Display Inkjet Electrode Control for Uniform LED Pixel Deposition
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Solution Overview
Problem
Existing display device manufacturing technologies face challenges in uniformly distributing light emitting elements across pixels, leading to variations in emission efficiency and increased production costs.
Innovation Solution
An apparatus and method for manufacturing display devices that include a reservoir for ink containing light emitting elements and a solvent, an element-movement control module with a pipe part and an electrode part to control the movement of light emitting elements, and a nozzle part for ejecting ink. The element-movement control module operates in two modes: one allowing unrestricted movement and another restricting movement using an electric field, ensuring uniform distribution of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting elements are freely distributed in ink without movement control, then the manufacturing process is simple, but the distribution uniformity across pixels deteriorates
Solution Approach 1:
The patent replaces mechanical movement control methods with an electric field-based control system. Electrodes generate electric fields that interact with light emitting elements (which have electrical properties) to control their movement and distribution in the ink, achieving precise spatial control without complex mechanical mechanisms.
Solution Approach 2:
The patent controls the distribution of light emitting elements by changing electrical parameters (electric field strength, voltage, electrode configuration) rather than mechanical parameters. By adjusting these electrical parameters, the system can precisely control element movement and achieve uniform distribution across different pixel regions.
2Manufacturing precision
If light emitting elements are restricted in movement using electric field, then the distribution uniformity improves, but the device complexity increases
Solution Approach 1:
The patent divides the control system into multiple independent electrodes or electrode groups, each responsible for controlling light emitting elements in specific regions. This segmentation allows localized control and simplifies the overall system design by breaking down the complex control task into manageable regional units.
Solution Approach 2:
The electric field control system serves multiple functions: it guides light emitting elements to target regions, prevents aggregation in unwanted areas, and enables uniform distribution across pixels. This multi-functionality reduces the need for separate control mechanisms and simplifies the overall device architecture.
3Manufacturing precision
If electrodes are added to control element movement, then the distribution precision improves, but the production cost increases
Solution Approach 1:
The patent integrates the electrode control system directly into the inkjet printing process, utilizing the existing fluid delivery infrastructure. The electrodes are positioned to work in conjunction with the ink ejection mechanism, allowing element control during the normal printing operation without requiring separate control systems or additional production steps.
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 achieves uniform distribution of light emitting elements across pixels, reducing production costs and enhancing emission efficiency by precisely controlling the movement of light emitting elements during the manufacturing process.
Implementation Method 1
the electrode part may form an electric field, and the movement of the light emitting element in the ink channel may be restricted at least in an area corresponding to a position at which the electrode part is disposed
Implementation Method 2
a nozzle part that ejects the ink outward
Data Source
AI summary
An apparatus of manufacturing a display device may include a reservoir that receives ink including a light emitting element and a solvent; an element-movement control module including a pipe part defining an ink channel fluidly connected to the reservoir, and an electrode part disposed on a surface of the pipe part; and a nozzle part that ejects the ink outward. The element-movement control module may operate in a first mode or a second mode. In case that the element-movement control module operates in the first mode, movement of the light emitting element may be unrestricted. In case that the element-movement control module operates in the second mode, the electrode part may form an electric field, and the movement of the light emitting element in the ink channel may be restricted at least in an area corresponding to a position at which the electrode part is disposed.