Pixel Define Layer Hydrophobic Hydrophilic Coating Ink Containment
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Solution Overview
Problem
Existing pixel define layers in OLEDs face challenges in preventing ink from oozing between sub-pixels, leading to color mixture and potential cathode and anode short circuits, while also limiting light emitting efficiency and being unsuitable for large-scale production.
Innovation Solution
A pixel define layer with a base film layer having openings coated with hydrophobic and hydrophilic quantum dot materials on the substrate, featuring trapezoid or reversed trapezoid spacing base bodies, ensures ink containment and improved light emission efficiency by selecting suitable quantum dot materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer pixel define layer with trapezoid shape is used, then the manufacturing process is simple, but the organic layer spreads badly and causes cathode and anode short circuit
Solution Approach 1:
The pixel define layer is divided into two distinct layers: a lower layer with trapezoid shape for preventing short circuits, and an upper layer with inverted trapezoid shape for enabling proper organic layer spreading. This segmentation allows each layer to perform its specific function without compromise.
Solution Approach 2:
Different regions of the pixel define layer structure are assigned different shapes and functions: the lower layer uses trapezoid shape at the edges for electrical isolation, while the upper layer uses inverted trapezoid shape in the center for organic layer spreading control.
2Ease of operation
If a single-layer pixel define layer with inverted trapezoid shape is used, then the ink spreads well within the pixel, but the light emitting region of the cathode is reduced
Solution Approach 1:
The pixel define layer is segmented into two layers with different geometries: the lower layer maintains larger area for light emission, while the upper layer uses inverted trapezoid shape specifically for ink spreading control without reducing the overall light emitting region.
3Object-affected harmful factors
If the pixel define layer uses hydrophobic material with low surface energy, then the ink does not ooze outside the pixel, but the organic layer spreads badly at the edges
Solution Approach 1:
The pixel define layer uses different surface energy characteristics in different regions: the upper layer with inverted trapezoid shape has hydrophobic properties for ink containment, while the lower layer with trapezoid shape has hydrophilic properties for organic layer spreading at the edges.
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
The solution effectively prevents ink from oozing between sub-pixels, maintains light emitting region continuity, and enhances photochromic efficiency, making it suitable for large-size OLED production.
Implementation Method 1
An upper surface of each spacing base body is coated with a hydrophobic quantum dot material
Implementation Method 2
a side wall of each opening is coated with a hydrophilic quantum dot material
Data Source
AI summary
A pixel define layer and manufacturing method thereof and the related light emitting display are disclosed. The pixel define layer is arranged on a conductive layer of a substrate and comprises a base film layer. The base film layer has a plurality of openings each of which corresponds to a light-emitting region of a sub-pixel unit. A spacing base body is formed between the adjacent openings. An upper surface of each spacing base body is coated with a hydrophobic quantum dot material and a side wall of each opening is coated with a hydrophilic quantum dot material. With the pixel define layer and manufacturing method thereof and the related light emitting display according to embodiments of the disclosure, the ink within the sub-pixel would not ooze to the outside of the sub-pixel to result in color mixture between the adjacent sub-pixels, and the light emitting region within the pixel would not be decreased. By selecting suitable quantum dot materials, the photochromic efficiency can be improved. The process is simple and suitable for large size.