Organic Thin Film Transistor Array Panel Inkjet Printing
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Solution Overview
Problem
Organic thin film transistors (OTFTs) are sensitive to process conditions and require improvements in characteristics for effective use in flexible display devices.
Innovation Solution
An organic thin film transistor array panel is designed with a substrate, data lines, insulating layers, electrodes, organic semiconductors, gate insulators, and gate electrodes, using materials like polythienylenevinylene and silicon nitride films, and a manufacturing method involving inkjet printing and indium tin oxide layer deposition to form source and pixel electrodes, ensuring protection and improved surface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If organic active layers are used in OTFTs, then low-temperature deposition and flexibility are achieved, but process sensitivity and device characteristics deteriorate
Solution Approach 1:
The patent changes the material parameters by using soluble organic semiconductor materials that can be processed in solution form rather than requiring vacuum deposition. This allows low-temperature processing while improving device characteristics through better material uniformity and reduced process sensitivity. The soluble materials enable controlled dissolution and deposition at lower temperatures with improved reliability.
Solution Approach 2:
The patent employs composite material structures including soluble organic semiconductor materials combined with appropriate solvents and processing additives. These composite formulations enable low-temperature deposition while achieving improved device characteristics through optimized material composition and enhanced processability.
2Ease of manufacture
If soluble organic semiconductor materials are used, then manufacturing ease is improved, but material stability may worsen
Solution Approach 1:
The patent uses solvents and processing additives as intermediary substances that enable the soluble organic semiconductor materials to be handled and processed easily in solution form. These intermediaries facilitate manufacturing while the solvent evaporation or removal process restores material stability in the final device structure.
Solution Approach 2:
The patent controls material stability by changing the physical state parameters - using soluble materials during processing and then removing the solvent to achieve stable solid-state device structures. This parameter change from solution to solid state maintains ease of manufacture while ensuring material stability.
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 enhances the stability and performance of OTFTs by protecting the organic semiconductors and improving surface characteristics, addressing sensitivity issues and enabling their effective use in flexible display devices.
Implementation Method 1
The organic semiconductors may be formed by inkjet printing
Implementation Method 2
The organic semiconductors may be formed by printing organic semiconductor material dissolved in a solvent, and removing the solvent
Implementation Method 3
depositing an indium tin oxide (ITO) layer at a room temperature
Data Source
AI summary
An organic thin film transistor array panel according to an embodiment of the present invention includes: a substrate; a data line disposed on the substrate; an insulating layer disposed on the data line and having a contact hole exposing the data line; a first electrode disposed on the insulating layer and connected to the data line through the contact hole; a second electrode disposed on the insulating layer; an organic semiconductor disposed on the first and the second electrodes; a gate insulator disposed on the organic semiconductor; and a gate electrode disposed on the gate insulator.