Display Pixel Bank Structure for Uniform Ink Ejection
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Solution Overview
Problem
Existing display devices face challenges in minimizing the non-ejected area of ink containing light emitting elements, leading to defects due to incomplete ink distribution during manufacturing.
Innovation Solution
The introduction of an intermediate bank with a lyophilic side surface and a liquid-repellent layer, integrated with a bank, helps control the ink distribution by creating a structure that allows for precise alignment and minimization of the non-ejected area, ensuring efficient ink usage and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bank structure is used, then the manufacturing process is simple, but the non-ejected area of ink increases leading to defects
Solution Approach 1:
The bank structure is segmented into a main bank and an intermediate bank, where the intermediate bank is positioned between adjacent pixels to specifically address ink non-ejection issues in certain regions while maintaining the conventional bank structure in other areas, thus reducing defects without overly complicating the overall manufacturing process
Solution Approach 2:
The intermediate bank is selectively introduced only in regions where ink non-ejection problems occur, rather than uniformly across the entire display device. This localized modification allows defect reduction in critical areas while keeping the rest of the structure simple and easy to manufacture
2Manufacturing precision
If the bank structure is modified to reduce non-ejected ink area, then ink distribution improves, but the manufacturing complexity increases
Solution Approach 1:
The bank structure is divided into a main bank for general ink containment and an intermediate bank for precise ink distribution control in specific regions, allowing improved ink uniformity without requiring complete redesign of the entire bank structure
Solution Approach 2:
The intermediate bank acts as an intermediary structure between the main bank and the pixel electrodes, mediating ink flow to ensure uniform distribution while maintaining a relatively simple manufacturing process that builds upon the conventional bank formation methodology
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 effectively reduces the non-ejected area of ink, preventing defects and enhancing the reliability of the display device by ensuring uniform ink distribution and alignment of light emitting elements.
Implementation Method 1
At least one of at least one surface of the bank and at least one surface of the intermediate bank may include a liquid-repellent layer that is liquid-repellent-treated
Implementation Method 2
each of a side surface of the bank and a side surface of the intermediate bank may not liquid-repellent-treated and may have a lyophilic characteristic
Data Source
AI summary
A display device includes: a substrate including a pixel area; and a pixel in the pixel area, the pixel including a first sub-light emitting area, a second sub-light emitting area, and a peripheral area surrounding the first and second sub-light emitting areas. The pixel may include: a first electrode, a second electrode, a third electrode, and a fourth electrode that are spaced from each other; a plurality of light emitting elements in the first and second sub-light emitting areas; a bank in the peripheral area and including a first opening corresponding to the first sub-light emitting area and a second opening corresponding to the second sub-light emitting area; and an intermediate bank between the first sub-light emitting area and the second sub-light emitting area and partially overlapping the second and third electrodes in a plan view.