Inkjet Probe Layout for Uniform Electric Field Dipole Alignment
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Solution Overview
Problem
Current inkjet printing technologies face challenges in forming a uniform electric field on large-area substrates, leading to reduced alignment accuracy of dipoles in display devices, which results in display defects.
Innovation Solution
An inkjet printing apparatus with rotatable probe units that generate a uniform electric field using a frame with inkjet heads, first and second probes, and an electric field generation device, allowing for precise alignment of dipoles on a substrate by spraying ink with dipoles under controlled electric field conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet printing technology is used, then the printing process can be completed, but the electric field uniformity deteriorates on large-area substrates leading to reduced dipole alignment accuracy
Solution Approach 1:
The printing apparatus is divided into multiple independent probe units, each capable of generating its own electric field. This segmentation allows the system to cover large substrate areas while maintaining uniform electric field conditions across the entire surface, thereby preserving dipole alignment accuracy even on large-area substrates.
Solution Approach 2:
The probe units are designed to be movable and adjustable, allowing dynamic repositioning to match the substrate size and shape. This dynamic capability enables the system to maintain optimal electric field uniformity across varying substrate areas, preventing alignment accuracy degradation on large substrates.
2Area of stationary object
If the substrate area is increased, then the display device coverage is improved, but the electric field uniformity deteriorates resulting in display defects
Solution Approach 1:
By segmenting the electric field generation into multiple independent probe units, each unit can maintain stable and uniform electric field characteristics over its local coverage area. The combined effect of multiple probe units achieves uniform electric field distribution across the entire large-area substrate, preventing display defects.
Solution Approach 2:
The system can adjust parameters such as probe position, voltage magnitude, and electric field strength to compensate for substrate size variations. By dynamically changing these parameters, the system maintains stable electric field uniformity across different substrate areas, ensuring consistent dipole alignment and preventing display defects.
3Productivity
If non-uniform electric field is formed, then the printing process can proceed, but dipole alignment accuracy is reduced causing display defects
Solution Approach 1:
The system performs preliminary adjustment of probe positions and electric field parameters before the actual printing process. This preliminary action ensures that uniform electric fields are established across the substrate before dipoles are deposited, maintaining high alignment accuracy without sacrificing printing productivity.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor electric field uniformity and dipole alignment in real-time. Based on feedback information, the system automatically adjusts probe positions and voltage parameters to maintain optimal alignment accuracy throughout the printing process, ensuring high-quality results without reducing productivity.
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
The solution enables uniform electric field formation on large-area substrates, improving dipole alignment accuracy and reducing display defects by ensuring dipoles are sprayed in an aligned state with specific orientation directions.
Implementation Method 1
a first probe disposed on the frame, disposed at a side of the inkjet head, and providing a first voltage, and a second probe disposed on the frame, disposed at another side of the inkjet head, and providing a second voltage
Implementation Method 2
spraying an ink including dipoles onto a region where the electric field may be generated, and seating the dipoles on the target substrate
Data Source
AI summary
An inkjet printing apparatus comprises a frame, an inkjet head disposed on the frame, a first probe disposed on the frame, arranged at a side of the inkjet head, and providing a first voltage, and a second probe disposed on the frame, arranged at another side of the inkjet head, and providing a second voltage.