns are positioned at specific locations (edges of bottom wall) while hydrophobic inducing columns are placed at other locations (upper surface near sidewalls). This local differentiation of surface properties enables precise control over ink distribution and film formation in different areas, resolving the contradiction between high-speed printing and manufacturing precision.
2Measurement precision
If pixel size is reduced for high resolution applications, then display resolution is improved, but film formation uniformity deteriorates due to difficulties in controlling ink volume and surface tension
Solution Approach 1:
The patent changes the surface energy parameters of the pixel defining layer by introducing hydrophilic and hydrophobic inducing columns. This parameter modification allows precise control of ink wetting behavior and surface tension effects. The hydrophilic columns enhance ink adhesion and spreading at critical locations, while hydrophobic columns prevent excessive spreading, thereby maintaining film formation uniformity even when pixel size is reduced for high resolution displays.
3Area of stationary object
If ink volume is increased to improve light-emitting region efficiency, then effective area is improved, but film formation uniformity deteriorates due to surface tension effects
Solution Approach 1:
The hydrophilic and hydrophobic inducing columns act as intermediaries between the ink and the pixel defining layer. These columns mediate the interaction by providing controlled wettability surfaces that manage ink spreading and surface tension effects. The hydrophilic columns facilitate ink adhesion and uniform distribution, while hydrophobic columns limit excessive spreading, enabling increased ink volume to be deposited uniformly without compromising film formation 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 solution enhances the uniformity of film formation and increases the effective area of the light-emitting region, addressing the limitations of ink jet printing by maintaining a flat ink surface and supporting high-resolution product fabrication without compromising cathode evaporation processes.
Implementation Method 1
The introduction of hydrophilic and hydrophobic inducing columns on the pixel defining layer, with hydrophilic columns at the edges of the bottom wall and hydrophobic columns on the upper surface near the sidewalls, helps counteract ink surface tension
Implementation Method 2
The introduction of hydrophilic and hydrophobic inducing columns on the pixel defining layer, with hydrophilic columns at the edges of the bottom wall and hydrophobic columns on the upper surface near the sidewalls, helps counteract ink surface tension
Data Source
AI summary
The present disclosure discloses a display substrate and a manufacturing thereof. The display substrate comprises a base substrate, a pixel defining layer formed on the base substrate, wherein the pixel defining layer is provided with an opening region comprising a bottom wall and at least one sidewall, wherein in the opening region, an edge of the bottom wall is provided with at least one hydrophilic inducing column, wherein at least one of the hydrophilic inducing column has a hydrophilic surface.