Ink-jet Printing Head Nozzle Sets for Film Thickness Control
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Solution Overview
Problem
Ink-jet printing for OLED display products faces challenges in accurately controlling the thickness of the film layer due to the uniformity of ink droplet volumes from nozzles, limiting the flexibility and accuracy of film thickness adjustment, which affects display performance.
Innovation Solution
The ink-jet printing head features nozzle sets with sub-nozzles of different specifications and sizes, arranged in columns with equal intervals, allowing for precise control of ink droplet volumes and flexible adjustment of film thickness through a calculation and control module that determines optimal combinations of sub-nozzles for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nozzles with the same specification and size are used, then the device structure is simple and easy to manufacture, but the film thickness cannot be flexibly adjusted and the printing accuracy deteriorates
Solution Approach 1:
The printing head is divided into multiple nozzle sets, each containing sub-nozzles with different specifications and sizes. This segmentation allows different nozzles to discharge different volumes of ink droplets, enabling flexible adjustment of film thickness while maintaining a relatively simple overall structure.
Solution Approach 2:
Different nozzle sets are assigned different local characteristics (different nozzle specifications and sizes) to discharge ink droplets of different volumes. This local differentiation enables precise control of ink volume for different printing positions, improving film thickness control accuracy without requiring complete redesign of the entire nozzle system.
2Device complexity
If uniform ink droplet volume from nozzles is used, then the nozzle structure is simple, but the total ink volume cannot be precisely controlled and film thickness accuracy deteriorates
Solution Approach 1:
Each nozzle set is segmented into multiple sub-nozzles with different discharge volumes. By selectively activating different nozzle sets or combinations of sub-nozzles, the total ink volume can be precisely controlled to match the specific requirements of different pixels, improving measurement precision while keeping the device configuration manageable.
Solution Approach 2:
The system dynamically selects and activates different nozzle sets or sub-nozzle combinations based on the required ink volume for each pixel. This dynamic adaptation allows the system to adjust the total ink volume discharged, improving precision without requiring a completely complex static configuration.
3Ease of operation
If the same volume ink droplet is discharged from all nozzles, then the printing process is simple to control, but the film layer thickness cannot be flexibly adjusted and display performance deteriorates
Solution Approach 1:
The printing head is segmented into multiple nozzle sets with different discharge volumes. This segmentation maintains operational simplicity by allowing independent control of each nozzle set while providing the versatility to adjust film thickness through selective activation of different nozzle combinations.
Solution Approach 2:
The printing head system achieves multi-functionality by incorporating nozzle sets with different specifications. Each nozzle set can be selectively activated to achieve different film thickness requirements, making the system adaptable to various printing needs while maintaining a unified control approach.
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 solution enables more accurate and flexible control of ink droplet volumes, significantly improving the accuracy of film thickness and enhancing the overall printing efficiency and display performance.
Implementation Method 1
The plurality of nozzle sets are used for ink-jet printing on pixels at different positions, respectively
Data Source
AI summary
Disclosed are an ink-jet printing head, an ink-jet printing method using the ink-jet printing head and an ink-jet printing device including the ink-jet printing head. The ink-jet printing head includes a chamber for accommodating ink and nozzle sets provided on a sidewall of the chamber where ink is sprayed. The nozzle sets are used for ink-jet printing on pixels at different positions, respectively. Each of nozzle sets includes sub-nozzles and the sub-nozzles in each nozzle set can spray different volumes of ink. In the printing head, by providing sub-nozzles having different ink spraying volumes in each nozzle set, ink droplets having desirable volumes can be sprayed from nozzle sets such that total volumes of ink droplets sprayed at different positions from nozzle sets could be more accurate. Therefore, a thickness of a film layer formed by ink-jet printing can be flexibly controlled and adjusted, while having a significantly improved accuracy.