Wet Process Organic EL Layer for High Resolution Displays
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Solution Overview
Problem
The existing methods for manufacturing high-resolution display devices using organic electroluminescent (EL) technology face limitations in miniaturizing nozzle diameters for inkjet devices, hindering the formation of high-resolution organic compound layers.
Innovation Solution
The proposed solution involves a display device structure with a light-emitting element, including a first electrode, an organic compound layer, and a second electrode, along with transistors containing silicon and oxide semiconductors, where the organic compound layer is formed using a wet process to increase resolution without the need for miniaturized nozzle diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the nozzle diameter of an inkjet device is miniaturized to form high-resolution display devices, then the resolution is improved, but the nozzle diameter reaches a limitation in miniaturization
Solution Approach 1:
The patent replaces the mechanical inkjet deposition system with a wet process system that uses solution-based material deposition. This substitution eliminates the mechanical nozzle limitation while achieving high resolution through controlled solution application and drying processes, allowing for finer feature sizes without requiring proportionally smaller nozzles.
Solution Approach 2:
The patent changes the deposition parameter from nozzle diameter (mechanical constraint) to solution concentration and drying conditions (process-controlled parameters). By adjusting these parameters, the organic compound layer can be formed with high resolution regardless of nozzle size limitations, as the final layer thickness and pattern are controlled by chemical and physical process parameters rather than mechanical aperture dimensions.
2Manufacturing precision
If the organic compound layer is formed by a wet process, then the resolution is increased, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the manufacturing process into distinct stages: solution preparation, solution application (wet process), and drying/processing. This segmentation allows each stage to be optimized independently, with the wet process providing high resolution through controlled solution deposition while the drying stage consolidates the material into the desired final pattern, managing overall process complexity through systematic division of operations.
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 production of high-resolution display devices with reduced manufacturing costs and improved resolution, overcoming the limitations of traditional nozzle size constraints.
Implementation Method 1
a light-emitting element in which at least one organic compound layer is formed by a wet process
Data Source
AI summary
A display device with high resolution is provided. The display device includes a light-emitting element including a first electrode, an organic compound layer, and a second electrode; a first transistor electrically connected to the first electrode; a second transistor electrically connected to a gate of the first transistor; and an insulator provided to cover an end portion of the first electrode. The first transistor contains silicon in a channel formation region. The second transistor includes an oxide semiconductor in a channel formation region. An end portion of the organic compound layer is positioned in the opening portion of the insulator.