Acoustic Wave Gas Jet Printing for OLED Pixel Definition
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Solution Overview
Problem
OLED display devices face color mixing and performance degradation due to the diffusibility of gaseous luminescent materials during the jet printing process, leading to inaccurate film formation in adjacent pixel areas.
Innovation Solution
An array substrate with interdigital electrodes on a piezoelectric substrate is designed to create an acoustic surface standing wave, where the nodal point corresponds to the pixel defining layer and the antinodal point corresponds to the opening region, concentrating the gaseous luminescent material within the opening region and preventing diffusion into adjacent areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas ejection method is used to form luminescent film, then manufacturing efficiency is improved, but film formation precision deteriorates due to material diffusion
Solution Approach 1:
The patent applies acoustic wave vibration to the substrate to create periodic pressure variations during gas ejection. The interdigital transducer generates surface acoustic waves that produce alternating high and low pressure regions, utilizing mechanical vibration to control material deposition patterns and prevent diffusion while maintaining high manufacturing efficiency.
Solution Approach 2:
The patent changes the pressure parameter dynamically during the film formation process by applying acoustic waves. The pressure on the substrate surface is modulated between high and low states through acoustic frequency control, allowing precise spatial control of luminescent material deposition while maintaining gas ejection efficiency.
2Device complexity
If gas ejection is performed without acoustic wave control, then process simplicity is maintained, but material diffusion to adjacent regions occurs
Solution Approach 1:
Acoustic wave vibration is introduced to create localized pressure zones that confine the gaseous luminescent material during ejection. The mechanical vibration generates alternating pressure fields that prevent lateral diffusion while maintaining the simplicity of the gas ejection process, with the acoustic field providing the necessary confinement.
Solution Approach 2:
The acoustic wave field acts as an intermediary between the gas ejection source and the substrate. This intermediate acoustic field mediates the deposition process by creating pressure gradients that guide material flow, preventing direct diffusion to adjacent regions while maintaining process simplicity.
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 configuration enhances the pressure difference between nodal and antinodal points, ensuring the gaseous luminescent material is gathered in the intended region, preventing color mixing and improving display device performance by maintaining precise film formation.
Implementation Method 1
fitting on the piezoelectric substrate to form an acoustic surface standing wave including an antinodal point and a nodal point
Implementation Method 2
enhances the pressure difference between nodal and antinodal points, ensuring the gaseous luminescent material is gathered in the intended region
Implementation Method 3
spray it into a pixel definition area of a display device through a micro-jet to condense into a solid film when the gaseous material comes into contact with a cold substrate
Data Source
AI summary
The present disclosure relates to an array substrate and a method for manufacturing the same, a display panel, and a display equipment. The array substrate includes a piezoelectric substrate, a pixel defining layer disposed on the piezoelectric substrate and formed with an opening region, and interdigital electrodes disposed oppositely at two sides of the pixel defining layer on the piezoelectric substrate and fitted on the piezoelectric substrate to form an acoustic surface standing wave including an antinodal point and a nodal point. The position of the antinodal point corresponds to the position of the opening region while the position of the nodal point corresponds to the position of the pixel defining layer. In the array substrate provided by the present disclosure, when a light emitting unit is formed in the opening region by a gas jet printing equipment, a gas material can be prevented from diffusing into adjacent opening regions.