OLED Printing Nozzle Head Segmentation for Dry Spot Reduction
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Solution Overview
Problem
Ink-jet printing for OLED displays faces challenges in reducing nozzle intervals to match high-resolution subpixel pitches, leading to difficulties in forming uniform patterns and increasing the risk of dry spots due to printing time differences between nozzles.
Innovation Solution
A printing apparatus with a nozzle head featuring linear nozzle units arranged in parallel, where adjacent nozzles from different units have a reduced interval, allowing for precise control of nozzle spacing and movement to minimize effective spacing and prevent dry spots, enabling uniform printing patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the interval between spray nozzles is reduced to match high-resolution subpixel pitches, then the manufacturing precision is improved, but the printing quality deteriorates due to increased dry spots
Solution Approach 1:
The nozzle head is divided into multiple linear nozzle units arranged in parallel, with each unit containing multiple spray nozzles. This segmentation allows independent control of each nozzle unit, enabling reduced interval between nozzles while maintaining printing quality through coordinated operation of multiple units.
Solution Approach 2:
The linear nozzle units are made movable relative to each other in the direction perpendicular to the first direction (width direction). This dynamic adjustment capability allows optimization of nozzle spacing and positioning during operation, preventing dry spots while maintaining high manufacturing precision.
2Manufacturing precision
If the effective spacing between adjacent spray nozzles is reduced, then the manufacturing precision is improved, but the reliability deteriorates due to printing time differences causing dry spots
Solution Approach 1:
By segmenting the nozzle system into multiple linear units, the patent achieves reduced effective spacing between adjacent nozzles from different units while maintaining uniform printing patterns through coordinated control of each segment.
Solution Approach 2:
The movable linear nozzle units can be dynamically positioned to compensate for printing time differences, ensuring uniform material deposition across all nozzles even when effective spacing is minimized.
3Manufacturing precision
If multiple linear nozzle units are used to reduce effective spacing, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The nozzle head is segmented into multiple linear nozzle units that can be independently controlled, achieving precise spacing control while the modular structure manages complexity through standardized repeated units.
Solution Approach 2:
Each linear nozzle unit serves multiple functions: it contains multiple spray nozzles, can be independently positioned, and works cooperatively with other units to achieve reduced effective spacing. This multi-functionality reduces overall system complexity.
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 reduces dry spots and improves printing quality by minimizing nozzle intervals, ensuring uniform patterns and reducing defective products, while maintaining efficient printing processes for high-resolution OLED displays.
Implementation Method 1
spraying a printing material on a corresponding substrate of a display device from a nozzle under pressure
Data Source
AI summary
A printing apparatus includes: a nozzle head including a nozzle head main body and a plurality of linear nozzle units for spraying a printing material, the linear nozzle units on one side of the nozzle head main body and elongated in parallel in a first direction; and a nozzle head driver connected to the nozzle head main body and configured to move the nozzle head in a second direction crossing the first direction. In such a printing apparatus, a dry spot due to a printing time difference may be reduced or prevented, a uniform printing pattern may be formed, printing quality may be improved, and defective products may be reduced. In addition, the effective spacing between separate spray nozzles may be reduced or minimized.