Inkjet Printing Device with Optical Sensing for Uniform Bipolar Element Dispersion
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Solution Overview
Problem
Inkjet printing technologies face challenges in maintaining a uniform number of bipolar elements per unit droplet, affecting the reliability of light emitting elements in display devices.
Innovation Solution
An inkjet printing device with a sensing part that measures the number of bipolar elements using light scattering, allowing for real-time feedback to control the dispersion, ensuring a consistent number of elements per droplet is ejected and aligned on a target substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet printing is used without sensing feedback, then the printing process is simple and fast, but the number of bipolar elements per droplet is non-uniform
Solution Approach 1:
The patent implements a feedback mechanism where a sensing part measures the number of bipolar elements in each ink droplet after ejection. The measurement result is fed back to control the ink circulation part, which adjusts the dispersion of bipolar elements in the ink before it enters the inkjet head again. This closed-loop feedback system ensures uniform distribution of bipolar elements per droplet while maintaining printing precision.
2Stability of the object's composition
If ink circulation without sensing is used, then the system is simpler and faster, but the dispersion of bipolar elements becomes non-uniform
Solution Approach 1:
The sensing part measures the number of bipolar elements in the ink after ejection and feeds this information back to the ink circulation part. The ink circulation part uses this feedback to adjust and maintain uniform dispersion of bipolar elements in the ink, ensuring stable composition throughout the circulation process.
Solution Approach 2:
The patent replaces complex mechanical dispersion control mechanisms with an optical sensing and feedback control system. The sensing part uses light scattering to detect bipolar element count, and the feedback control automatically adjusts ink circulation parameters, substituting mechanical complexity with intelligent control.
3Manufacturing precision
If real-time sensing of bipolar elements is implemented, then uniformity of elements per droplet is improved, but the measurement and control system becomes more complex
Solution Approach 1:
The patent uses optical sensing instead of direct mechanical or electrical counting methods to measure the number of bipolar elements. The sensing part employs light scattering principles to detect and count bipolar elements in each droplet, providing a non-contact, efficient measurement approach that simplifies the detection process while maintaining high precision.
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 approach enhances the uniformity and reliability of light emitting elements on display devices by maintaining a consistent number of bipolar elements per unit area, improving emission performance.
Implementation Method 1
at least part of the light emitted to the ink is scattered by the bipolar elements, and the light receiving part may measure the number of the bipolar elements by receiving the light emitted from the light emitting part and the scattered light
Data Source
AI summary
An inkjet printing device includes a stage; an inkjet head disposed above the stage and comprising nozzles through which ink is discharged, the ink including bipolar elements extending in a direction; an ink circulation part which supplies the ink to the inkjet head, and to which the ink remaining after being discharged from the inkjet head is supplied; and at least one sensing part disposed between the inkjet head and the ink circulation part and sensing a number of the bipolar elements that are discharged through the nozzles.