Inkjet Ink Temperature Zoning for Uniform Bipolar Element Printing
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Solution Overview
Problem
Existing inkjet printing technologies face challenges in maintaining uniform distribution and reliability of light emitting elements due to variations in viscosity and precipitation speed of bipolar elements, which affect the quality and consistency of display devices.
Innovation Solution
An inkjet printing apparatus with temperature adjusting units to control the viscosity of ink compositions by adjusting temperature in different areas, ensuring uniform distribution and precipitation speed of bipolar elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the temperature of the composition for ink is not controlled, then the device complexity is reduced, but the viscosity of the composition for ink varies causing non-uniform distribution of bipolar elements
Solution Approach 1:
The temperature control system is segmented into multiple independent temperature adjusting devices, each controlling a specific region (ink storage, ink injection, print head) with its own temperature sensor and control parameters. This allows localized temperature management to maintain viscosity control without requiring a single complex centralized system.
Solution Approach 2:
The system changes the temperature parameter in different regions to control the viscosity of the composition for ink. By adjusting temperature, the viscosity is maintained within optimal ranges for each process stage, ensuring uniform distribution of bipolar elements while managing the complexity through parameter-based control rather than mechanical adjustments.
2Reliability
If the viscosity of the composition for ink is not controlled, then the process is simpler, but the precipitation speed of bipolar elements varies affecting light emission reliability
Solution Approach 1:
The system uses temperature as a controllable parameter to indirectly manage viscosity. Each region has temperature adjusting devices that maintain the composition for ink within specific temperature ranges, which in turn keeps viscosity within optimal ranges for preventing bipolar element precipitation and ensuring reliable light emission.
Solution Approach 2:
Temperature sensors in each region provide feedback to controllers that adjust the temperature adjusting devices accordingly. This closed-loop feedback system maintains viscosity control through temperature regulation, improving reliability while managing complexity through automated control rather than manual viscosity measurement and adjustment.
3Manufacturing precision
If temperature is adjusted in each area, then the precipitation speed of bipolar elements is controlled, but the device complexity increases
Solution Approach 1:
The temperature control system is divided into multiple independent modules, each responsible for a specific region (ink storage, ink injection, print head). Each module contains its own temperature sensor, controller, and adjusting device, allowing precipitation speed control in each region without requiring a single complex centralized control system.
Solution Approach 2:
The system controls precipitation speed by adjusting the temperature parameter in each region. Different temperature ranges are maintained in different areas to optimize viscosity and control bipolar element behavior at each stage of the process, achieving precise precipitation control through distributed parameter management.
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 apparatus ensures uniform distribution and improved light emission reliability of light emitting elements in display devices by controlling viscosity and precipitation speed, enhancing the quality of the manufacturing process.
Implementation Method 1
a temperature adjusting unit for controlling a temperature for each area to adjust a viscosity of the composition for ink
Data Source
AI summary
An inkjet printing apparatus includes: a print head device including an inkjet head to spray a composition for ink including a plurality of bipolar elements; an ink circulation device including an ink storage to store the composition for ink, and transfer the composition for ink to the print head device; an ink injection device to inject the composition for ink into the ink storage; and a temperature adjusting device to adjust a temperature of the composition for ink. The temperature adjusting device includes: a first temperature adjusting device to adjust a temperature to be included in a first reference temperature range; a second temperature adjusting device to adjust a temperature to be included in a second reference temperature range; and a third temperature adjusting device to adjust a temperature to be included in a third reference temperature range.