Inkjet Head Inclined Surface and Ultrasonic Mixing for Particle Dispersion
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Solution Overview
Problem
Inkjet printing technologies face challenges in maintaining uniform particle distribution and preventing particle precipitation in the print head unit, leading to inconsistencies in inkjet printing, particularly affecting the luminance and display quality of display devices like OLEDs and LCDs.
Innovation Solution
The design of an inkjet printing apparatus with an inkjet head featuring a base portion with an inclined surface, varying nozzle diameters, and a rotation member within the inner flow path to mix and fluidize particles, along with a precipitation prevention member such as an ultrasonic vibrator or charging plate, ensures uniform ink discharge and prevents particle precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If particles are dispersed in ink for inkjet printing, then the ink can be discharged through nozzles, but particles precipitate in the print head unit causing non-uniform distribution
Solution Approach 1:
The patent applies ultrasonic vibration to the ink within the print head unit to prevent particle precipitation. The vibration energy keeps particles suspended in the ink, ensuring uniform distribution and consistent printing quality throughout operation.
Solution Approach 2:
The patent introduces a rotation member that rotates within the inner flow path to dynamically mix the ink and particles. This continuous motion prevents particle settling and maintains uniform particle distribution in the discharged ink.
2Device complexity
If particles remain stationary in the ink, then the ink structure is simple, but particles precipitate causing spots and luminance differences in display devices
Solution Approach 1:
Ultrasonic vibration is applied to the ink to prevent particle precipitation without requiring complex structural modifications. This simple yet effective approach maintains display quality uniformity by keeping particles evenly distributed.
Solution Approach 2:
The patent changes the physical state of particles by applying ultrasonic vibration and rotation, transforming stationary particles into dynamically suspended particles. This parameter change prevents precipitation and ensures uniform display quality.
3Productivity
If ink is discharged without particle mixing, then the discharge process is simple, but particle distribution becomes non-uniform affecting luminance
Solution Approach 1:
A rotation member is introduced to continuously mix particles in the ink while maintaining efficient discharge. The rotational motion ensures uniform particle distribution without significantly reducing printing productivity.
Solution Approach 2:
Ultrasonic vibration is applied to the ink to maintain particle suspension during the discharge process, ensuring uniform distribution is achieved without compromising printing speed or 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
This configuration maintains uniform particle distribution in the ink, reducing the occurrence of spots and luminance differences in display devices, thereby enhancing the reliability and quality of inkjet printing processes.
Implementation Method 1
a precipitation prevention member such as an ultrasonic vibrator or charging plate
Implementation Method 2
a rotation member within the inner flow path to mix and fluidize particles
Implementation Method 3
a precipitation prevention member such as an ultrasonic vibrator or charging plate
Data Source
AI summary
An inkjet apparatus comprises a stage, and an inkjet head positioned over the stage and including a plurality of nozzles through which ink including a plurality of particles is discharged. The inkjet head comprises a base portion constituting a main body of the inkjet head, a discharge portion adjacent to the base portion and including the plurality of nozzles, and an inner flow path between the base portion and the discharge portion and configured to accommodate the ink, wherein the base portion includes a first surface contacting the inner flow path, and at least a part of the first surface is at an incline.