OLED Display Inkjet Printing Solvent Barrier Layer
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Solution Overview
Problem
The challenge in manufacturing OLED displays lies in the difficulty of achieving a whole solution process due to the mutual dissolution between the organic light emitting layer and the electron transport layer, which is caused by the use of organic solvent-dissolved materials, leading to inefficiencies in material utilization and increased costs.
Innovation Solution
A method involving the formation of a first solvent ink droplet with an organic light emitting material that is insoluble or slightly soluble in it, followed by the creation of an electron transport layer ink droplet with a second solvent, where both solvents are evaporated through vacuum drying and heating to form the electron transport layer, preventing mutual dissolution and allowing for a more efficient manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electron transport layer is formed using organic solvent-dissolved materials sprayed onto the organic light emitting layer, then the manufacturing process can be simplified, but the organic solvent dissolves the organic light emitting layer causing mutual dissolution between layers
Solution Approach 1:
A first solvent layer is introduced as an intermediary between the organic light emitting layer and the electron transport layer. This first solvent serves as a protective barrier that prevents direct contact and mutual dissolution between the organic light emitting material and the electron transport material, while still allowing the electron transport layer to be formed on top of it
Solution Approach 2:
The first solvent is applied in advance before forming the electron transport layer. This preliminary action creates a protective barrier that prevents the subsequent electron transport layer materials from dissolving the organic light emitting layer, solving the mutual dissolution problem before it can occur
2Manufacturing precision
If high vacuum thermal evaporation method is used to manufacture the organic light emitting layer, then the layer quality is maintained, but the equipment and process become complicated with high energy consumption and material waste
Solution Approach 1:
The patent replaces the high vacuum thermal evaporation method (a complex mechanical/physical vapor deposition process) with an inkjet printing method. This substitution uses a simpler liquid deposition technique where materials are dissolved in solvents and printed directly onto the substrate, eliminating the need for complex vacuum equipment while maintaining layer quality
Solution Approach 2:
The patent changes the state of the materials from vapor phase (in thermal evaporation) to liquid phase (in inkjet printing). By dissolving the organic light emitting material and electron transport material in appropriate solvents, the process transitions from high-vacuum vapor deposition to ambient or controlled atmosphere liquid printing, simplifying the equipment requirements
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 enables the formation of an OLED display device with improved material utilization and reduced costs by preventing the organic light emitting material from dissolving with the electron transport layer material, facilitating a simpler and more efficient manufacturing process.
Implementation Method 1
vacuum drying and heating to volatilize the first solvent and the second solvent sequentially
Implementation Method 2
vacuum drying and heating to volatilize the first solvent and the second solvent sequentially
Data Source
AI summary
An organic light emitting diode display device and a method of manufacturing thereof are provided. An electron transport layer ink droplet is formed on a surface of the first solvent ink droplet by forming a first solvent ink droplet on a surface of the organic light emitting layer. Thus, the first solvent constituting the first solvent ink droplet and the second solvent of the electron transport layer ink droplet are evaporated to form the electron transport layer.