Rotating Droplet Discharge Head for Color Filter Uniformity
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Solution Overview
Problem
Existing methods for discharging liquid bodies in the manufacturing of color filters and organic EL devices face challenges in achieving uniform thickness of thin films due to uneven nozzle alignment and varying discharge properties, leading to image quality issues and reduced productivity.
Innovation Solution
A method involving the use of multiple nozzles arranged in a linear manner, where the substrate and droplet discharge heads are moved in orthogonal directions to allow more nozzles to face different-sized pixel regions, adjusting the nozzle pitch and angle to ensure even distribution of liquid bodies across the substrate, thereby reducing unevenness in film thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel regions with different arrangement directions are formed on a substrate, then substrate utilization efficiency is improved, but nozzle alignment uniformity deteriorates
Solution Approach 1:
The invention makes the nozzle line orientation adjustable rather than fixed. The droplet discharge head can rotate to align the nozzle line with the long side direction of different pixel region types (first type or second type), enabling dynamic adaptation to varying substrate layouts while maintaining uniform discharge properties across all pixel regions
Solution Approach 2:
The invention changes the orientation parameter of the nozzle line by rotating the droplet discharge head. By adjusting the rotational angle of the droplet discharge head, the nozzle line can be aligned with either the long side direction of first type pixel regions or the long side direction of second type pixel regions, thereby adapting to different pixel region arrangements on the substrate
2Device complexity
If nozzles are arranged in a fixed linear manner, then device simplicity is maintained, but discharge uniformity across varied pixel regions deteriorates
Solution Approach 1:
The invention transforms the fixed nozzle arrangement into a dynamically adjustable one by enabling rotation of the droplet discharge head. The nozzle line remains linear but its orientation can be changed to match the long side direction of different pixel region types, ensuring uniform discharge properties without complicating the basic linear nozzle structure
Solution Approach 2:
The droplet discharge head is designed to serve multiple functions: it can discharge liquid bodies to both first type pixel regions and second type pixel regions by rotating to appropriate orientations. This multi-functionality allows a single nozzle configuration to handle varied pixel region layouts uniformly
Data Source
AI summary
A method for discharging a liquid body includes: discharging the liquid body to a discharged region from a plurality of nozzles while a plurality of droplet discharge heads having a nozzle line having the plurality of nozzles that discharge the liquid body as droplets and are arranged in a linear manner, and a substrate including a plurality of discharged regions having a nearly rectangular shape are relatively moved in a main scan direction that is nearly orthogonal to an arrangement direction of the droplet discharge heads. In the method, the plurality of discharged regions are composed of a first discharged region and a second discharged region. The first discharged region is disposed on the substrate to set a long side thereof along a certain direction, and the second discharged region has a smaller area than the first discharged region and is disposed to set a long side thereof nearly orthogonal to the long side of the first discharged region. Further, the first discharged region is disposed to set the long side thereof along the main scan direction in the discharging.