Color Conversion Substrate Bank Layer Ink Defect Control
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Solution Overview
Problem
Existing display devices face issues with appearance defects due to incorrectly deposited ink remaining on the bank layer of color conversion substrates, which can lead to visible defects and affect the quality of the displayed images.
Innovation Solution
A color conversion substrate design featuring a bank layer with specific geometrical configurations, including recesses and branching patterns, that directs incorrectly deposited ink to wells or areas where it can be accommodated, preventing it from remaining on the surface and causing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional bank layer structure is used, then the manufacturing process is simple, but incorrectly deposited ink remains on the surface causing appearance defects
Solution Approach 1:
The bank layer is segmented into multiple functional parts: a first bank part forming the main body, and second bank parts extending from the first bank part. This segmentation creates distinct zones that guide ink flow and prevent incorrect deposition on the surface, resolving the contradiction between manufacturing precision and structural complexity.
Solution Approach 2:
The bank layer structure extends in multiple directions (first direction and second direction intersecting at about 90 degrees), adding dimensional complexity to control ink flow paths. This multi-directional extension creates a three-dimensional guiding structure that prevents ink from remaining on the surface while maintaining manufacturability.
2Ease of manufacture
If the bank layer structure is simplified, then manufacturing is easier, but ink cannot be directed to designated areas effectively
Solution Approach 1:
The bank layer employs an asymmetric structure where the first bank part has a different configuration from the second bank parts. The first bank part includes a recessed region that asymmetrically guides ink flow, enabling effective ink direction while maintaining a relatively simple overall structure that is easy to manufacture.
3Productivity
If ink is allowed to flow freely, then deposition is faster, but incorrectly deposited ink remains causing defects
Solution Approach 1:
The second bank parts act as intermediary structures that intercept and redirect ink flow. These intermediate elements guide incorrectly deposited ink toward designated collection areas, allowing fast ink deposition while preventing defects by mediating the ink's final position.
Solution Approach 2:
The structure converts potentially harmful incorrect ink deposition into a beneficial outcome by guiding the excess ink toward designated areas. The second bank parts transform what would be defects into controlled ink placement, turning the harm of free-flowing ink into a benefit for productivity.
Data Source
AI summary
A color conversion substrate and a display device including the same are provided, the color conversion substrate including a substrate, color filter layers on the substrate, and arranged in a first direction, and in a second direction intersecting the first direction, a bank layer defining openings overlapping the color filter layers, and including a first bank part extending in the second direction, and second bank parts extending in the first direction from a side of the first bank part, and wavelength conversion layers in the openings of the bank layer, wherein the first bank part includes a recess recessed inwardly from a part of a second side opposite a first side on which the second bank parts are located.