Multi-thickness Bank Pattern for Ink Overflow Prevention
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Solution Overview
Problem
Existing display devices face challenges in preventing the overflow of light-emitting element ink, which can lead to inefficiencies and defects in light-emitting element arrangement and operation.
Innovation Solution
A display device design featuring a bank pattern that overlaps with scan and power lines, defining openings for light-emitting element arrangement areas, and surrounding emission areas with a bank to prevent ink overflow and ensure proper alignment and operation of light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting element ink is applied without a bank pattern, then the manufacturing process is simpler, but ink overflow occurs leading to defects in light-emitting element arrangement
Solution Approach 1:
The bank pattern is segmented into multiple regions: a first bank pattern region with a first thickness and a second bank pattern region with a second thickness greater than the first thickness. This segmentation allows different portions of the bank pattern to serve different functions - the thicker second region provides enhanced containment to prevent ink overflow, while the thinner first region reduces structural complexity and material usage.
Solution Approach 2:
The bank pattern exhibits local quality variations through its multi-thickness structure. The second bank pattern region has a greater thickness specifically at locations where ink containment is most critical, while the first bank pattern region has a reduced thickness where full containment is less critical. This localized variation optimizes the balance between preventing ink overflow and minimizing overall device complexity.
2Reliability
If the bank pattern has uniform thickness, then the manufacturing process is simpler, but it cannot effectively prevent ink overflow in all areas
Solution Approach 1:
The bank pattern transitions from a static uniform thickness design to a dynamic multi-thickness design where the thickness varies spatially. The first bank pattern region has a first thickness and the second bank pattern region has a second thickness greater than the first thickness. This dynamic variation allows the structure to adapt to different functional requirements at different locations, providing enhanced ink overflow prevention where needed while maintaining manufacturability.
Solution Approach 2:
The bank pattern is extended into the thickness dimension to create a multi-level structure. By varying the thickness of the bank pattern across different regions (first thickness vs. second thickness), the design adds a dimensional variable that enhances ink containment capability without requiring complex lateral structures, thus maintaining relative ease of manufacture through vertical differentiation.
3Reliability
If the bank pattern completely overlaps with scan and power lines, then electrical stability is improved, but the device structure becomes more complex
Solution Approach 1:
The bank pattern serves multiple functions simultaneously: it acts as a physical barrier to prevent ink overflow, provides structural support, and enhances electrical stability through complete overlap with scan and power lines. This multi-functionality allows a single structural element to address multiple requirements, reducing the need for additional separate components and thereby limiting the increase in device complexity.
Solution Approach 2:
The bank pattern is merged with the scan and power line structures through complete overlapping. This merging integrates the electrical conductive elements with the mechanical containment structure, allowing the bank pattern to simultaneously provide ink containment and electrical stability functions. The integration reduces the number of separate components needed, balancing the improvement in electrical stability against the increase in structural complexity.
Data Source
AI summary
A display device comprises a first line extending in a first direction, a second line spaced apart from the first line in a second direction, sub-pixels including emission areas between the first line and the second line, light-emitting elements in light-emitting element arrangement areas in the emission areas, a bank pattern overlapping with the first line and the second line, and defining openings corresponding to the light-emitting element arrangement areas, and a bank surrounding the emission areas, and overlapping with the first line, the second line, and the bank pattern.