Segmented Pixel Electrodes and Banks for Emitter Alignment
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Solution Overview
Problem
Existing display devices face challenges in achieving improved light output efficiency due to suboptimal alignment of light emitting elements, which affects the overall performance and efficiency of the display.
Innovation Solution
The display device incorporates a substrate with electrodes of varying widths and bank patterns to enhance the alignment of light emitting elements, ensuring precise placement and improved light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrode structures with uniform width are used, then manufacturing is simpler, but light emitting element alignment precision deteriorates
Solution Approach 1:
The electrode structure is segmented into multiple width regions along the first direction, with each region having a different width in the second direction. This segmentation allows different areas of the electrode to provide different alignment functions, improving the alignment precision of light emitting elements without requiring complete structural redesign.
Solution Approach 2:
Different regions of the electrode are designed with different local properties (widths), where the first width region provides one type of alignment guidance and the second width region provides another type. This local quality variation enables precise alignment control at specific locations without affecting the entire electrode structure.
2Manufacturing precision
If bank patterns with larger spacing are used, then light emitting element placement flexibility increases, but alignment precision deteriorates
Solution Approach 1:
The bank pattern is divided into multiple sub-bank patterns (first, second, third sub-bank patterns) with different spacing relationships. The first and second sub-bank patterns are spaced to align with light emitting elements of a first size, while the second and third sub-bank patterns are spaced to align with light emitting elements of a second size, enabling both precision and flexibility.
Solution Approach 2:
The bank pattern structure serves multiple functions: it provides alignment guidance for different sizes of light emitting elements, defines placement zones, and maintains spacing control. This multi-functionality allows the same bank pattern to support various light emitting element configurations without sacrificing alignment precision.
3Manufacturing precision
If electrodes with varying widths are implemented, then light emitting element alignment improves, but manufacturing complexity increases
Solution Approach 1:
The electrode width variation is segmented into distinct regions (first width region and second width region) that can be manufactured using standard photolithography techniques. Each region maintains a consistent width, making the fabrication process manageable despite the overall structural complexity.
Solution Approach 2:
The electrode width variations are designed and planned in advance during the patterning process, allowing manufacturing equipment to follow predetermined paths and parameters. This preliminary design of width variations enables precise alignment without requiring complex real-time adjustments during manufacturing.
Data Source
AI summary
A display device includes a substrate including a plurality of pixel areas; and a pixel provided in each of the pixel areas. The pixel may include a first electrode and a second electrode extending in a first direction on the substrate and spaced from each other in a second direction different from the first direction; a bank pattern between the substrate and the first electrode and between the substrate and the second electrode, and including at least two sub-bank patterns in a same column and spaced from each other; and a plurality of light emitting elements between the first and second electrodes. Here, each of the first and second electrodes may have at least two or more widths in the second direction along the first direction.