Bank Layer Guide Portion for Display Ink Overflow Control
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Solution Overview
Problem
Display devices face issues with ink overflowing from light-emitting elements, leading to bright spots, dark spots, and film delamination due to inadequate separation and containment mechanisms.
Innovation Solution
The implementation of a display device design featuring a bank layer with a bank guide portion and a dam portion to guide and contain ink within specific areas, preventing overflow into separation regions and ensuring proper ink distribution and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bank layer is used to separate emission areas, then ink overflow is prevented, but the structure becomes more complex
Solution Approach 1:
The bank layer is divided into two functional portions: a bank guide portion with a first cross-sectional shape that guides ink flow, and a bank storage portion with a second cross-sectional shape that stores excess ink. This segmentation allows each portion to perform its specific function optimally while working together to contain ink within emission areas, preventing overflow without requiring entirely separate structures.
Solution Approach 2:
Different portions of the bank layer are given different cross-sectional shapes tailored to their specific functions. The bank guide portion has a shape optimized for directing ink flow along the emission area boundaries, while the bank storage portion has a shape optimized for containing and storing excess ink. This local differentiation of structure and function resolves the contradiction by making the overall structure more efficient rather than simply adding complexity.
2Ease of manufacture
If the bank layer shape is uniform, then manufacturing is simpler, but ink distribution and containment are inadequate
Solution Approach 1:
The bank layer employs different cross-sectional shapes in different portions to achieve precise ink distribution control. The bank guide portion's first shape and the bank storage portion's second shape are specifically designed to control ink flow and containment at different locations, providing the manufacturing precision needed for proper ink distribution while maintaining a relatively simple overall fabrication process.
Solution Approach 2:
By segmenting the bank layer into distinct portions with different shapes, the design achieves precise ink distribution control through functional specialization. Each segment is optimized for its specific role in the ink containment and distribution process, allowing for better manufacturing precision without requiring complete redesign of the entire bank layer structure.
Data Source
AI summary
A display device includes a plurality of sub-pixels including emission areas, and a subsidiary area, a via layer disposed on a substrate, a bank layer disposed on the via layer and separating emission areas of the plurality of sub-pixels from one another, a dam portion disposed between the bank layer and adjacent bank layer and separating a bank storage portion from the subsidiary area, a first electrode and a second electrode disposed on the via layer in one of the emission areas and spaced apart from each other, and a light-emitting element disposed on the first electrode and the second electrode. The bank layer includes a bank guide portion disposed between the one of the emission areas and the bank storage portion, and a shape of the bank guide portion is different from a shape of a rest of the bank layer in a cross-sectional view.