Inkjet Head Electrode Voltage Control for QNED Element Orientation
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Solution Overview
Problem
The existing inkjet technology struggles with accurately arranging light-emitting elements during the manufacturing process of display devices, particularly in Quantum Nano Emitting Diode (QNED) displays, due to the shape specificity of the light-emitting elements, leading to potential electrode damage and short circuits.
Innovation Solution
An inkjet head with nozzles and pairs of electrodes that apply an electrode voltage to the light-emitting elements, including a first and second piezoelectric element, and a controller to independently control the electrode voltage, allowing for precise arrangement of light-emitting elements on a substrate with separate electrodes before and during the jetting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional inkjet technology is used to jet light-emitting elements, then the manufacturing process can be simplified, but the arrangement accuracy of light-emitting elements deteriorates due to shape specificity
Solution Approach 1:
The patent applies preliminary action by arranging light-emitting elements in a solution before jetting. The elements are pre-oriented and positioned in the ink solution using electrode voltages applied to the nozzle, ensuring they are properly arranged before being deposited on the substrate. This resolves the contradiction by maintaining manufacturing simplicity while achieving high arrangement accuracy through pre-arrangement in the fluid phase.
Solution Approach 2:
The patent utilizes parameter changes by controlling the orientation and arrangement of light-emitting elements through applied electrode voltages. By changing the electrical parameters (voltage magnitude and polarity) before and during jetting, the system can control the orientation of elongated light-emitting elements in the solution, ensuring they arrange perpendicular to the substrate surface. This allows conventional inkjet technology to achieve precise arrangement of shape-specific elements.
2Productivity
If light-emitting elements are jetted without preliminary arrangement, then the process speed can be maintained, but electrode damage and short circuits occur due to improper arrangement
Solution Approach 1:
The patent applies preliminary action by arranging light-emitting elements in a solution before jetting. The elements are pre-oriented and positioned in the ink solution using electrode voltages applied to the nozzle, ensuring they are properly arranged before being deposited on the substrate. This resolves the contradiction by maintaining manufacturing simplicity while achieving high arrangement accuracy through pre-arrangement in the fluid phase.
Solution Approach 2:
The patent segments the arrangement process into distinct phases: pre-arrangement in the ink solution using nozzle electrodes, and post-arrangement on the substrate using substrate electrodes. This segmentation allows the process to maintain high speed by performing arrangement operations in parallel with jetting, while ensuring reliability through multiple arrangement stages that prevent electrode damage and short circuits.
3Manufacturing precision
If electrode voltage is applied to arrange light-emitting elements, then arrangement accuracy improves, but the device complexity increases due to additional electrodes and control systems
Solution Approach 1:
The patent applies universality by making the electrodes serve multiple functions. The same electrodes in the nozzle structure are used both for arranging light-emitting elements in the solution before jetting and for controlling the jetting process itself. This multi-functionality reduces device complexity while maintaining high arrangement accuracy, as the electrodes are not additional components but rather the existing nozzle electrodes performing dual roles.
Solution Approach 2:
The patent merges the arrangement function with the existing jetting structure. By integrating the arrangement electrodes into the nozzle assembly and combining the arrangement and jetting operations into a single integrated process, the system achieves high arrangement accuracy without adding separate, complex arrangement mechanisms. The controller also merges control of both arrangement voltage and jetting timing into a unified control system.
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 enhances the arrangement accuracy and yield of light-emitting elements on the substrate, reducing the risk of electrode damage and improving the overall product yield of display devices by applying an electrode voltage to rotate and position the elements effectively.
Implementation Method 1
a first piezoelectric element which changes an internal pressure of a reservoir filled with the solution, an actuator which changes a piezoelectric element voltage applied to the first piezoelectric element to eject the solution through the ejecting hole
Implementation Method 2
pairs of electrodes which are provided around the ejecting hole to face each other and which apply an electrode voltage to the light-emitting element
Data Source
AI summary
Disclosed is an inkjet head and a method of ejecting an ink using the same. An inkjet head according to one embodiment of the present invention may include nozzles each including a ejecting hole through which a solution including a light-emitting element is ejected and pairs of electrodes which are provided around the ejecting holes to face each other and which apply an electrode voltage to the light-emitting element.