Display Panel Inkjet Droplet Guidance With an Accelerating Electrode
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Solution Overview
Problem
Ink droplets ejected from inkjet apparatuses in display panel manufacturing often deviate from the vertical trajectory due to environmental factors, leading to inaccurate placement on the substrate and reduced image quality.
Innovation Solution
An inkjet apparatus with a charging unit and accelerating electrode system that uses electrical attraction to guide ink droplets accurately onto the substrate, comprising a charging body and electrode with opposite polarities to enhance ink acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet ejection is used without electrical field control, then the device structure remains simple, but ink droplets deviate from vertical trajectory due to environmental factors causing inaccurate placement
Solution Approach 1:
The patent introduces a charging unit and accelerating electrode as intermediary components between the inkjet nozzle and substrate. The charging unit imparts electrical charge to ink droplets, and the accelerating electrode creates an electrical field that guides the charged droplets along the vertical trajectory, thereby compensating for environmental disturbances without requiring complex mechanical control systems
Solution Approach 2:
The patent replaces potential mechanical trajectory control mechanisms with an electrical field-based control system. By using electrical charges and fields to guide ink droplets, the system achieves precise placement accuracy without complex mechanical positioning components, thus improving manufacturing precision while managing device complexity
2Manufacturing precision
If higher voltage is applied to accelerate ink droplets, then ink placement precision improves, but energy consumption increases
Solution Approach 1:
The charging unit applies electrical charge to ink droplets immediately after ejection from the nozzle, before the droplets travel through the air. This preliminary charging action enables the subsequent accelerating electrode to efficiently guide the droplets with lower voltage requirements, as charged droplets respond more effectively to electrical fields than uncharged ones would
Solution Approach 2:
The patent changes the physical parameter of the ink droplets by imparting electrical charge to them. This parameter change transforms the droplets from electrically neutral to charged particles, enabling control through electrical fields and reducing the energy voltage required for accurate trajectory control compared to mechanical or higher-voltage electrical methods
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 system significantly reduces positional errors of ink impact points, improving resolution and image quality by ensuring precise ink placement on the substrate.
Implementation Method 1
a charging electrode spaced apart from the charging body and connected to a voltage source. The charging body is charged with a polarity opposite to a polarity of the charging electrode by the charging electrode
Implementation Method 2
an accelerating electrode disposed on an opposite side of the nozzle unit with the substrate interposed therebetween, and accelerating the ink towards the substrate by electrical attraction
Data Source
AI summary
An inkjet apparatus for display manufacturing includes a nozzle unit having a discharge port for discharging ink to a substrate, a charging unit disposed on a side of the nozzle unit and charging the ink, and an accelerating electrode disposed on an opposite side of the nozzle unit with the substrate interposed therebetween, and accelerating the ink towards the substrate by electrical attraction.