Sub-Pixel Bank Layout for Flat Ink and Emitter Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in improving the alignment degree of light emitting elements, which affects display quality due to uneven ink surface shapes during the inkjet process.
Innovation Solution
The use of a first bank with a specific shape acting as a wall in the inkjet process to adjust the surface shape of ink deposited into emission areas, ensuring a flat surface and preventing ink flow that could misalign light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink is jetted into emission areas during the inkjet process, then light emitting elements can be deposited, but the ink surface becomes uneven causing misalignment of light emitting elements
Solution Approach 1:
A bank structure is introduced as an intermediary component between the inkjet process and the emission area. The bank includes a first wall extending around a sub-area and a second wall adjacent to the emission area, spaced apart from the first wall. This intermediary structure controls ink flow and maintains a flat ink surface, preventing misalignment of light emitting elements while still allowing ink deposition.
Solution Approach 2:
The bank structure is formed in advance before the inkjet process. By pre-establishing the first wall and second wall with appropriate spacing, the system creates a controlled environment that prevents ink surface deformation during subsequent inkjet deposition, thereby maintaining alignment precision without requiring post-processing adjustments.
2Shape
If the bank walls are placed close together to confine ink, then ink surface flatness is maintained, but the emission area size is reduced
Solution Approach 1:
The bank structure implements local quality control by positioning walls at specific locations: the first wall surrounds the sub-area while the second wall is spaced apart adjacent to the emission area. This localized configuration provides ink confinement where needed (near the sub-area) while maintaining open space in the emission area, achieving both surface flatness and adequate emission area size.
Solution Approach 2:
The bank is segmented into multiple functional walls rather than using a single continuous barrier. The first wall and second wall are separated by a specific distance, creating distinct functional zones: one for ink confinement and another for emission. This segmentation allows simultaneous achievement of ink surface control and sufficient emission area.
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 approach enhances the alignment degree of light emitting elements, leading to improved display quality by maintaining a flat ink surface and preventing upward or downward collection of light emitting elements.
Implementation Method 1
a bank extending around a portion of the first emission area and the first sub-area... a first wall extending around the first sub-area; and a second wall adjacent to the first emission area
Implementation Method 2
The bank may include a hydrophobic material
Data Source
AI summary
A display device includes: a first sub-pixel having a first emission area and a first sub-area adjacent to each other in a first direction; and a bank extending around a portion of the first emission area and the first sub-area. The bank includes: a first wall extending around the first sub-area; and a second wall adjacent to the first emission area in a second direction crossing the first direction. The second wall and the first wall are spaced apart from each other in the first direction.