Organic EL Bank Cutouts for Residual Solution Removal
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Solution Overview
Problem
The existing methods for manufacturing organic electroluminescent display panels face challenges in removing residual solutions, particularly due to the three-dimensional structure of the bank surrounding pixel electrodes, which blocks the solution and makes it difficult to be effectively washed away.
Innovation Solution
A display device design that includes a substrate with a planarization layer, electrodes, and a bank formed in a grid pattern with protrusions and cutouts, allowing for easier removal of residual solutions through the formation of cutouts that align with the direction of airflow or centrifugal force during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bank with a three-dimensional structure is used to surround pixel electrodes, then pixel separation and individual control are improved, but residual solution removal becomes difficult
Solution Approach 1:
The bank structure is segmented by forming cutouts that divide the continuous bank into separate sections. These cutouts create pathways that allow residual solution to escape from the bank regions, solving the problem of solution entrapment while preserving the bank's pixel-separating function.
Solution Approach 2:
Material is extracted from the bank structure by forming cutouts. This extraction creates openings that enable residual solution to be removed from the display panel surface, addressing the manufacturing difficulty without compromising the bank's structural integrity for pixel separation.
2Reliability
If a three-dimensional bank structure is formed, then electrode separation is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The bank structure is divided into multiple sections through cutouts, which simplifies the manufacturing process by allowing residual solution to be removed more easily. This segmentation approach maintains electrode separation while reducing the complexity of subsequent cleaning operations.
Solution Approach 2:
The cutouts introduce a new dimensional feature to the bank structure, creating vertical pathways that facilitate solution removal. This dimensional change enables residual solution to escape without requiring complex multi-step cleaning processes.
Data Source
AI summary
According to an aspect, a display device includes: a substrate; a planarization layer provided on the substrate; a plurality of electrodes provided on the planarization layer and arrayed in a first direction and a second direction; a bank provided on the planarization layer and the electrodes and formed in a grid pattern so as to surround each of the electrodes; and a light-emitting layer provided on the electrodes. The bank protrudes with respect to the electrodes in a third direction orthogonal to the first direction and the second direction, and a cutout is formed in part of the bank.