Pixel Bank Valley Structure for Light-Emitting Element Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in improving manufacturing efficiency, particularly in the design and structure of pixels and their components.
Innovation Solution
A pixel design that includes sub-pixels with emission areas and bank patterns, where the bank patterns overlap electrodes and have specific valley shapes, and a bank that surrounds the emission area, enhancing the alignment and supply of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bank patterns are designed to overlap electrodes with valley shapes, then alignment precision of light emitting elements is improved, but device complexity increases
Solution Approach 1:
The bank is divided into multiple bank patterns (first bank pattern, second bank pattern, etc.) with distinct valley structures. Each bank pattern is positioned at specific edge areas of the emission area, creating segmented alignment zones that guide light emitting elements to precise locations without requiring complex overall device design
Solution Approach 2:
The bank patterns are designed with valley shapes that extend in a second direction intersecting the first direction (horizontal arrangement). This creates a two-dimensional valley structure (first direction for bank pattern extension, second direction for valley slit extension) that provides enhanced alignment precision through multi-directional geometric constraints
2Productivity
If bank patterns with valleys are introduced to improve alignment, then manufacturing efficiency is improved, but ease of manufacture deteriorates
Solution Approach 1:
The bank patterns with valley shapes are formed in advance during the substrate preparation stage, before light emitting elements are supplied. These pre-formed valleys serve as alignment guides that automatically direct light emitting elements to correct positions during the supply process, eliminating the need for complex real-time alignment mechanisms and improving overall manufacturing efficiency
3Manufacturing precision
If the bank surrounds the entire emission area with openings for sub-emission areas, then alignment of light emitting elements is improved, but device complexity increases
Solution Approach 1:
The bank structure serves multiple functions simultaneously: it provides mechanical support for the substrate, creates defined emission areas through its opening structure, provides alignment guidance through valley shapes in bank patterns, and electrically isolates different regions. This multi-functionality reduces the need for separate components, thereby improving alignment precision without proportionally increasing device complexity
Data Source
AI summary
A display device according to an embodiment includes a pixel and a bank. The pixel includes sub-pixels and an emission area including sub-emission areas corresponding to the sub-pixels. The bank surrounds the emission area. The pixel includes electrodes disposed in each of the sub-emission areas, at least one light emitting element disposed in each of the sub-emission areas, and bank patterns disposed under the electrodes, the bank patterns overlapping a portion of the electrodes. The bank patterns include a first bank pattern including a first valley, the first bank pattern being disposed in a first edge area of the emission area in a first direction. The bank patterns include a second bank pattern including a second valley, the second bank pattern being disposed in a second edge area of the emission area in the first direction.